Omicron Pegasi

Short description: Star in the constellation Pegasus

Omicron Pegasi

Location of ο Pegasi (circled in red)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Pegasus
Right ascension |  22h 41m 45.39893s[1]
Declination | +29° 18′ 27.5542″[1]
Apparent magnitude (V) | +4.80[2]
Characteristics
Spectral type | A1 IV[3]
U−B color index | +0.035[4]
B−V color index | −0.013±0.002[2]
Astrometry
Radial velocity (Rv)| +8.5±0.1[2] km/s
Proper motion (μ)|  RA: −0.106[1] mas/yr
Dec.: −31.691[1] mas/yr
Parallax (π)| 11.4116 ± 0.4055[1] mas
Distance| 290 ± 10 ly
(88 ± 3 pc)
Absolute magnitude (MV)| −0.01[3]
Details
Mass| 2.24[5] M☉
Radius| 3.37±0.10[6] R☉
Luminosity| 85±6[6] L☉
Surface gravity (log g)| 3.81±0.04[6] cgs
Temperature| 9,600±50[6] K
Metallicity [Fe/H]| +0.25±0.09[6] dex
Rotational velocity (v sin i)| 6.0±0.2[3] km/s
Age| 184[5] Myr
Other designations

ο Peg, 43 Pegasi, BD+28°4436, HD 214994, HIP 112051, HR 8641, SAO 90717[7]

Database references
SIMBAD| data

ο Pegasi, Latinized as Omicron Pegasi, is a suspected astrometric binary[8] star system in the northern constellation of Pegasus. It is white in hue and visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.80.[2] The distance to this system is approximately 290 light years based on parallax,[1] and it is drifting further away from the Sun with a radial velocity of +8.5 km/s.[2]

The visible component has a stellar classification of A1 IV,[3] matching a subgiant star that has begun to cool, expand and brighten off the main sequence. It has very narrow lines due to a low projected rotational velocity of 6 km/s. The abundances of iron are Sun-like, while it displays an overabundance of heavier elements. Some studies have suggested it is an Am-like star.[3] Omicron Pegasi is an estimated 184 million years old with 2.24 times the mass of the Sun.[5] It is radiating 85 times the Sun's luminosity from its photosphere at an effective temperature of 9,600 K.[6]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A
3. ↑ 3.0 3.1 3.2 3.3 3.4 Gray, David F. (April 2014). "Precise Rotation Rates for Five Slowly Rotating a Stars". The Astronomical Journal 147 (4): 13. doi:10.1088/0004-6256/147/4/81. 81. Bibcode: 2014AJ....147...81G.
4. ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
5. ↑ 5.0 5.1 5.2 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Romanovskaya, A M; Ryabchikova, T A; Pakhomov, Yu V; Korotin, S A; Sitnova, T M (2023-12-11), "Non-LTE abundance analysis of A-B stars with low rotational velocities – II. Do A-B stars with normal abundances exist?", Monthly Notices of the Royal Astronomical Society 526 (3): 3386–3399, doi:10.1093/mnras/stad2862, ISSN 0035-8711.
7. ↑ "omi Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=omi+Peg.
8. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.

* v
* t
* e

Stars of Pegasus

Bayer|

* α (Markab)
* β (Scheat)
* γ (Algenib)
* ε (Enif)
* ζ (Homam)
* η (Matar)
* θ (Biham)
* ι
* κ
* λ
* μ (Sadalbari)
* ν
* ξ
* ο
* π1
* π2
* ρ
* σ
* τ (Salm)
* υ (Alkarab)
* φ
* χ
* ψ

Flamsteed|

* 1
* 2
* 3
* 4
* 5
* 7
* 9
* 11
* 12
* 13
* 14
* 15
* 16
* 17
* 18
* 19
* 20
* 21
* 23
* 25
* 28
* 30
* 31
* 32
* 33
* 34
* 35
* 36
* 37
* 38
* 39
* 40
* 41
* 45
* 51 (Helvetios)
* 52
* 55
* 56
* 57
* 58
* 59
* 60
* 61
* 63
* 64
* 65
* 66
* 67
* 69
* 70
* 71
* 72
* 73
* 74
* 75
* 76
* 77
* 78
* 79
* 80
* 82
* 83
* 85
* 86
* 87
* 23 Psc
* 34 Vul

Variable|

* R
* S
* U
* W
* Z
* RU
* RV
* RZ
* SV
* TW
* TY
* AG
* AQ
* AT
* AU
* AV
* AW
* BB
* BH
* BK
* BO
* BP
* BX
* BY
* DH
* DI
* DY
* EE
* EF
* EQ
* EZ
* GT
* GX
* HN
* HO
* HP
* HR
* HX
* II
* IK
* IM
* IP
* KT
* KU
* LL
* LO
* LS
* MS
* MT
* NV
* NZ
* OY
* PT
* V342
* V343
* V354
* V363
* V372
* V376
* V391

HR|

* 19
* 49
* 8116
* 8219
* 8221
* 8231
* 8250
* 8257
* 8258
* 8274
* 8292
* 8325
* 8341
* 8348
* 8358
* 8359
* 8364
* 8372
* 8391
* 8397
* 8412
* 8415
* 8435
* 8441
* 8455
* 8456
* 8458
* 8460
* 8461
* 8466
* 8475
* 8482
* 8491
* 8503
* 8514
* 8543
* 8555
* 8564
* 8587
* 8604
* 8605
* 8608
* 8631
* 8638
* 8642
* 8737
* 8784
* 8788
* 8792
* 8824
* 8831
* 8833
* 8838
* 8839
* 8873
* 8922
* 8942
* 8953
* 8970
* 9039
* 9055
* 9078
* 9109

HD|

* 434
* 204603
* 205011
* 205422
* 205603
* 206689
* 206793
* 208897
* 209709
* 210890
* 211076
* 213025
* 215549
* 215733
* 219196
* 219828
* 220288
* 220773
* 221170
* 221493
* 225292

Gliese|

* Gliese 829
* Gliese 880

Other|

* BD+14 4559
* BD +17 4708
* BD +28 4211
* GD 246
* HAT-P-8
* NGC 8
* NGC 18
* NGC 30
* PG 2131+066
* PG 2303+243
* PSR B2127+11C
* PSR B2303+30
* WASP-10
* WASP-21
* WASP-52
* WASP-59
* WASP-60
* X2127+119

* List

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