7 Trianguli

7 Trianguli
Location of 7 Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 02h 15m 56.2876s[1]
Declination +33° 21′ 32.032″[1]
Apparent magnitude (V) 5.25±0.01[2]
Characteristics
Spectral type A0 V[3] or B9.5 V[4]
U−B color index −0.03[5]
B−V color index −0.01[5]
Astrometry
Radial velocity (Rv)−1.3±2[6] km/s
Proper motion (μ) RA: −15.234[1] mas/yr
Dec.: −32.711[1] mas/yr
Parallax (π)9.0683 ± 0.137 mas[1]
Distance360 ± 5 ly
(110 ± 2 pc)
Absolute magnitude (MV)0.58[7]
Details
Mass2.77[8] M☉
Radius3.24±0.11[9] R☉
Luminosity89.1+10.5
−8.1[9] L☉
Surface gravity (log g)4.02±0.14[8] cgs
Temperature10685±363[8] K
Rotational velocity (v sin i)130[10] km/s
Age283[8] Myr
Other designations
7 Trianguli, AG+33° 210, BD+32° 409, GC 2710, HD 13869, HIP 10559, HR 655, SAO 55397
Database references
SIMBADdata

7 Trianguli is a solitary[11] star located in the northern constellation Triangulum. It has an apparent magnitude of 5.25,[2] making it faintly visible to the naked eye under ideal conditions. The star is situated at distance of 360 light years[1] but is approaching with a heliocentric radial velocity of −1.3 km/s,[6] which is poorly constrained.

7 Trianguli has a stellar classification of A0 V[3] or B9.5 V,[4] depending on the study. At present it has 2.77 times the mass of the Sun[8] and 3.24 times the radius of the Sun.[9] It shines at 89.1 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 10,685 K,[8] giving it a blueish white glow. 7 Trianguli is a young star, with an age of 283 million years[8] and spins rapidly with a projected rotational velocity of 130 km/s.[10] It has been classified as having a peculiar spectrum,[12] but it is considered doubtful that it is actually a chemically peculiar star.[13]

Together with δ Trianguli and γ Trianguli, it forms an optical (line-of-sight) triple.

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggen1962 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hamdy1993 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Glebocki2000 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference cucchiaro1980 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference renson2009 was invoked but never defined (see the help page).