HD 3125
DSS image of HD 3125
Overlaid DSS image of HD 3125, 60' x 60' with north at top and west to the right

Aladin viewer for the region around HD 3125
Σ39, BD-05 83, WDS J00345-0433AB, SAO 128831, GSC 04675-00561, HIP 2713

Type  Star
Magnitude  7.02
Right Ascension  0h 34' 29.8"  (2000)
Declination  4° 32' 48" S
Constellation  Cetus
Classification  G7III
Observing Notes

Andrew Cooper
Nov 11, 2020    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 4 Transparency: 6 Moon: 0%

Pale yellow, WDS lists 4 components, B is an 8th magnitude 0.3" companion which is not visible, C is an 8th magnitude star which is easily visible 20" to the northeast, D is a 10th magnitude also easily visible 3' to the south

Examining the Gaia DR2 data shows the D companion to be a background star, while the C companion is more interesting. The parallax is a full mas different, with the AB pair showing 7.8663mas or 414ly while C shows 9.0841mas or 359ly. While the distances do not line up the proper motion is a good match with the AB pair at 83.985mas/yr in RA and 6.864mas/yr in dec while C shows 86.324mas/yr in RA and 6.224mas/ys in dec. It is possible that these two stars are related in some fashion.

Captain William Henry Smyth
Nov 14, 1832    No. 6 The Crescent, Bedford, England (map)
150mm f/17.6 refractor by Tully 1827

A neat double star, between the whale's tail and the chétil of Pisces, on a line striking from β Ceti through α Andromedæ, and about one- third of the distance. A 7, cream yellow; and B 9, smalt blue. This is a fine object, being nearly mid-way between two stars, one in the sf quadrant, and the smallest in the np. It is No. 39 of Σ's grand Catalogue, where the mean of his observations gives: Pos. 45°27' Dist. 20".09 Ep. 1830.24

My own measures were taken under favourable circumstances, and may therefore be deemed good. Piazzi tells us that in Flamsteed's asterism, a companion of the 9th magnitude follows this star, by lls.2 of time, which he could not find. There is, however, at about the same distance, and to the north, a star of this character, although rather smaller. Is the follower, then, variable?
― A Cycle of Celestial Objects Vol II, The Bedford Catalogue, William Henry Smyth, 1844
Other Data Sources for HD 3125
Nearby objects for HD 3125
7 objects found within 120'
12 Ceti 13 Ceti HD 3807
IC 1557 NGC 111
NGC 161
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 3125