77 Aquarii

77 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 54m 45.47009s[1]
Declination –16° 16′ 19.0505″[1]
Apparent magnitude (V) 5.55[2]
Characteristics
Evolutionary stage giant
Spectral type K1 III[3]
U−B color index +1.089[2]
B−V color index +1.104[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−34.59±0.16[1] km/s
Proper motion (μ) RA: –222.505[1] mas/yr
Dec.: –88.355[1] mas/yr
Parallax (π)24.1777 ± 0.1211 mas[1]
Distance134.9 ± 0.7 ly
(41.4 ± 0.2 pc)
Absolute magnitude (MV)2.46[5]
Details
Mass1.14[6] M☉
Radius5.79+0.22
−0.21[1] R☉
Luminosity13.347±0.085[1] L☉
Surface gravity (log g)2.8[7] cgs
Temperature4,583+86
−83[1] K
Metallicity [Fe/H]+0.03[7] dex
Rotational velocity (v sin i)3.9[7] km/s
Age7.61[6] Gyr
Other designations
70 Aqr, NSV 14358, BD−17°6619, HD 216640, HIP 113148, HR 8711, SAO 165376[8]
Database references
SIMBADdata

77 Aquarii is a single[9] star located 135 light years away from the Sun in the equatorial constellation of Aquarius. 77 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim star with a baseline apparent visual magnitude of 5.55.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −35 km/s.[1]

At the estimated age of 7.61[6] billion years old, this is an aging giant star with a stellar classification of K1 III.[3] It is a suspected variable star that ranges in brightness from a maximum of magnitude 5.53 down to 5.60.[4] 77 Aquarii has 1.14[6] times the mass of the Sun and, after exhausting the hydrogen at its core, has expanded to six times the Sun's radius. It is radiating 13.3[1] times the Sun's luminosity from its photosphere at an effective temperature of 4,581 K,[7] giving it the orange-hued glow of a K-type star.[10]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference mnras172_667 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 Samus2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Wittenmyer2016 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).