Theta Andromedae

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Theta Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
Cercle rouge 100%.svg

Location of θ Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 17m 05.49885s[1]
Declination +38° 40′ 53.8902″[1]
Apparent magnitude (V) 4.61[2]
Characteristics
Spectral type A2 V[3]
U−B color index +0.05[2]
B−V color index +0.06[2]
Astrometry
Radial velocity (Rv) 0.9[4] km/s
Proper motion (μ) RA: –49.35[1] mas/yr
Dec.: -17.65[1] mas/yr
Parallax (π) 10.56 ± 0.96[1] mas
Distance 310 ± 30 ly
(95 ± 9 pc)
Orbit[5]
Period (P) 1033+91
−77 days
Semi-major axis (a) 25+32
−13 mas
Eccentricity (e) 0.95+0.04
−0.40
Inclination (i) 69+8
−22°
Longitude of the node (Ω) 263+50
−156°
Periastron epoch (T) 238+343
−143
Argument of periastron (ω)
(secondary)		 89+175
−29°
Details
Surface gravity (log g) 3.95[6] cgs
Temperature 8960[6] K
Metallicity [Fe/H] +0.14[6] dex
Rotational velocity (v sin i) 102[7] km/s
Other designations
24 Andromedae, BD+37°34, HD 1280, HIP 1366, HR 63, SAO 53777.
Database references
SIMBAD data

Theta Andromedae (θ And, θ Andromedae) is the Bayer designation for a binary star in the constellation Andromeda. It is approximately 310 light-years (95 parsecs) from Earth,[1] with a visual magnitude of 4.6.[2] On the Bortle Dark-Sky Scale, this makes it visible to the naked eye from outside urban regions.

Theta Andromedae is a white A-type main sequence dwarf with an apparent magnitude of +4.61. It appears to be a binary star with a massive, possibly A-type secondary orbiting at a distance of around 1 astronomical unit.[5] A fainter companion is separated from Theta Andromedae by 0.06 arcseconds.[8]

Naming

In Chinese, 天廄 (Tiān Jiù), meaning Celestial Stable, refers to an asterism consisting of θ Andromedae, ρ Andromedae and σ Andromedae. Consequently, θ Andromedae itself is known as 天廄一 (Tiān Jiù yī, English: the First Star of Celestial Stable.)[9]

References

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External links


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  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
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  6. ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
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  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 日
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