Cor Caroli

Francisco Manuel Lozano
Star: Cor Caroli
Date & Time: February 28th 2005 21.30 UT
Seeing: 3-4 <1-10 Seeing Scale (10 best)>
Transparency: 8 <1-10 Scale (10 best)>
Location of site: Colmenar Viejo, Madrid,
Spain
Site classification: Urban
Temperature: -4ºC
Moon: Below the horizon
Sky darkness:  <Limiting magnitude> 
Telescope: Celestron C102HD
(4", f10 achromatic refractor)
Eyepieces: Moonfish 20mm
Magnification: 50x
Camera: Philips Toucam Pro II
 

First attempt on current project was last monday on Cor Caroli. Because of the light pollution I was able to see only the brightest stars from my balcony (east). So the target had to be easy to find. The session lasted about ten minutes, the cold outside (-4ºC) let me make only a pair of windy videos. Turbulence was terrible, seeing 3-4/10. It was a clear night with about 8/10 on transparency.

 
This time, because of wind, the PA measurement has not been very accurate, but grabbing the video at 30 fps, the separation has gone quite well, I think.
cam Pro II.

I've made twenty nine measurements, sorted them and discarded seven up and seven down. With the other fifteen averaged the next results:

SEP --> 18.98"
PA  --> 233.3º


  


Steve Bodin
Star: Cor Caroli
Date & Time: 10/3/2005
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: fair
Location of site: Silverdale Wa, USA 47N,123W
Site classification: Suburban
Conditions: 45F, damp, no wind
Moon:
Sky darkness: 5.5 <Limiting magnitude> 
Telescope: C8
Eyepieces: no used
Magnification: appx. 350x
Camera: DX8263SL video camera at prime focus
 
Just one more bright one thru the fog. Popular pair that I have
visited before. Measured 19.92 sec at 227.7 deg PA.
 
 




 
Tim Leese
Star: Cor Caroli
Date & Time: 22-23/3/2005 (0:40 UT)
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency:  <1-10 Scale (10 best)>
Location of site: Northwich, Cheshire. UK. (53° 15' N -2º 33' W)
Site classification: Suburban
Conditions: Clear sky. Moon bright. Slight breeze at times
Sky darkness:  <Limiting magnitude> 
Telescope: 4inch f/15 Vixen achromat
Mount: EQ5
Eyepieces: 30mm Ultima, 9mm Orthoscopic, 9mm + x2 barlow.
Magnification: x50, x167, x333

 		30mm Ultima......This star is one of my all time favourites for a spring sky. I relish the view through this refractor at this magnification.  The primary appeared as a white colour, but at times a delicate shade of pale yellow.  The companion located at the listed PA appeared to be a pale blue colour at all times.  An interesting
viewing position at the telescope eyepiece though!!

9mm Or........A very nice wide split at this magnification. The stars seemed to show an improved contrast with the primary a pale yellow with a light lilac coloured companion.

9mm Or + x2 barlow...An exquisite image of a pale yellow star with a definite lilac coloured companion.  There was no need for such a high magnification but I found it very interesting to see the delicate diffraction rings.  The odd moments of steady air were well worth waiting for. Superb.

 
Louis Marchesi
Star: Cor Caroli
Date & Time: 10 April 2005 3:51 UTC
Seeing: Pickering 6
Transparency: Above Average
Location of site: New London Township, PA, US
(+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, -1C (30F)
Sky darkness: Not determined
Moon: None
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: 17mm Nagler
Magnification: 71x

 		Wide and easy at 71x. At first, I saw both stars in this pair as white. But with a little further scrutiny, I noticed the comes appeared to be redder than the primary; I'll call it a very pale rose. This has long been on of my favorites.

(c) 1998-2005 The Spirit of 33