HD 15920

Giant star in the constellation Cassiopeia

HD 15920  Observation data
Epoch J2000.0 Equinox J2000.0

Constellation | Cassiopeia
Right ascension | 02h 38m 02.03097s[1]
Declination | +72° 49′ 05.7106″[1]
Apparent magnitude (V) | 5.17[2]
Characteristics
Spectral type | G8III[3]
B−V color index | +0.896±0.003[2]
Astrometry
Radial velocity (Rv)| −3.69±0.13[1] km/s
Proper motion (μ)|  RA: −27.441[1] mas/yr
Dec.: +15.627[1] mas/yr
Parallax (π)| 12.1723 ± 0.1139 mas[1]
Distance| 268 ± 3 ly
(82.2 ± 0.8 pc)
Absolute magnitude (MV)| 0.70[2]
Details
Mass| 2.55±0.68[4] M☉
Radius| 10.06+0.15
−0.17[1] R☉
Luminosity| 60.7±0.7[1] L☉
Surface gravity (log g)| 2.91±0.11[4] cgs
Temperature| 5,080+37
−42[1] K
Metallicity [Fe/H]| 0.02±0.05[4] dex
Age| 977+198
−164[4] Myr
Other designations

BD+72°140, FK5 87, GC 3116, HD 15920, HIP 12273, HR 743, SAO 4694, GSC 04320-02109[5]

Database references
SIMBAD| data

HD 15920 is a single[6] star in the northern constellation of Cassiopeia. It has a yellow hue and is visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.17.[2] This object is located at a distance of approximately 268 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −4 km/s.[1]

This object is an aging giant star with a stellar classification of G8III.[3] After exhausting the supply of hydrogen at its core, this star has cooled and expanded off the main sequence – at present it has ten times the girth of the Sun.[1] The star is around a billion years old[4] with 2.6[4] times the mass of the Sun. It is radiating 61 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,080 K.[1] HD 15920 is the most likely source for the X-ray emission detected at these coordinates.[7]

## References[edit]

1. ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. ^ a b Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
4. ^ a b c d e f Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
5. ^ "HD 15920". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-16.
6. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
7. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.

* v
* t
* e

Constellation of Cassiopeia

* List of stars in Cassiopeia
* Cassiopeia in Chinese astronomy

Stars|

| Bayer|

* α (Schedar)
* β (Caph)
* γ
* δ (Ruchbah)
* ε (Segin)
* ζ (Fulu)
* η (Achird)
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ1
* υ2 (Castula)
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 1
* 2
* 4
* 6
* 9
* 10
* 12
* 42
* 47
* 48 (A)
* 49
* 50

Variable|

* R
* S
* TZ
* WZ
* YZ (21)
* AO
* AR
* PZ
* V373
* V509
* V547
* V669
* V705
* V863
* V773
* V987
* V1022
* V1405

HR|

* 144
* 196
* 244
* 273
* 297
* 743
* 932
* 8832
* 8853
* 8881

HD|

* 7924
* 7977
* 15558
* 17156 (Nushagak)
* 240210
* 240237
* 240429
* 240430

Other|

* BD+60°2522
* Gliese 49
* IRAS 23304+6147
* LS I +61 303
* PSR J0205+6449
* Tycho G
* 4U 0142+61
* WR 2
* WR 3

| Exoplanets|

* HD 7924 b
* HD 17156 b
* HD 219134 b
* c
* d
* e (h)
* f
* g
* HD 240210 b
* HD 240237 b

|

| Star clusters|

* Messier 52
* Messier 103
* NGC 103
* NGC 110
* NGC 129
* NGC 133
* NGC 136
* NGC 146
* NGC 189
* NGC 225
* NGC 358
* NGC 366
* NGC 381
* NGC 433
* NGC 436
* NGC 457
* NGC 559
* NGC 637
* NGC 654
* NGC 659
* NGC 663
* NGC 1027
* NGC 7789
* NGC 7790
* Trumpler 3

|

Nebulae|

| NGC|

* 281
* 7635

|

Other|

* 3C 58
* Cassiopeia A
* Heart Nebula
* IC 289
* IC 1805
* KjPn 8
* LBN 114.55+00.22
* Westerhout 5

Galaxies|

| NGC|

* 147
* 185
* 278

|

Other|

* Andromeda VII
* 3C 20
* 3C 35
* Dwingeloo 1
* Dwingeloo 2
* MB 3
* IC 10
* Maffei 1
* Maffei 2

| Astronomical events|

* SN 1181
* SN 1572 (B)

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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