HD 12139
DSS image of HD 12139
Overlaid DSS image of HD 12139, 60' x 60' with north at top and west to the right

Aladin viewer for the region around HD 12139
Σ 196D, BD+20 322, HR 577, WDS J01596+2100D, SAO 75077, GSC 01213-01622, HIP 9307

Type  Star
Magnitude  5.892
Right Ascension  1h 59' 35.7"  (2000)
Declination  21° 3' 31" N
Constellation  Aries
Classification  K0III-IV
Observing Notes

Andrew Cooper
Oct 20, 2023    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 6 Transparency: 7 Moon: 0%

Orange, no companion noted, the delicate double Σ 196 is 3' south

Oddly HR 577 is listed in WDS as the D component of Σ 196 when in fact this 6th magnitude star is much further away than the 9/10th magnitude pair with a parallax of 9.4mas compared to about 15mas for the WDS A and B components

Captain William Henry Smyth
Oct 16, 1836    No. 6 The Crescent, Bedford, England (map)
150mm f/17.6 refractor by Tully 1827

A quadruple star, in mid-distance between α and γ, under the Ram's ear, lying nearly at right angles with the vertical. A 6, topaz yellow; B 15, deep blue; C 10, lilac; and D 9, pale blue. This is an exquisite object, of which the three southern members form No. 196 of Σ.'s grand Catalogue, under these measures:
    Pos. AB  53°.53  Dist.  2".370  Ep 1832.42
AC 167°.38 39".460
This group is most difficult to observe, and the results are rather estimations than measures, particularly those of AB. Still, under every disadvantage, it forms an admirable test to try the light and distinctness of a telescope.
― A Cycle of Celestial Objects Vol II, The Bedford Catalogue, William Henry Smyth, 1844
Other Data Sources for HD 12139
Associated objects for HD 12139
Nearby objects for HD 12139
4 objects found within 60'
Σ 196 SAO 75075
UGC 1547
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

HD 12139