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{{distinguish| text=[[T Andromedae]] }} |
{{distinguish| text=[[T Andromedae]] }} |
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{{short description| |
{{short description|Star in the constellation Andromeda}} |
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| names = {{odlist | B=τ And | F=53 And | BD=+39 378 | HD=10205 | HIP=7818 | HR=477 | SAO=37418 }}<ref name=SIMBAD/> |
| names = {{odlist | B=τ And | F=53 And | BD=+39 378 | HD=10205 | HIP=7818 | HR=477 | SAO=37418 | PPM=44297 }}<ref name=SIMBAD/> |
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| postscript=. | arxiv=0901.1206 | s2cid=18370219 }}</ref> |
| postscript=. | arxiv=0901.1206 | s2cid=18370219 }}</ref> |
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<ref name=clpl4_99>{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref> |
<ref name=clpl4_99>{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref> |
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<ref name=SIMBAD>{{cite simbad | title=* tau And | access-date=2012-06-24 }}</ref> |
<ref name=SIMBAD>{{cite simbad | title=* tau And | access-date=2012-06-24 }}</ref> |
Location of τ Andromedae (circled) | |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Andromeda |
Right ascension | 01h40m 34.81619s[1] |
Declination | +40° 34′ 37.3397″[1] |
Apparent magnitude (V) | +4.94[2] |
Characteristics | |
Spectral type | B5 III[3] |
U−B color index | −0.41[2] |
B−V color index | −0.09[2] |
Astrometry | |
Radial velocity (Rv) | −13.9±2.6[4] km/s |
Proper motion (μ) | RA: 17.889(178)[1] mas/yr Dec.: −20.981(95)[1] mas/yr |
Parallax (π) | 4.7804 ± 0.1304 mas[1] |
Distance | 680 ± 20 ly (209 ± 6 pc) |
Details | |
Luminosity | 851[5] L☉ |
Surface gravity (log g) | 3.357±0.020[6] cgs |
Temperature | 12,680±100[6] K |
Rotational velocity (v sin i) | 74±13[6] km/s |
Age | 217[7] Myr |
Other designations | |
τ And, 53 And, BD+39 378, HD 10205, HIP 7818, HR 477, SAO 37418, PPM 44297[8] | |
Database references | |
SIMBAD | data |
Tau Andromedae, Latinized from τ Andromedae, is the Bayer designation for a single[9] star in the northern constellationofAndromeda. It has an apparent visual magnitude of +4.94,[2] which is bright enough to be viewed from dark suburban skies. From parallax measurements made during the Gaia mission, the distance to this star can be estimated as roughly 680 light-years (210 parsecs) from Earth. The brightness of this star is diminished by 0.24 in magnitude due to extinction caused by intervening gas and dust.[3] It is drifting closer to the Sun with a radial velocity of −14 km/s.[4]
The spectrum of this star matches a stellar classification of B5 III,[3] with the luminosity class of III indicating that this is a giant star. It is radiating about 851 times the luminosity of the Sun[5] from its photosphere at an effective temperature of 12,670 K.[6] The star is an estimated 217[7] million years old and is spinning with a high projected rotational velocity of ~74 km/s.[6]
InChinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of τ Andromedae, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, the Chinese name for τ Andromedae itself is 天大將軍七 (Tiān Dà Jiāng Jūn qī, English: the Seventh Star of Heaven's Great General.).[10]
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