30 Aquarii

30 Aquarii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 22h 03m 16.45803s[1]
Declination −06° 31′ 20.6748″[1]
Apparent magnitude (V) 5.558[2]
Characteristics
Evolutionary stage giant
Spectral type K1 IV[3] or G8 III[4]
B−V color index 0.951[2]
Variable type Constant[5]
Astrometry
Radial velocity (Rv)39.74[2] km/s
Proper motion (μ) RA: +45.635[1] mas/yr
Dec.: +8.681[1] mas/yr
Parallax (π)10.8432 ± 0.3325 mas[1]
Distance301 ± 9 ly
(92 ± 3 pc)
Absolute magnitude (MV)0.88[6]
Details
Mass2.01[2] M☉
Radius9.86+0.23
−0.25[1] R☉
Luminosity54.7±1.9[1] L☉
Surface gravity (log g)2.860[7] cgs
Temperature4,944±79[2] K
Metallicity [Fe/H]−0.11[7] dex
Rotational velocity (v sin i)1.6[8] km/s
Age1.98[2] Gyr
Other designations
30 Aqr, BD−07°5688, HD 209396, HIP 108868, HR 8401, SAO 145836[9]
Database references
SIMBADdata

30 Aquarii is a single[10] star located about 301 light years away from the Sun in the zodiac constellation of Aquarius. 30 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.56.[2] The star is moving further from the Earth with a heliocentric radial velocity of 40 km/s.[2]

This object is an aging G-type giant star[6][5] with a stellar classification of G8 III,[4] although Houk and Swift (1999) found a class of K1 IV.[3] It is a red clump giant,[6] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is nearly two[2] billion years old with a leisurely rotation rate, showing a projected rotational velocity of 1.6 km/s.[8] It has double[2] the mass of the Sun and has expanded to ten[1] times the Sun's radius. The star is radiating 55[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,944 K.[2]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Henry2000 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).