You still will not get the airy disks, yes a stop will help but you still have tube currents to deal with. A refractor will out perform a reflector on double stars. Have you ever looked through the big AstroPhysics Refractors? Just the opinion of a #$*#$**##.
On the other hand, if you make an offset mask for a large reflector, you
now have a refractor buster. Cost is free if you have some black poster board laying around.
Mat
-----Original Message----- From: utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmission.com [mailto:utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmissio n.com] On Behalf Of erikhansen@thebluezone.net Sent: Tuesday, June 21, 2011 4:36 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Celestron Edge HD
Of course any scope with a central obstruction will have problems on the planets, only a refractor yields those airy disks.
I just checked Cloudy nights and it seems Celestron is having some quality
control problems. Here is the review.
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4644922 /page/0/view/collapsed/sb/5/o/all/fpart/1
Debbie
On Tue, Jun 21, 2011 at 10:43 AM, Steve Fisher <iotacass1@hotmail.com>wrote:
Debbie: Bill Cowles and I had a chance to observe through several different size HD's at RTMC in 2009. This was the last RTMC that Bill and I attended and the first roll out of the Celestron HD series. I honestly don't think the HD would be significantly different than another C-8 or larger except for imaging. The HD was designed for a flatter field across the
entire
field much the same as the Meade ACF although a different path to get there. If you are thinking about imaging then the HD would be an improvement with the flatter field and the vented OTA but if you are just using for visual use, not so much in my opinion. That is of course "just my opinion".Steve
Date: Tue, 21 Jun 2011 09:33:42 -0600 From: astrodeb@beyondbb.com To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Celestron Edge HD
Has anybody looked through one of these? I wondered how doubles would look through this telescope? I think globulars would look good. It seems like 8 inches is the minimum aperature to resolve globulars. Any thoughts about this scope?
Debbie _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
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Eric: You're wrong about the optics here. The Airy disk and diffraction rings are a result of the small aperture of the refractor not the lack of central obstruction or tube currents. I have seen beautiful Airy disk and diffraction rings in a 90mm Mak that Siegfried brought to SPOC once. The Mak has a huge central obstruction and is famous for internal tube currents. The airy disk and diffraction rings disappear in a large aperture reflector because they are so much smaller that they get lost in the seeing. It's an old myth that has persisted for decades. You can split stars with a reflector just fine. DT From: "erikhansen@thebluezone.net" <erikhansen@thebluezone.net> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, June 21, 2011 3:04 PM Subject: Re: [Utah-astronomy] Celestron Edge HD
You still will not get the airy disks, yes a stop will help but you still have tube currents to deal with. A refractor will out perform a reflector on double stars. Have you ever looked through the big AstroPhysics Refractors? Just the opinion of a #$*#$**##.
On the other hand, if you make an offset mask for a large reflector, you
now have a refractor buster. Cost is free if you have some black poster board laying around.
Mat
-----Original Message----- From: utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmission.com [mailto:utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmissio n.com] On Behalf Of erikhansen@thebluezone.net Sent: Tuesday, June 21, 2011 4:36 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Celestron Edge HD
Of course any scope with a central obstruction will have problems on the planets, only a refractor yields those airy disks.
I just checked Cloudy nights and it seems Celestron is having some quality
control problems. Here is the review.
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4644922 /page/0/view/collapsed/sb/5/o/all/fpart/1
Debbie
On Tue, Jun 21, 2011 at 10:43 AM, Steve Fisher <iotacass1@hotmail.com>wrote:
Debbie: Bill Cowles and I had a chance to observe through several different size HD's at RTMC in 2009. This was the last RTMC that Bill and I attended and the first roll out of the Celestron HD series. I honestly don't think the HD would be significantly different than another C-8 or larger except for imaging. The HD was designed for a flatter field across the
entire
field much the same as the Meade ACF although a different path to get there. If you are thinking about imaging then the HD would be an improvement with the flatter field and the vented OTA but if you are just using for visual use, not so much in my opinion. That is of course "just my opinion".Steve > Date: Tue, 21 Jun 2011 09:33:42 -0600
From: astrodeb@beyondbb.com To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Celestron Edge HD > Has anybody looked through one of these? I wondered how doubles would look through this telescope? I think globulars would look good. It seems like 8 inches is the minimum aperature to resolve globulars. Any thoughts about this scope?
Debbie _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
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Isn't true that with a 8-10 inch reflector you can crank up the power more, hence get a wider separation of the double star? Of course, seeing is the big factor in splitting double stars. This time of year, I have to go up into the mountains to get decent seeing. Debbie On Tue, Jun 21, 2011 at 3:55 PM, daniel turner <outwest112@yahoo.com> wrote:
Eric:
You're wrong about the optics here. The Airy disk and diffraction rings are a result of the small aperture of the refractor not the lack of central obstruction or tube currents. I have seen beautiful Airy disk and diffraction rings in a 90mm Mak that Siegfried brought to SPOC once. The Mak has a huge central obstruction and is famous for internal tube currents. The airy disk and diffraction rings disappear in a large aperture reflector because they are so much smaller that they get lost in the seeing. It's an old myth that has persisted for decades. You can split stars with a reflector just fine.
DT
From: "erikhansen@thebluezone.net" <erikhansen@thebluezone.net> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, June 21, 2011 3:04 PM Subject: Re: [Utah-astronomy] Celestron Edge HD
You still will not get the airy disks, yes a stop will help but you still have tube currents to deal with. A refractor will out perform a reflector on double stars. Have you ever looked through the big AstroPhysics Refractors? Just the opinion of a #$*#$**##.
On the other hand, if you make an offset mask for a large reflector, you
now have a refractor buster. Cost is free if you have some black poster board laying around.
Mat
-----Original Message----- From: utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmission.com [mailto:utah-astronomy-bounces+mat.hutchings=siemens.com@mailman.xmissio n.com] On Behalf Of erikhansen@thebluezone.net Sent: Tuesday, June 21, 2011 4:36 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Celestron Edge HD
Of course any scope with a central obstruction will have problems on the planets, only a refractor yields those airy disks.
I just checked Cloudy nights and it seems Celestron is having some quality
control problems. Here is the review.
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4644922 /page/0/view/collapsed/sb/5/o/all/fpart/1
Debbie
On Tue, Jun 21, 2011 at 10:43 AM, Steve Fisher <iotacass1@hotmail.com>wrote:
Debbie: Bill Cowles and I had a chance to observe through several different size HD's at RTMC in 2009. This was the last RTMC that Bill and I attended and the first roll out of the Celestron HD series. I honestly don't think the HD would be significantly different than another C-8 or larger except for imaging. The HD was designed for a flatter field across the
entire
field much the same as the Meade ACF although a different path to get there. If you are thinking about imaging then the HD would be an improvement with the flatter field and the vented OTA but if you are just using for visual use, not so much in my opinion. That is of course "just my opinion".Steve
Date: Tue, 21 Jun 2011 09:33:42 -0600 From: astrodeb@beyondbb.com To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Celestron Edge HD
Has anybody looked through one of these? I wondered how doubles would look through this telescope? I think globulars would look good. It seems like 8 inches is the minimum aperature to resolve globulars. Any thoughts about this scope?
Debbie _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
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*neutronman *from cloudynights posted this : http://vimeo.com/25424644 Amazing video. -david
http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html 24 June 2011Breaking News Alert! O! NEOs to Rock, Rattle, and Roll 2011MD VERY Close Approach 27JUN2011 Alert! NEOs Rock, Rattle, and Roll! Green Meteor Fireballs and Maybe a Bolide or more! (Issued 24JUN2011 1:30 am Tokyo by LunarMeteorite*Hunter) This is an alert; we will have a very close visitor, (2011 MD) 2011-Jun-27 0.0001 0.05LD 8.0 m - 18 m 27.6 6.77 within ~19,200km or 12,000 miles (about the distance from New Zealand to Great Britian - NOT far by space standards) on 27JUN2011! I expect we will see many large fireball events just prior to from today until July 5! Have your pointed and ready to capture and IF you have time get outside and observe and you might get lucky! Please help get the word out by posting a link on Facebook, Twitter, MySpace, YouTube, news outlets and forums, to my site: http://lunarmeteoritehunters.blogspot.com/ TokyoLunarMeteorite*Hunter, Tokyo, Japan Thank you! IF you do see a big meteor please email me at LunarMeteoriteHunter@gmail.com (see below in red print as to the information we need. Thank you! O! NEO O!; UPCOMING CLOSE APPROACHES TO EARTH 1 AU = ~150 million kilometers 1 LD = Lunar Distance = ~384,000 kilometers Object Name Close Approach Date Miss Distance (AU) Miss Distance (LD) Estimated Diameter* H (mag) Relative Velocity (km/s) 65909 (1998 FH12) 2011-Jun-23 0.1379 53.7 400 m - 900 m 19.1 20.98 (2007 CS5) 2011-Jun-23 0.1167 45.4 33 m - 75 m 24.5 8.48 (2009 WW104) 2011-Jun-24 0.0399 15.5 80 m - 180 m 22.6 12.14 (2011 KW15) 2011-Jun-26 0.1072 41.7 310 m - 690 m 19.7 21.67 (2008 WM64) 2011-Jun-26 0.1015 39.5 200 m - 440 m 20.6 17.30 3988 (1986 LA) 2011-Jun-27 0.1853 72.1 700 m 18.2 7.93 (2011 MD) 2011-Jun-27 0.0001 0.05 8.0 m - 18 m 27.6 6.77 (2008 CY21) 2011-Jun-27 0.1505 58.6 31 m - 68 m 24.7 9.53 (2008 YC3) 2011-Jun-29 0.1721 67.0 23 m - 51 m 25.4 8.78 (2011 MC) 2011-Jun-29 0.0735 28.6 130 m - 300 m 21.5 17.19 (2010 NY65) 2011-Jun-30 0.1448 56.3 120 m - 270 m 21.7 16.27 (2002 EM7) 2011-Jul-01 0.0284 11.0 35 m - 79 m 24.4 10.6 Source: http://neo.jpl.nasa.gov/ca/ NASA/JPL/CalTech Ephemeris http://ssd.jpl.nasa.gov/horizons.cgi?CGISESSID=ee9b33fb2cb6f942721f48316c65a 709#results Date and Time of event? Location name (town,city) where you were when saw the meteor? Start and Stop location in sky? Direction of movement? Duration of Event (seconds)? Brightness ( in comparison with Venus, Moon, Sun) color, sounds? Photos? Videos? please email LunarMeteoriteHunter@gmail.com Your reports make it possible for all to check what they saw as well. Thank you! 2011 Year of Meteors! http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html
http://neo.jpl.nasa.gov/news/news172.html Bend it Like Beckham! Small Asteroid to Whip Past Earth on June 27, 2011 Don Yeomans & Paul Chodas NASA/JPL Near-Earth Object Program Office June 23, 2011 Trajectory of 2011 MD projected onto the Earth's orbital plane. Note from this viewing angle, the asteroid passes underneath the Earth. Trajectory of 2011 MD from the general direction of the Sun. Near-Earth asteroid 2011 MD will pass only 12,000 kilometers (7,500 miles) above the Earth's surface on Monday June 27 at about 9:30 EDT. The asteroid was discovered by the LINEAR near-Earth object discovery team observing from Socorro, New Mexico. The diagram on the left shows the trajectory of 2011 MD projected onto the Earth's orbital plane over a four-day interval. The diagram on the left gives another view from the general direction of the Sun that indicates that 2011 MD will reach its closest Earth approach point in extreme southern latitudes (in fact over the southern Atlantic Ocean). This small asteroid, only 5-20 meters in diameter, is in a very Earth-like orbit about the Sun, but an orbital analysis indicates there is no chance it will actually strike Earth on Monday. The incoming trajectory leg passes several thousand kilometers outside the geosynchronous ring of satellites and the outgoing leg passes well inside the ring. One would expect an object of this size to come this close to Earth about every 6 years on average. For a brief time, it will be bright enough to be seen even with a modest-sized telescope. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Barrett Sent: Thursday, June 23, 2011 10:58 AM To: 'Utah Astronomy' Subject: [Utah-astronomy] NEO ALERT!! Very Close! Importance: High http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html 24 June 2011Breaking News Alert! O! NEOs to Rock, Rattle, and Roll 2011MD VERY Close Approach 27JUN2011 Alert! NEOs Rock, Rattle, and Roll! Green Meteor Fireballs and Maybe a Bolide or more! (Issued 24JUN2011 1:30 am Tokyo by LunarMeteorite*Hunter) This is an alert; we will have a very close visitor, (2011 MD) 2011-Jun-27 0.0001 0.05LD 8.0 m - 18 m 27.6 6.77 within ~19,200km or 12,000 miles (about the distance from New Zealand to Great Britian - NOT far by space standards) on 27JUN2011! I expect we will see many large fireball events just prior to from today until July 5! Have your pointed and ready to capture and IF you have time get outside and observe and you might get lucky! Please help get the word out by posting a link on Facebook, Twitter, MySpace, YouTube, news outlets and forums, to my site: http://lunarmeteoritehunters.blogspot.com/ TokyoLunarMeteorite*Hunter, Tokyo, Japan Thank you! IF you do see a big meteor please email me at LunarMeteoriteHunter@gmail.com (see below in red print as to the information we need. Thank you! O! NEO O!; UPCOMING CLOSE APPROACHES TO EARTH 1 AU = ~150 million kilometers 1 LD = Lunar Distance = ~384,000 kilometers Object Name Close Approach Date Miss Distance (AU) Miss Distance (LD) Estimated Diameter* H (mag) Relative Velocity (km/s) 65909 (1998 FH12) 2011-Jun-23 0.1379 53.7 400 m - 900 m 19.1 20.98 (2007 CS5) 2011-Jun-23 0.1167 45.4 33 m - 75 m 24.5 8.48 (2009 WW104) 2011-Jun-24 0.0399 15.5 80 m - 180 m 22.6 12.14 (2011 KW15) 2011-Jun-26 0.1072 41.7 310 m - 690 m 19.7 21.67 (2008 WM64) 2011-Jun-26 0.1015 39.5 200 m - 440 m 20.6 17.30 3988 (1986 LA) 2011-Jun-27 0.1853 72.1 700 m 18.2 7.93 (2011 MD) 2011-Jun-27 0.0001 0.05 8.0 m - 18 m 27.6 6.77 (2008 CY21) 2011-Jun-27 0.1505 58.6 31 m - 68 m 24.7 9.53 (2008 YC3) 2011-Jun-29 0.1721 67.0 23 m - 51 m 25.4 8.78 (2011 MC) 2011-Jun-29 0.0735 28.6 130 m - 300 m 21.5 17.19 (2010 NY65) 2011-Jun-30 0.1448 56.3 120 m - 270 m 21.7 16.27 (2002 EM7) 2011-Jul-01 0.0284 11.0 35 m - 79 m 24.4 10.6 Source: http://neo.jpl.nasa.gov/ca/ NASA/JPL/CalTech Ephemeris http://ssd.jpl.nasa.gov/horizons.cgi?CGISESSID=ee9b33fb2cb6f942721f48316c65a 709#results Date and Time of event? Location name (town,city) where you were when saw the meteor? Start and Stop location in sky? Direction of movement? Duration of Event (seconds)? Brightness ( in comparison with Venus, Moon, Sun) color, sounds? Photos? Videos? please email LunarMeteoriteHunter@gmail.com Your reports make it possible for all to check what they saw as well. Thank you! 2011 Year of Meteors! http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
I would like to image this thing. Any idea what constellation it will be in the night of the 27th? -David On 6/24/2011 9:13 AM, Barrett wrote:
http://neo.jpl.nasa.gov/news/news172.html
Bend it Like Beckham! Small Asteroid to Whip Past Earth on June 27, 2011 Don Yeomans& Paul Chodas NASA/JPL Near-Earth Object Program Office June 23, 2011
Trajectory of 2011 MD projected onto the Earth's orbital plane. Note from this viewing angle, the asteroid passes underneath the Earth.
Trajectory of 2011 MD from the general direction of the Sun.
Near-Earth asteroid 2011 MD will pass only 12,000 kilometers (7,500 miles) above the Earth's surface on Monday June 27 at about 9:30 EDT. The asteroid was discovered by the LINEAR near-Earth object discovery team observing from Socorro, New Mexico. The diagram on the left shows the trajectory of 2011 MD projected onto the Earth's orbital plane over a four-day interval. The diagram on the left gives another view from the general direction of the Sun that indicates that 2011 MD will reach its closest Earth approach point in extreme southern latitudes (in fact over the southern Atlantic Ocean). This small asteroid, only 5-20 meters in diameter, is in a very Earth-like orbit about the Sun, but an orbital analysis indicates there is no chance it will actually strike Earth on Monday. The incoming trajectory leg passes several thousand kilometers outside the geosynchronous ring of satellites and the outgoing leg passes well inside the ring. One would expect an object of this size to come this close to Earth about every 6 years on average. For a brief time, it will be bright enough to be seen even with a modest-sized telescope.
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Barrett Sent: Thursday, June 23, 2011 10:58 AM To: 'Utah Astronomy' Subject: [Utah-astronomy] NEO ALERT!! Very Close! Importance: High
http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html
24 June 2011Breaking News Alert! O! NEOs to Rock, Rattle, and Roll 2011MD VERY Close Approach 27JUN2011 Alert! NEOs Rock, Rattle, and Roll! Green Meteor Fireballs and Maybe a Bolide or more! (Issued 24JUN2011 1:30 am Tokyo by LunarMeteorite*Hunter) This is an alert; we will have a very close visitor, (2011 MD) 2011-Jun-27 0.0001 0.05LD 8.0 m - 18 m 27.6 6.77 within ~19,200km or 12,000 miles (about the distance from New Zealand to Great Britian - NOT far by space standards) on 27JUN2011! I expect we will see many large fireball events just prior to from today until July 5! Have your pointed and ready to capture and IF you have time get outside and observe and you might get lucky! Please help get the word out by posting a link on Facebook, Twitter, MySpace, YouTube, news outlets and forums, to my site: http://lunarmeteoritehunters.blogspot.com/ TokyoLunarMeteorite*Hunter, Tokyo, Japan Thank you! IF you do see a big meteor please email me at LunarMeteoriteHunter@gmail.com (see below in red print as to the information we need. Thank you! O! NEO O!;
UPCOMING CLOSE APPROACHES TO EARTH 1 AU = ~150 million kilometers 1 LD = Lunar Distance = ~384,000 kilometers Object Name Close Approach Date Miss Distance (AU) Miss Distance (LD) Estimated Diameter* H (mag) Relative Velocity (km/s) 65909 (1998 FH12) 2011-Jun-23 0.1379 53.7 400 m - 900 m 19.1 20.98 (2007 CS5) 2011-Jun-23 0.1167 45.4 33 m - 75 m 24.5 8.48 (2009 WW104) 2011-Jun-24 0.0399 15.5 80 m - 180 m 22.6 12.14 (2011 KW15) 2011-Jun-26 0.1072 41.7 310 m - 690 m 19.7 21.67 (2008 WM64) 2011-Jun-26 0.1015 39.5 200 m - 440 m 20.6 17.30 3988 (1986 LA) 2011-Jun-27 0.1853 72.1 700 m 18.2 7.93 (2011 MD) 2011-Jun-27 0.0001 0.05 8.0 m - 18 m 27.6 6.77 (2008 CY21) 2011-Jun-27 0.1505 58.6 31 m - 68 m 24.7 9.53 (2008 YC3) 2011-Jun-29 0.1721 67.0 23 m - 51 m 25.4 8.78 (2011 MC) 2011-Jun-29 0.0735 28.6 130 m - 300 m 21.5 17.19 (2010 NY65) 2011-Jun-30 0.1448 56.3 120 m - 270 m 21.7 16.27 (2002 EM7) 2011-Jul-01 0.0284 11.0 35 m - 79 m 24.4 10.6
Source: http://neo.jpl.nasa.gov/ca/ NASA/JPL/CalTech
Ephemeris http://ssd.jpl.nasa.gov/horizons.cgi?CGISESSID=ee9b33fb2cb6f942721f48316c65a 709#results Date and Time of event? Location name (town,city) where you were when saw the meteor? Start and Stop location in sky? Direction of movement? Duration of Event (seconds)? Brightness ( in comparison with Venus, Moon, Sun) color, sounds? Photos? Videos? please email LunarMeteoriteHunter@gmail.com Your reports make it possible for all to check what they saw as well. Thank you! 2011 Year of Meteors!
http://lunarmeteoritehunters.blogspot.com/2011/06/breaking-news-alert-neos-t o-rock-rattle.html
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Hi David, On 24 Jun 2011, at 14:13, David Rankin wrote:
I would like to image this thing. Any idea what constellation it will be in the night of the 27th?
-David
I don't know the constellation but if RA and Dec will help here's where I got the information I used to shoot the animation I posted of 2011 MD this morning: http://www.minorplanetcenter.org/iau/MPEph/MPEph.html Where it asks for a designation enter: 2011 MD You can enter your lat/long in the spaces provided but you can also use my observatory number 718. It looks like it will not be visible from Utah at closest approach. Last chance we'll have to see it high in the sky at night will be Sunday night into Monday morning. Closest approach a few hours later is during daylight here in Utah. Just as well as at that time it'll be screaming across the sky at nearly 2,200"/min. Zoom! :) patrick
participants (6)
-
Barrett -
daniel turner -
David Rankin -
Debbie -
erikhansen＠thebluezone.net -
Patrick Wiggins