Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Puppis |
Right ascension | 07h 57m 40.10678s [1] |
Declination | −30° 20′ 04.4491″ [1] |
Apparent magnitude (V) | 4.79 [2] |
Characteristics | |
Spectral type | A5 II [3] or A7 III [4] or A2 Vv [5] |
U−B color index | +0.16 [2] |
B−V color index | +0.151±0.012 [6] |
Astrometry | |
Radial velocity (Rv) | +30.0±0.5 [7] km/s |
Proper motion (μ) |
RA: −8.643
[1]
mas/
yr Dec.: +6.055 [1] mas/ yr |
Parallax (π) | 1.7957 ± 0.1890 mas [1] |
Distance | approx. 1,800
ly (approx. 560 pc) |
Absolute magnitude (MV) | −3.07 [6] |
Details | |
Radius | 30.39+1.53 −1.70 [1] R☉ |
Luminosity | 3,116±374 [1] L☉ |
Surface gravity (log g) | 2.17 [8] cgs |
Temperature | 7,823+229 −190 [1] K |
Rotational velocity (v sin i) | 39.2±0.3 [9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
χ Puppis, Latinised as Chi Puppis, is a single [11] star in the southern constellation of Puppis. It has a white hue and is faintly visible to the eye at night with an apparent visual magnitude of 4.79. [2] The star is located at a distance of approximately 1,800 light years from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +30 km/s. [7] O. J. Eggen listed this star as a member of the Hyades Stream based on its space motion. [12]
There has been some disagreement as to the stellar classification of Chi Puppis. In 1962, W. Buscombe classified it as A2Vvar, [13] matching a variable A-type main-sequence star. However, P. S. Conti in 1965 considered that to be a misclassification on the basis of its B-V color index. He considers it of later type A5. [14] In their study of the nearby open cluster NGC 2483, M. P. Fitzgerald and A. F. J. Moffat used the same class, A2Vv. [5] In 1979, Nancy Houk assigned it to class A7 III, [4] indicating it may be an A-type giant star. Finally, R. O. Gray and associates found a class of A5 II, [3] matching a bright giant.
In his star atlas Neue Uranometrie, Friedrich Wilhelm Argelander labelled this star as χ Argo. It was probably labelled as χ by Bayer in the original Uranometria, although Bayer's chart is somewhat fanciful. Nicolas-Louis de Lacaille changed Bayer's designations in Argo Navis and applied χ to the star now called χ Carinae. [15]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Puppis |
Right ascension | 07h 57m 40.10678s [1] |
Declination | −30° 20′ 04.4491″ [1] |
Apparent magnitude (V) | 4.79 [2] |
Characteristics | |
Spectral type | A5 II [3] or A7 III [4] or A2 Vv [5] |
U−B color index | +0.16 [2] |
B−V color index | +0.151±0.012 [6] |
Astrometry | |
Radial velocity (Rv) | +30.0±0.5 [7] km/s |
Proper motion (μ) |
RA: −8.643
[1]
mas/
yr Dec.: +6.055 [1] mas/ yr |
Parallax (π) | 1.7957 ± 0.1890 mas [1] |
Distance | approx. 1,800
ly (approx. 560 pc) |
Absolute magnitude (MV) | −3.07 [6] |
Details | |
Radius | 30.39+1.53 −1.70 [1] R☉ |
Luminosity | 3,116±374 [1] L☉ |
Surface gravity (log g) | 2.17 [8] cgs |
Temperature | 7,823+229 −190 [1] K |
Rotational velocity (v sin i) | 39.2±0.3 [9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
χ Puppis, Latinised as Chi Puppis, is a single [11] star in the southern constellation of Puppis. It has a white hue and is faintly visible to the eye at night with an apparent visual magnitude of 4.79. [2] The star is located at a distance of approximately 1,800 light years from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +30 km/s. [7] O. J. Eggen listed this star as a member of the Hyades Stream based on its space motion. [12]
There has been some disagreement as to the stellar classification of Chi Puppis. In 1962, W. Buscombe classified it as A2Vvar, [13] matching a variable A-type main-sequence star. However, P. S. Conti in 1965 considered that to be a misclassification on the basis of its B-V color index. He considers it of later type A5. [14] In their study of the nearby open cluster NGC 2483, M. P. Fitzgerald and A. F. J. Moffat used the same class, A2Vv. [5] In 1979, Nancy Houk assigned it to class A7 III, [4] indicating it may be an A-type giant star. Finally, R. O. Gray and associates found a class of A5 II, [3] matching a bright giant.
In his star atlas Neue Uranometrie, Friedrich Wilhelm Argelander labelled this star as χ Argo. It was probably labelled as χ by Bayer in the original Uranometria, although Bayer's chart is somewhat fanciful. Nicolas-Louis de Lacaille changed Bayer's designations in Argo Navis and applied χ to the star now called χ Carinae. [15]