Gamma Corvi information

Gamma Corvi
	Location of γ Crv (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Corvus
Right ascension	12h 15m 48.37081s
Declination	–17° 32′ 30.9496″
Apparent magnitude (V)	2.585
Characteristics
Spectral type	B8 III
U−B color index	–0.344
B−V color index	–0.111
Astrometry
Radial velocity (Rv)	-4.2 km/s
Proper motion (μ)	RA: –158.61 mas/yr ; Dec.: +21.86 mas/yr
Parallax (π)	21.23 ± 0.20 mas
Distance	154 ± 1 ly ; (47.1 ± 0.4 pc)
Absolute magnitude (MV)	−0.79
Details
γ Crv A
Mass	4.2+0.4; −0.3 M☉
Radius	4.026 R☉
Luminosity	331 L☉
Temperature	12,000 K
Rotational velocity (v sin i)	30 km/s
Age	160+40; −30 Myr
γ Crv B
Mass	0.8 M☉
Other designations
	4 Corvi, BD–16 3424, FK5 457, HD 106625, HIP 59803, HR 4662, SAO 157176.
Database references
SIMBAD	data

Gamma Corvi (γ Corvi, abbreviated Gamma Crv, γ Crv) is a binary star and the brightest star in the southern constellation of Corvus, having an apparent visual magnitude of 2.59.^[12] The system's two components are designated Gamma Corvi A (officially named Gienah /ˈdʒiːnə/, traditionally the name of the system)^[13]^[14] and Gamma Corvi B, whose magnitude is 9.7 and which is 1.1 arcseconds away from Gamma Corvi A.^[15] The distance to this system has been measured directly using the parallax technique, yielding an estimated 154 light-years (47 parsecs) from the Sun.^[1]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
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^ Cite error: The named reference apj573_1 was invoked but never defined (see the help page).
^ Cite error: The named reference aj133_2_545 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Kaler, James B. (Jim) (2004), "Gienah Corvi", Stars, University of Illinois, retrieved 18 March 2015
^ 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.
^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
^ "WDS 12158-1733 RBR 5 (Gienah)". www.stelledoppie.it. Retrieved 2024-02-01.

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[aaa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).

[csaao8-2] Cite error: The named reference csaao8 was invoked but never defined (see the help page).

[houk1978-3] Cite error: The named reference houk1978 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).

[Anderson2012-5] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[apj736_2_89-6] Cite error: The named reference apj736_2_89 was invoked but never defined (see the help page).

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[aaa320_580-9] Cite error: The named reference aaa320_580 was invoked but never defined (see the help page).

[apj573_1-10] Cite error: The named reference apj573_1 was invoked but never defined (see the help page).

[aj133_2_545-11] Cite error: The named reference aj133_2_545 was invoked but never defined (see the help page).

[SIMBAD-12] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[kalergamma-13] Kaler, James B. (Jim) (2004), "Gienah Corvi", Stars, University of Illinois, retrieved 18 March 2015

[Kunitzsch-14] 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-LSN-15] "Naming Stars". IAU.org. Retrieved 16 December 2017.

[16] "WDS 12158-1733 RBR 5 (Gienah)". www.stelledoppie.it. Retrieved 2024-02-01.

Observation data Epoch J2000 Equinox J2000
Location of γ Crv (circled)
Constellation	Corvus
Right ascension	12^h 15^m 48.37081^s^[1]
Declination	–17° 32′ 30.9496″^[1]
Apparent magnitude (V)	2.585^[2]
Characteristics
Spectral type	B8 III^[3]
U−B color index	–0.344^[2]
B−V color index	–0.111^[2]
Astrometry

Radial velocity (R_v)	-4.2^[4] km/s
Proper motion (μ)	RA: –158.61^[1] mas/yr Dec.: +21.86^[1] mas/yr
Parallax (π)	21.23 ± 0.20 mas^[1]
Distance	154 ± 1 ly (47.1 ± 0.4 pc)
Absolute magnitude (M_V)	−0.79^[5]

Details
γ Crv A
Mass	4.2+0.4 −0.3^[6] `M`_☉
Radius	4.026^[7]^[a] `R`_☉
Luminosity	331^[5] `L`_☉
Temperature	12,000^[8] K
Rotational velocity (v sin i)	30^[9] km/s
Age	160+40 −30^[6] Myr
γ Crv B
Mass	0.8^[10] `M`_☉
Other designations
4 Corvi, BD–16 3424, FK5 457, HD 106625, HIP 59803, HR 4662, SAO 157176.^[11]
Database references
SIMBAD	data

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