Capella ABCD

Star type
g A (aka Aa): G5 III
g B (aka Ab): G0 III
g C (aka HL): M2V
g D (aka H): M4 V-V1

Distance from Earth
g 42.2 ly

Star Service No.
g NA

Age
g A: 5.2 billion years; star cooling and expanding on way to becoming red giant
g B: 5.2 billion years; star cooling and expanding on way to becoming red giant
g C: NA
g D: NA

Diameter/Mass/Temp (xSol)
g A: NA; 300%; 4940 K
g B: NA; 280%; 5700 K
g C: NA; 30%; NA
g D: NA; 10%; NA

Brightness (xSol)
g A: 758%
g B: 602%
g C: 1.2%
g D: 0.048%

Metallicity
g A: 40%
g B: 40%
g C: NA
g D: NA

Comparison to Sol
g A: NA
g B: NA
g C: NA
g D: NA

Picture of star
g A: NA
g B: NA
g C: NA
g D: NA

Star system features
g NA

Known planets
g A: NA
g B: NA
g C: NA
g D: NA

Habitable zones
g A: NA
g B: NA
g C: NA
g D: NA

Orbital map
g Star B orbits Star A. Stars C and D orbit one another and as a pair Stars A and B.
g A: NA
g B: NA
g C: NA
g D: NA

View from stars
g NA

Nearby stars
(Star systems with 10 light years)
g NA

Map locating star system
g NA

Location in Earth sky
g In constellation Auriga

Other names
g A: Alpha Aurigae A; Alhajoth, Capella, Hokulei, α Aurigae, α Aur, Alpha Aurigae, Alpha Aur, 13 Aurigae, 13 Aur, ADS 3841 AP, BD+45°1077, CCDM J05168+4559AP, FK5 193, GC 6427, GJ 194, HD 34029, HIP 24608, HR 1708, IDS 05093+4554 AP, LTT 11619, NLTT 14766, PPM 47925, SAO 40186, WDS 05167+4600Aa/Ab
g B: Alpha Aurigae B
g C: Alpha Aurigae C; ADS 3841 HL, CCDM J05168+4559HL, GJ 195 AB, WDS 05167+4600HL
g D: Alpha Aurigae D; G 96-29, LTT 11622, NLTT 14788, PPM 47938

Sci-fi mentions
g A: A habitable planet orbiting Alpha Aurigae climatically is a cold world in Alfred Bester's short story "Fondly Fahrenheit".
g A or B: Home of the Capallens, who were briefly caught up in a cold war struggle between Federation and Klingons in Star Trek: The Original Series episode "Friday's Child"
g B: NA
g C: NA
g D: NA

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