Talk:Mu Canis Majoris

CCDM J06561-1402 AB

 * CCDM J06561-1402 AB
 * SIMBAD
 * CCDM J06561-1402 A
 * SIMBAD HD 51250
 * CCDM J06561-1402 B
 * SIMBAD HD 51251

It seems like the second component is a BV star. 70.24.251.208 (talk) 14:51, 2 June 2012 (UTC)

Thanks guys for catching my typo!
Really embarrassed. Benkenobi18 (talk) 18:37, 2 June 2012 (UTC)

18 Canis Majoris
Is Mu Canis Majoris (HD 56847 @ 07 18 09.638 -15 37 41.98) a different star than HD 51250 (06 56 06.646 -14 02 36.35)? -- Kheider (talk) 23:43, 2 June 2012 (UTC)
 * Seems to be... MU CMa (HD 56847)... which is listed as "V* MU CMa", variable star MU CMa, so "MU" is the variable star designation (double latin-letter). So it would be MU Canis Majoris, part of cluster NGC 2360 -- 70.24.251.208 (talk) 07:26, 3 June 2012 (UTC)
 * Assuming I am following this correctly, the unreferenced Italian Wiki is describing the wrong Mu Canis Majoris? -- Kheider (talk) 08:59, 3 June 2012 (UTC)
 * Yes, I think so, the "u" should be capitalized. 70.24.251.208 (talk) 11:36, 3 June 2012 (UTC)
 * Sounds correct. The AAVSO International Variable Star Index lists MU CMa as a vmag 9 variable. -- Kheider (talk) 17:56, 3 June 2012 (UTC)
 * Can you rename the Italiano article? Since we've figured it out, a fix should probably be done. 70.24.251.208 (talk) 05:53, 5 June 2012 (UTC)
 * I've fixed the French article, it now separates MU and Mu Mu Canis Majoris, MU Canis Majoris. -- 70.24.251.208 (talk) 06:08, 5 June 2012 (UTC)
 * Someone has renamed the Italian article. 70.24.251.208 (talk) 04:19, 16 June 2012 (UTC)
 * Thank you for following up on this. -- Kheider (talk) 09:41, 16 June 2012 (UTC)

Quadruple
Is this a visual quadruple or a physical quadruple? At an estimated distance of 1000 ly, I assume components C+D are visual. -- Kheider (talk) 01:23, 4 June 2012 (UTC)

http://www.alcyone.de/cgi-bin/search.pl?object=HR2593

AB are spectroscopic binaries, ang sep of 3 arcsec.

88.4 arcsec ang sep for AC 101.3 arcsec ang sep for AD

SOH CAH TOA -

tan (3 arcsec) = O/A. tan (3 arcsec) A = 0.00404 parsecs. 1 AU = 206 x 10^3 = 834 AUs or so.

3/101.3 = 28,161 AUs, or 0.1365 PCs or .455 ly from the principal star. That's about twice as far as Proxima is from Alpha and Beta Centauri. So you've got the tight pair, and the two smaller stars that are quite a bit more distant. Physical double and quadruple system since the proper motions all line up, with C and D quite distant from A+B (which aren't all that close to each other.