Eta Pegasi information

Eta Pegasi
	Location of η Pegasi (circled) near the center
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Pegasus
Right ascension	22h 43m 00.13743s
Declination	+30° 13′ 16.4822″
Apparent magnitude (V)	+2.95
Characteristics
Spectral type	G2 II + F0 V
U−B color index	+0.57
B−V color index	+0.86
Astrometry
Radial velocity (Rv)	+4.3 km/s
Proper motion (μ)	RA: +13.16 mas/yr ; Dec.: -25.67 mas/yr
Parallax (π)	16.6308 ± 0.7047 mas
Distance	196 ± 8 ly ; (60 ± 3 pc)
Absolute magnitude (MV)	–1.18
Orbit
Period (P)	813 days
Eccentricity (e)	0.183
Periastron epoch (T)	2452025 HJD
Argument of periastron (ω); (secondary)	344.7°
Semi-amplitude (K1); (primary)	14.37 km/s
Details
η Peg A
Mass	3.51±0.13 M☉
Radius	24.51+1.11; −1.21 R☉
Luminosity	330.8±35.0 L☉
Surface gravity (log g)	2.40 cgs
Temperature	4970±65 K
Metallicity [Fe/H]	+0.39 dex
Rotation	818
Rotational velocity (v sin i)	1.4 km/s
Age	0.27±0.03 Gyr
Other designations
	Matar, Eta Peg, η Peg, 44 Peg, BD+29° 4741, FK5 857, HD 215182, HIP 112158, HR 8650, SAO 90734
Database references
SIMBAD	data

Eta Pegasi or η Pegasi, formally named Matar /ˈmeɪtɑːr/,^[11]^[12] is a binary star in the constellation of Pegasus. The apparent visual magnitude of this star is +2.95,^[2] making it the fifth-brightest member of Pegasus. Based upon parallax measurements, the distance to this star is about 214 light-years (66 parsecs) from the Sun.^[1]

^ ^a ^b ^c ^d ^e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
^ Cite error: The named reference apjss119_1_83 was invoked but never defined (see the help page).
^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Baines2018 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aj110_2425 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.

[aaa474_2_653-1] Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).

[clpl4_99-2] Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).

[apjss119_1_83-3] Cite error: The named reference apjss119_1_83 was invoked but never defined (see the help page).

[gcsrv-4] Cite error: The named reference gcsrv was invoked but never defined (see the help page).

[Gaia3-5] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[aaa361_614-6] Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).

[aj135_1_209-7] Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).

[Baines2018-8] Cite error: The named reference Baines2018 was invoked but never defined (see the help page).

[aj110_2425-9] Cite error: The named reference aj110_2425 was invoked but never defined (see the help page).

[SIMBAD-10] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Kunitzsch-11] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[IAU-CSN-12] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000.0 Equinox J2000.0
Location of η Pegasi (circled) near the center
Constellation	Pegasus
Right ascension	22^h 43^m 00.13743^s^[1]
Declination	+30° 13′ 16.4822″^[1]
Apparent magnitude (V)	+2.95^[2]
Characteristics
Spectral type	G2 II + F0 V^[3]
U−B color index	+0.57^[2]
B−V color index	+0.86^[2]
Astrometry

Radial velocity (R_v)	+4.3^[4] km/s
Proper motion (μ)	RA: +13.16^[1] mas/yr Dec.: -25.67^[1] mas/yr
Parallax (π)	16.6308 ± 0.7047 mas^[5]
Distance	196 ± 8 ly (60 ± 3 pc)
Absolute magnitude (M_V)	–1.18^[6]

Orbit^[7]
Period (P)	813 days
Eccentricity (e)	0.183
Periastron epoch (T)	2452025 HJD
Argument of periastron (ω) (secondary)	344.7°
Semi-amplitude (K₁) (primary)	14.37 km/s
Details
η Peg A
Mass	3.51±0.13^[8] `M`_☉
Radius	24.51+1.11 −1.21^[8] `R`_☉
Luminosity	330.8±35.0^[8] `L`_☉
Surface gravity (log g)	2.40^[9] cgs
Temperature	4970±65^[8] K
Metallicity [Fe/H]	+0.39^[9] dex
Rotation	818^[6]
Rotational velocity (v sin i)	1.4^[7] km/s
Age	0.27±0.03^[8] Gyr

Other designations
Matar, Eta Peg, η Peg, 44 Peg, BD+29° 4741, FK5 857, HD 215182, HIP 112158, HR 8650, SAO 90734^[10]
Database references
SIMBAD	data

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