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2 Pegasi

January 01, 1970

2 Pegasi is a single[9] star in the constellation Pegasus, located approximately 394 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of 4.52.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[6] It has a magnitude 12.7 visual companion, designated component B, at an angular separation of 30.4″.[10]

2 Pegasi
Location of 2 Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 21h 29m 56.89545s[1]
Declination 23° 38′ 19.8170″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M1+III[4]
U−B color index +1.93[5]
B−V color index +1.62[5]
Astrometry
Radial velocity (Rv)−18.92[6] km/s
Proper motion (μ) RA: +24.74[1] mas/yr
Dec.: +3.63[1] mas/yr
Parallax (π)8.28 ± 0.18 mas[1]
Distance394 ± 9 ly
(121 ± 3 pc)
Absolute magnitude (MV)−0.89[2]
Details
Radius55[7] R☉
Luminosity653[7] L☉
Temperature3,919[7] K
Other designations
2 Peg, NSV 25624, BD+23°4325, FK5 1565, GC 30109, HD 204724, HIP 106140, HR 8225, SAO 89752, CCDM J21299+2338A, WDS J21299+2338A[8]
Database references
SIMBADdata

This is an aging red giant star with a stellar classification of M1+III,[4] currently on the asymptotic giant branch,[3] having exhausted the hydrogen at its core and evolved away from the main sequence. The star has expanded to an estimated 55 times the radius of the Sun.[7] It is radiating 653 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,919 K.[7]

References edit

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c 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. Vizier catalog entry
  3. ^ a b Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  5. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. ^ a b Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy and Astrophysics. 498 (2): 627. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. S2CID 18739721.
  7. ^ a b c d e 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.
  8. ^ "2 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-07.
  9. ^ 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.
  10. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry

January 01, 1970
pegasi, single, star, constellation, pegasus, located, approximately, light, years, away, from, based, parallax, visible, naked, faint, hued, star, with, apparent, visual, magnitude, object, moving, closer, earth, with, heliocentric, radial, velocity, magnitud. 2 Pegasi is a single 9 star in the constellation Pegasus located approximately 394 light years away from the Sun based on parallax 1 It is visible to the naked eye as a faint red hued star with an apparent visual magnitude of 4 52 2 The object is moving closer to the Earth with a heliocentric radial velocity of 19 km s 6 It has a magnitude 12 7 visual companion designated component B at an angular separation of 30 4 10 2 PegasiLocation of 2 Pegasi circled Observation dataEpoch J2000 Equinox J2000 Constellation Pegasus Right ascension 21h 29m 56 89545s 1 Declination 23 38 19 8170 1 Apparent magnitude V 4 52 2 Characteristics Evolutionary stage AGB 3 Spectral type M1 III 4 U B color index 1 93 5 B V color index 1 62 5 AstrometryRadial velocity Rv 18 92 6 km sProper motion m RA 24 74 1 mas yr Dec 3 63 1 mas yrParallax p 8 28 0 18 mas 1 Distance394 9 ly 121 3 pc Absolute magnitude MV 0 89 2 DetailsRadius55 7 R Luminosity653 7 L Temperature3 919 7 K Other designations2 Peg NSV 25624 BD 23 4325 FK5 1565 GC 30109 HD 204724 HIP 106140 HR 8225 SAO 89752 CCDM J21299 2338A WDS J21299 2338A 8 Database referencesSIMBADdata This is an aging red giant star with a stellar classification of M1 III 4 currently on the asymptotic giant branch 3 having exhausted the hydrogen at its core and evolved away from the main sequence The star has expanded to an estimated 55 times the radius of the Sun 7 It is radiating 653 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3 919 K 7 References edit a b c d e f Van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Vizier catalog entry a b c 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 Vizier catalog entry a b Eggen O J 1992 Asymptotic giant branch stars near the sun The Astronomical Journal 104 275 Bibcode 1992AJ 104 275E doi 10 1086 116239 a b Hoffleit D Warren W H 1995 VizieR Online Data Catalog Bright Star Catalogue 5th Revised Ed Hoffleit 1991 VizieR On line Data Catalog V 50 Originally Published in 1964BS C 0H 5050 Bibcode 1995yCat 5050 0H a b Mallama A 2014 Sloan Magnitudes for the Brightest Stars The Journal of the American Association of Variable Star Observers 42 2 443 Bibcode 2014JAVSO 42 443M Vizier catalog entry a b Famaey B Pourbaix D Frankowski A Van Eck S Mayor M Udry S Jorissen A 2009 Spectroscopic binaries among Hipparcos M giants Astronomy and Astrophysics 498 2 627 arXiv 0901 0934 Bibcode 2009A amp A 498 627F doi 10 1051 0004 6361 200810698 S2CID 18739721 a b c d e Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR 2 Peg SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 04 07 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 Mason Brian D Wycoff Gary L Hartkopf William I Douglass Geoffrey G Worley Charles E 2001 The 2001 US Naval Observatory Double Star CD ROM I The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Bibcode 2001AJ 122 3466M doi 10 1086 323920 Vizier catalog entry Retrieved from https en wikipedia org w index php title 2 Pegasi amp oldid 1079521813, wikipedia, wiki, book, books, library,

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