Nu-1 in Canis Majoris


 
Bob Hogeveen 
Star: Nu-1 in Canis Majoris
Date & Time: January 3, 2002 (00.30) 
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparancy: 7 <1-10 Scale (10 best)> 
Location of site: Annen, The Netherlands
53N, 6E
Site classification: Village backyard
Sky darkness: 4 <Limiting magnitude>
Telescope: Swarovski AT80 spottingscope
Magnification: 20x, 60x
Harshaw Scale: 3 <1-5; 1 best>
At the moment of observation this pair had already set behind the treetops to the south of my observing location, but was still somewhat visible through the leafless branches. I can imagine this is a very pretty double when it can be seen clearly. It is easy to see and split @ 20x and the primary is a beautiful deep-yellow.

The orientation of this pair is almost horizontal when it's in the south.
A pro if this double is that it is very easy to locate, 3 degrees wsw of Sirius and in the middle of the three bright stars Nu-3, Nu-1, Nu-2.
 


 
Bill Becker
Star: Nu-1 in Canis Majoris
Date & Time: Jan.3rd from 4:42 to 6:15 UT
Seeing: 4 <1-10 Seeing Scale (10 best)>
Location of site: Casper, Wy. USA
Site classification: Suburban
Sky darkness: 5 <Limiting magnitude>
Telescope: TEC 6 Mak-Cass
Magnification: ~51x(35mm Panoptic)
The faintest and middle star of Nu 1,2, and 3, this was one of myfavs that I viewed tonight. The primary was faintly yellow and thesecondary looked distinctly deep blue. 

 


 
Paolo Morini
Star: Nu-1 in Canis Majoris
Date & Time: 4 Jan 2001, 22.30 UTC
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Italy, Ravenna
Elevation: 0 m
Site classification: Urban
Sky darkness: 4 <Limiting magnitude>
Temperature: -3C
Telescope: Televue Pronto
Eyepiece(s): 9.5 mm Konig by Columbia Optics + 90 degerecting diagonal
Magnification: 50x
Nu1 CMa is a very fine double star, I have tried to estimate the colours and I have found the secondary to be "coldest" in color than the primary, say bluish-greenish toward yellow. The day after I checked that, Kepple and Sanner in their book say "subtle yellow and dark blue"!. I am quite satisfied about, not badfor a man  (probably a lady would not be surprised about thisresult, as color blindness at low light level is stronger in men than in women).

 
Daniel Osanai
Star: Nu-1 in Canis Majoris
Date & Time: January 4th, 2002 21:15 UT 
Seeing: 9 <1-10 Seeing Scale (10 best)>
Location of site: Lolog, Argentina
71º18´W, 40º02´S 
Site classification: Rural
Sky darkness: 6.0 <Limiting magnitude>
Telescope: Refractor Vixen 60S f/7
on equatorial mount & SS2K 
Eyepieces: ULTIMA 30 mm, Powermate 2.5x
Magnification: 40x
Nu 1 is easily lied between Nu´s, 2 and 3; and it is visible with naked eyes. AB shows very closely together but it is clearly resolved at 40x. A is bright and yellowish, and B is fainter and white.
 
 

 


 
Eddy O’Connor
Star: Nu-1 in Canis Majoris
Date & Time: January 7th, 2001
10 p.m local; UT +10
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: 8 <1-10 Seeing Scale (10 best)>
Temperature: 20ºC
Location of site: Terara, New South Wales, Australia
150º.38 E, 34º.52 S
Site classification: Suburban-rural
Sky darkness:  No Moon. 
Telescope: 8" Newt. F9
Eyepieces: 25mm K, 12.5 mm Ortho
Magnification: 73x, 146x
Harshaw Scale: 2 <1-5; 1 best> 
This is one of three stars slightly south and midway of a line joining Sirius with Beta Can.  At first the unthinkable happened and I failed to split this wide double. I made several adjustments to my collimation, rubbed my eyes several times, returned to my map and seriously questioned my eyesight and sanity. I did make note of a stunning nearby star and in the cool light of the next morning the mystery was revealed. My 
ancient copy of Norton revealed that the nearby double was, in fact, the real double, so my visit to the optometrist was cancelled. (I insert arrows on my maps marking double stars before my viewing sessions and rarely question them. The difference in magnitudes of Nu 1 and Nu2 should have provided a  clue to the normal brain!)

Comments: My wretched computer generated map merely lists Nu 1 as SHJ73. I noted it as a Yellowish primary with a wide Bluish companion.


 
Glen Chapman
Star: Nu-1 in Canis Majoris
Date & Time: 10/01/2002, 9:30 pm
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: 4 <1-10 Seeing Scale (10 best)>
Location of site: Seven HIlls NSW, Australia
Site classification: Suburban
Sky darkness: ---
Telescope: 8 inch Celetron Starhopper
Magnification: 48x
Using Nu 3 for naked eye targeting. This interesting double can be found bracketed by Nu 2 and 3. Almost in the same field is the fainter, B 2522. The colour combination needed slightly higher (96x) power to bring them to their greatest contrast. I am surprised more guides don’t include this star in ‘best of lists’.

A – White to yellow B – pale blue.
 


 
 
Steve Bodin
Star: Nu-1 in Canis Majoris
Date & Time: 3 Feb 2002, 9pm local
Seeing: --- <1-10 Seeing Scale (10 best)>
Location of site: Silverdale Wa, USA 47N,123W
Site classification
Sky darkness: 5.0, High cirrus <Limiting magnitude>
Telescope: Celestron 8 SC
Eyepiece: PC23 Videocamera
Magnification: ---
Easy object visually nice yellow primary, blue secondary.
 
Measures 17.8 sec / 265 deg PA