15 Aquarii

15 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 18m 11.07309s[1]
Declination −04° 31′ 10.1276″[1]
Apparent magnitude (V) 5.83[2]
Characteristics
Spectral type B7 III[3] or B5 V[4]
B−V color index −0.130±0.005[2]
Astrometry
Radial velocity (Rv)−9.0±1.0[5] km/s
Proper motion (μ) RA: +12.11[6] mas/yr
Dec.: +12.94[6] mas/yr
Parallax (π)4.5632 ± 0.1345 mas[1]
Distance710 ± 20 ly
(219 ± 6 pc)
Absolute magnitude (MV)−1.62[2]
Details
Mass5.7±0.2[7] M☉
Radius3.4[8] R☉
Luminosity821.67[2] L☉
Surface gravity (log g)3.84[9] cgs
Temperature14,318[9] K
Rotational velocity (v sin i)20[10] km/s
Age65.2±25.1[7] Myr
Other designations
BD−05° 5512, HD 202753, HIP 105164, HR 8141, SAO 145278[11]
Database references
SIMBADdata

15 Aquarii, abbreviated 15 Aqr, is a single,[12] blue-white star in the zodiac constellation of Aquarius. 15 Aquarii is the Flamsteed designation. It is a dim star that is just visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.83.[2] Based upon an annual parallax shift of 4.6 mas,[1] it is located around 710 light years away. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust.[13] It is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[5] Relative to its neighbors, 15 Aqr has a peculiar velocity of 28.7+2.9
−3.1 km/s and may (62% chance) be a runaway star.[7]

Hube (1970) found a stellar classification of B7 III[3] for this star, which would suggest it is a B-type giant star. However, the Bright Star Catalogue (1964) listed it as a B-type main-sequence star with a class of B5 V,[4] and multiple sources use this instead.[7][10][8][9] The star is roughly 65[7] million years old with a projected rotational velocity of 20 km/s.[10] It has an estimated 5.7[7] times the mass of the Sun and about 3.4[8] times the Sun's radius. 15 Aquarii is radiating 822[2] times the Sun's luminosity from its photosphere at an effective temperature of 14,318 K.[9]

  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Hube1970 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Hoffleit1964 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Pasinetti2001 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Takeda2010 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Strom2005 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).