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γ¹ Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 53m 31.8s
Declination +19° 17′ 45.0″
Apparent magnitude (V) 4.7
Characteristics
Spectral type B9V
Astrometry
Radial velocity (Rv) 3.7 km/s
Proper motion (μ) RA: 79 mas/yr
Dec.: -112 mas/yr
Parallax (π) 21 ± 5 mas
Distance approx. 160 ly
(approx. 50 pc)
Absolute magnitude (MV) 4.8
Details
Rotation 152 Km/s
Orbit
Companion Gamma Arietis B
Period (P) 5000 yr
Semimajor axis (a) 7.5"
Inclination (i)
Orbit
Companion Gamma Arietis C
Semimajor axis (a) 221.3"
Inclination (i) 84°
Other designations
HD 11502, BD+18° 243B, GCRV 1053, SAO 92680, 5 Ari B, CCDM J01536+1918B, HGAM 94, Gamma01 Arietis, CSI+18 243 1, HR 545, ADS 1507 B, GC 2290, ROT 265.
Database references
SIMBAD data
ARICNS data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Gamma Arietis (γ Ari / γ Arietis) is a triple star system, 204 light years distant, in constellation Aries. It has the traditional name Mesarthim, of obscure origin, and has been called "the First Star in Aries" as having been at one time the nearest visible star to the equinoctial point.

The system includes a binary star with components separated with an angular distance of 7.7 arcseconds (separable in small telescopes). Both components are white A-type main sequence stars and have apparent magnitudes of +4.75 and +4.83. The brighter is known as γ² Arietis and the dimmer γ¹ Arietis. The orbital period of the binary is greater than 5000 years. Orbiting the binary is γ Arietis C, a magnitude +9.6 K-type star located 221 arcseconds distant.

Robert Hooke discovered that Gamma Arietis was made of multiple stars in 1664.[1]

Aries Constellation

γ2 Arietis

γ2 Arietis

γ2 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 53m 31.83s
Declination +19° 17′ 37.2″
Apparent magnitude (V) 4.64
Characteristics
Spectral type A1p
U-B color index -0.13
B-V color index -0.04
R-I color index -0.05
Variable type Alpha² CVn variable
Astrometry
Radial velocity (Rv) -0.6 km/s
Proper motion (μ) RA: 80 mas/yr
Dec.: -104 mas/yr
Parallax (π) 21 ± 5 mas
Distance approx. 160 ly
(approx. 50 pc)
Absolute magnitude (MV) 4.71
Details
Mass 3,1 M
Radius 2,1 R
Luminosity 40 L
Temperature 7,500–10,000 K
Rotation 63 Km/s
Other designations
Mesarthim, Mesartim, V* Gamma Arietis, CCDM J01536+1918A, HD 11503, ROT 266, Gamma02 Arietis, CEL 179, HGAM 95, SAO 92681, 5 Ari A, CSI+18 243 2, HR 546, ADS 1507 A, GC 2291, N30 390, YPAC 282, BD+18 243A, GCRV 1054, PLX 391.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

The brightest component, γ² Arietis, is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies by 0.04 magnitudes with a period of 2.61 days.

References

  1. ^ Aitken, Robert G. (1935). The Binary Stars. New York: McGraw-Hill. pp. 1.  

Components

NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
ADS 1507 B (ADS 1507 AB) 01h 53m 31.8143s +19° 17' 37.866 3.88 A0 Simbad
ADS 1507 C 01h 09m 35.334s +35° 36' 24.4 12.9 Simbad
ADS 1507 D 01h 09m 47s +35° 36' 14 12.1 Simbad
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