Back Ípsilon Carinae AST Upsilon Carinae BS Ípsilon de la Quilla Catalan Ípsilon Carinae Spanish اوپسیلون شاه‌تخته Persian Upsilon Carinae French אופסילון בשדרית HE Upsilon Carinae ID Upsilon Carinae Italian りゅうこつ座ウプシロン星 Japanese

Upsilon Carinae

Not to be confused with Y Carinae.
υ Carinae
Location of υ Carinae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 09h 47m 06.12170s[1]
Declination −65° 04′ 19.2267″[1]
Apparent magnitude (V) 2.97[2] (+3.08/+6.25[3])
Characteristics
Spectral type A8 Ib + B7 III[4]
U−B color index +0.13[2]
B−V color index +0.27[2]
Astrometry
Radial velocity (Rv)+14[4] km/s
Proper motion (μ) RA: −11.51[1] mas/yr
Dec.: +4.71[1] mas/yr
Parallax (π)2.27±0.28 mas[1]
Distanceapprox. 1,400 ly
(approx. 440 pc)
Absolute magnitude (MV)−5.26[5]
Details
υ Car A
Mass10.88[6] M☉
Radius96.6 – 100[6] R☉
Surface gravity (log g)1.4±0.1[6] cgs
Temperature7,500±100[6] K
Age23.4[6] Myr
υ Car B
Mass8[4] M☉
Surface gravity (log g)3.3±0.1[4] cgs
Temperature23,000±1,600[4] K
Other designations
υ Car, CP−64°1084, HIP 48002[7]
A: HD 85124, HR 3890, SAO 250696
B: HD 85123, HR 3891, SAO 250695
Database references
SIMBADsystem
A
B

Upsilon Carinae, Latinized from υ Carinae, is a double star in the southern constellation of Carina. It is part of the Diamond Cross asterism in southern Carina. The Upsilon Carinae system has a combined apparent magnitude of +2.97[2] and is approximately 1,400 light years (440 parsecs) from Earth.[1]

In Chinese, 海石 (Hǎi Dàn), meaning Sea Rock, refers to an asterism consisting of υ Carinae, ε Carinae, ι Carinae, HD 83183 and HD 84810.[8] Consequently, υ Carinae itself is known as 海石五 (Hǎi Dàn wǔ, English: the Fifth Star of Sea Rock.)[9]

The primary component, υ Carinae A, has a stellar classification of A8 Ib, making it a supergiant star that has exhausted the hydrogen at its core and evolved away from its brief main sequence lifetime as an B-type star.[6] With an apparent magnitude of +3.08,[3] it has an effective temperature of about 7,500 K,[6] giving it a white hue. The companion, υ Carinae B, is a giant star with a classification of B7 III,[3] although Mandrini and Niemela (1986) suggested it may be a subgiant star with a classification of B4–5 IV.[4] The outer envelope of this star has an effective temperature of around 23,000 K, resulting in the blue-white hue of a B-type star.

The two stars have an angular separation of 5.030 arcseconds. As a binary star system, they would have an estimated orbital period of at least 19,500 years and a present-day separation of around 2,000 Astronomical Units.[4] This system is roughly 12 million years old.[10]

In the next 7500 years, the south Celestial pole will pass close to these stars and Iota Carinae (8100 CE).[11]

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  6. ^ a b c d e f g Cite error: The named reference Neiner2017 was invoked but never defined (see the help page).
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  11. ^ Cite error: The named reference moonkmft was invoked but never defined (see the help page).
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