EQ Pegasi

EQ Pegasi
EQ Pegasi is located in the constellation Pegasus
EQ Pegasi is located in the constellation Pegasus
EQ
Location of EQ Pegasi in the constellation Pegasus

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
EQ Pegasi A
Right ascension 23h 31m 52.17385s[1]
Declination +19° 56′ 14.1304″[1]
Apparent magnitude (V) 10.38 (min)[2]
EQ Pegasi B
Right ascension 23h 31m 52.57534s[3]
Declination +19° 56′ 14.0050″[3]
Apparent magnitude (V) 12.58 (min)[2]
Characteristics
EQ Pegasi A
Evolutionary stage red dwarf
Spectral type M4Ve[2]
Variable type Flare star[2]
EQ Pegasi B
Evolutionary stage red dwarf
Spectral type M6Ve[2]
Variable type Flare star[2]
Astrometry
EQ Pegasi A
Radial velocity (Rv)−0.21±0.82[1] km/s
Proper motion (μ) RA: 578.009(35) mas/yr[1]
Dec.: −59.769(23) mas/yr[1]
Parallax (π)159.6634 ± 0.0341 mas[1]
Distance20.428 ± 0.004 ly
(6.263 ± 0.001 pc)
EQ Pegasi B
Proper motion (μ) RA: 552.349(55) mas/yr[3]
Dec.: 20.275(36) mas/yr[3]
Parallax (π)159.9085 ± 0.0513 mas[3]
Distance20.396 ± 0.007 ly
(6.254 ± 0.002 pc)
Orbit[4]
Period (P)83,664.63 ± 1.98 days (229.0613 ± 0.0054 a)
Semi-major axis (a)5.05797±0.00043"
(31.635±0.033 AU)
Eccentricity (e)0.108047±0.000053
Inclination (i)130.065±0.010°
Longitude of the node (Ω)255.0919±0.0034°
Periastron epoch (T)2,401,891.34±1.19
Argument of periastron (ω)
(secondary)		307.1416±0.0045°
Details
A
Mass0.43599±0.00092[4] M☉
Radius0.35[5] R☉
Luminosity0.019[6] L☉
Temperature3,585[7] K
Rotation1.061 days[5]
B
Mass0.16527±0.00025[4] M☉
Radius0.25[5] R☉
Luminosity0.008[6] L☉
Temperature3,309[8] K
Rotation0.404 days[5]
Other designations
EQ Peg, BD+19°5116, GJ 896, HIP 116132, WDS J23317+1956AB, G 68-24, G 129-19, G 128-71, LFT 1799, LHS 3965, LTT 16919, NLTT 57135[9]
EQ Peg A: TYC 1723-23-1, 2MASS J23315208+1956142[10]
EQ Peg B: LFT 1800, LHS 3966, LTT 16920, NLTT 57136, TYC 1723-23-2, 2MASS J23315244+1956138[10]
Database references
SIMBADThe system
A
B

EQ Pegasi (also known as Gliese 896) is a nearby binary system of two red dwarfs. Both components are flare stars, with spectral types of M4Ve and M6Ve respectively, and a current separation between the components of 5.8 arcseconds. The system is at a distance of 20.4 light-years, and is 950 million years old.[11] The primary star is orbited by one known exoplanet.[4]

  1. ^ a b c d e Cite error: The named reference Gaia DR3 A was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Gaia DR3 B was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Curiel2022 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Morin2008 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference morales was invoked but never defined (see the help page).
  7. ^ 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. ^ 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.
  9. ^ "BD+19 5116". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 August 2017.
  10. ^ a b "BD+19 5116A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 August 2017.
  11. ^ Cite error: The named reference Crosley2018 was invoked but never defined (see the help page).