42 Aquarii

42 Aquarii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 22h 16m 48.04643s[1]
Declination −12° 49′ 53.1673″[1]
Apparent magnitude (V) 5.34[2]
Characteristics
Evolutionary stage giant
Spectral type K1 III[3]
B−V color index 1.132±0.001[2]
Astrometry
Radial velocity (Rv)+13.0±4.2[2] km/s
Proper motion (μ) RA: +1.89[4] mas/yr
Dec.: +5.03[4] mas/yr
Parallax (π)7.3032 ± 0.1451 mas[1]
Distance447 ± 9 ly
(137 ± 3 pc)
Absolute magnitude (MV)−0.93[2]
Details
Mass3.14±0.27[5] M☉
Radius11.24+0.23
−0.32[1] R☉
Luminosity69.950±3.907[1] L☉
Surface gravity (log g)2.90[6] cgs
Temperature4,980+71
−51[1] K
Metallicity [Fe/H]+0.00±0.04[2] dex
Rotational velocity (v sin i)3.43[6] km/s
Age470±150[5] Myr
Other designations
42 Aqr, BD−13°6148, HD 211361, HIP 110000, HR 8496, SAO 164974[7]
Database references
SIMBADdata

42 Aquarii is a single[8] star located 447 light years away from the Sun in the zodiac constellation of Aquarius. 42 Aquarii is its Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.34.[2] This object is moving further from the Sun with a heliocentric radial velocity of around +13 km/s.[2]

This object is an evolved giant star with a stellar classification of K1 III,[3] most likely (82% chance) on the horizontal branch.[5] It is around 470[5] million years old with a projected rotational velocity of 3.4 km/s.[6] The star has over three[5] times the mass of the Sun and has expanded to 11[1] times the Sun's radius. It is radiating 70[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,980 K.[1]

  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 Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference reffert2015 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference hekker2007 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).