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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]

EQ Pegasi
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 52.173851s[1]
Declination +19° 56′ 14.130398″[1]
Apparent magnitude (V) 10.38 (min)[2]
EQ Pegasi B
Right ascension 23h 31m 52.575338s[3]
Declination +19° 56′ 14.005026″[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±0.035 mas/yr[1]
Dec.: −59.769±0.023 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±0.055 mas/yr[3]
Dec.: 20.275±0.036 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☉
Luminosity0.019[5] L☉
Temperature3,585[6] K
B
Mass0.16527±0.00025[4] M☉
Luminosity0.008[5] L☉
Temperature3,309[7] K
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[8]
EQ Peg A: TYC 1723-23-1, 2MASS J23315208+1956142[9]
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

Discovery


EQ Pegasi was first noticed to be a binary star by Carl A. Wirtanen who in the course of a systematic survey of the McCormick Observatory photographic plates for M-type dwarfs, detected a companion about two magnitudes fainter at a separation of 3.5 arcseconds.[12]

Both components are also thought to be single-lined spectroscopic binaries, with faint companions that have not been resolved in orbits of a few years.[13]


Planetary system


In 2022, a Jovian planet was discovered in orbit around the system's primary star via radio astrometry. Along with the planet around TVLM 513-46546, this is the first confirmed exoplanet discovered entirely using astrometry.[4]

The Gliese 896 A planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.26±0.57 MJ 0.64282±0.00068 284.39±1.47 0.35±0.19 69.20±25.61° —

In culture


In 1998, it was the basis of a hoax, as a telecommunications company claimed it had discovered "alien" signals originating from the star.[14]



  • A visual band light curve for EQ Pegasi A, adapted from Norton et al. (2007)[15]
    A visual band light curve for EQ Pegasi A, adapted from Norton et al. (2007)[15]
  • An ultraviolet band light curve for a flare on EQ Pegasi B, adapted from Mathioudakis et al. (2006)[16]
    An ultraviolet band light curve for a flare on EQ Pegasi B, adapted from Mathioudakis et al. (2006)[16]

References


  1. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  3. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  4. Curiel, Salvador; Ortiz-León, Gisela N.; Mioduszewski, Amy J.; Sanchez-Bermudez, Joel (September 2022). "3D Orbital Architecture of a Dwarf Binary System and Its Planetary Companion". The Astronomical Journal. 164 (3): 93. arXiv:2208.14553. Bibcode:2022AJ....164...93C. doi:10.3847/1538-3881/ac7c66.
  5. Morales, J. C.; Ribas, I.; Jordi, C. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2): 507. arXiv:0711.3523. Bibcode:2008A&A...478..507M. doi:10.1051/0004-6361:20078324. S2CID 16238033.
  6. 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.
  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. "BD+19 5116". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 August 2017.
  9. "BD+19 5116A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 August 2017.
  10. "BD+19 5116A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 August 2017.
  11. Crosley, M. K.; Osten, R. A. (2018). "Constraining Stellar Coronal Mass Ejections through Multi-wavelength Analysis of the Active M Dwarf EQ Peg". The Astrophysical Journal. 856 (1). 39. arXiv:1802.03440. Bibcode:2018ApJ...856...39C. doi:10.3847/1538-4357/aaaec2. S2CID 55448675.
  12. Wirtanen, C. A. (1941). "A New dMe Double Star". Publications of the Astronomical Society of the Pacific. 53 (316): 340. Bibcode:1941PASP...53..340W. doi:10.1086/125371.
  13. Tokovinin, A. "Multiple Star Catalog". Retrieved 2019-08-12.
  14. "BBC News | Sci/Tech | Alien hoax dismays scientists". news.bbc.co.uk. Retrieved 2018-09-25.
  15. Norton, A. J.; Wheatley, P. J.; West, R. G.; Haswell, C. A.; Street, R. A.; Collier Cameron, A.; Christian, D. J.; Clarkson, W. I.; Enoch, B.; Gallaway, M.; Hellier, C.; Horne, K.; Irwin, J.; Kane, S. R.; Lister, T. A.; Nicholas, J. P.; Parley, N.; Pollacco, D.; Ryans, R.; Skillen, I.; WilsonD. M. (May 2007). "New periodic variable stars coincident with ROSAT sources discovered using SuperWASP". Astronomy and Astrophysics. 467 (2): 785–905. arXiv:astro-ph/0702631. Bibcode:2007A&A...467..785N. doi:10.1051/0004-6361:20077084. S2CID 16358048. Retrieved 11 February 2022.
  16. Mathioudakis, M.; Bloomfield, D. S.; Jess, D. B.; Dhillon, V. S.; Marsh, T. R. (September 2006). "The periodic variations of a white-light flare observed with ULTRACAM". Astronomy and Astrophysics. 456 (1): 323–327. arXiv:astro-ph/0605196. Bibcode:2006A&A...456..323M. doi:10.1051/0004-6361:20054752. S2CID 8572363. Retrieved 12 February 2022.

На других языках

- [en] EQ Pegasi

[es] EQ Pegasi

EQ Pegasi (EQ Peg / GJ 896 / HIP 116132)[1] es un sistema estelar en la constelación de Pegaso. Situado a 20,7 años luz de distancia, es uno de los 100 sistemas más cercanos al sistema solar.[2] La estrella conocida más cercana a este sistema es Gliese 880, a 3,96 años luz de distancia.[3]

[ru] EQ Пегаса

EQ Пегаса (EQ Pegasi, сокращ. EQ Peg) — кратная звезда северного полушария в созвездии Пегас. Звезда имеет видимую звёздную величину +10,165m[2], звезда не видна невооружённым глазом.


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