HD 222093
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h37m39.56021s[1] |
| Declination | −13° 03′ 36.8732″[1] |
| Apparent magnitude(V) | 5.68[2]+ 9.6[3]or 11.19[4] |
| Characteristics | |
| Evolutionary stage | horizontal branch |
| Spectral type | K0III[5] |
| U−Bcolor index | +0.81[2] |
| B−Vcolor index | +0.99[2] |
| Astrometry | |
| Radial velocity(Rv) | −12.56±0.15[1]km/s |
| Proper motion(μ) | RA:+34.676[1]mas/yr Dec.:+26.758[1]mas/yr |
| Parallax(π) | 11.1185 ± 0.1442mas[1] |
| Distance | 293 ± 4ly (90 ± 1pc) |
| Details | |
| Mass | 1.51[6]M☉ |
| Radius | 10.00+0.47 −1.06[1]R☉ |
| Luminosity | 50.0±0.8[1]L☉ |
| Surface gravity(logg) | 2.7[7]cgs |
| Temperature | 4,853+279 −110[1]K |
| Metallicity[Fe/H] | −0.25[7]dex |
| Rotational velocity(vsini) | 0.0[7]km/s |
| Age | 3.17[6]Gyr |
| Other designations | |
| Database references | |
| HD 222093 | |
| SIMBAD | data |
| ADS 16878 | |
| SIMBAD | data |
HD 222093is adouble starin the equatorialconstellationofAquarius.It has an orange hue and is visible to the naked eye with anapparent visual magnitudeof 5.68.[2]The system is located at a distance of approximately 293light yearsfrom theSunbased onparallax,but is drifting closer with aradial velocityof −13 km/s.[1]
The primary component is an aging K-typegiant starwith astellar classificationof K0III,[5]which indicates it has exhausted the supply of hydrogen at itscorethen cooled and expanded. At present it has ten[1]times theSun's radius.This is ared clumpgiant,[9]which indicates it is on thehorizontal branchand is generating energy throughhelium fusionat itscore.It is around three billion years old with 1.5 times themass of the Sun.[6]The star is radiating fifty times theSun's luminosityfrom its swollenphotosphereat aneffective temperatureof 4,853 K.[1]
According to Eggleton and Tokovinin (2008), this is most likely a widebinary starsystem; the secondary companion is a magnitude 9.6 star at anangular separationof33.1″from the primary.[3]However, theWashington Visual Double Star Cataloggives a magnitude of 11.19 with an angular separation of30.2″.[4]
References[edit]
- ^abcdefghijklBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^abcdMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data. SIMBAD,Bibcode:1986EgUBV........0M.
- ^abEggleton, 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,S2CID14878976.
- ^abMason, B. D.; et al. (2014),"The Washington Visual Double Star Catalog",The Astronomical Journal,122(6): 3466,Bibcode:2001AJ....122.3466M,doi:10.1086/323920,retrieved2015-07-22.
- ^abHouk, Nancy; Smith-Moore, M. (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H.
- ^abcLuck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants",The Astronomical Journal,150(3): 88,arXiv:1507.01466,Bibcode:2015AJ....150...88L,doi:10.1088/0004-6256/150/3/88,S2CID118505114.
- ^abcMassarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity",The Astronomical Journal,135(1): 209–231,Bibcode:2008AJ....135..209M,doi:10.1088/0004-6256/135/1/209.
- ^"HD 222093".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-11-20.
- ^Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity",The Astrophysical Journal,539(2): 732–741,arXiv:astro-ph/0003329,Bibcode:2000ApJ...539..732A,doi:10.1086/309278,S2CID16673121.
