Theta Aquarii

"Ancha" redirects here. Not to be confused with Ankaa.
θ Aquarii
Location of θ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 16m 50.03635s[1]
Declination –07° 46′ 59.8480″[1]
Apparent magnitude (V) 4.175[2]
Characteristics
Spectral type G8 III–IV[3]
U−B color index +0.818[2]
B−V color index +0.983[2]
Astrometry
Radial velocity (Rv)–13.77 ± 0.17[4] km/s
Proper motion (μ) RA: +118.80[1] mas/yr
Dec.: –22.18[1] mas/yr
Parallax (π)17.40 ± 0.23 mas[1]
Distance187 ± 2 ly
(57.5 ± 0.8 pc)
Absolute magnitude (MV)+0.23[3]
Details
Mass2.39[5] to 2.78[3] M☉
Radius12[4] R☉
Luminosity72[4] to 83[3] L☉
Surface gravity (log g)2.8[4] cgs
Temperature4,864[4] K
Metallicity [Fe/H]+0.01[4] to +0.09[3] dex
Rotational velocity (v sin i)1.6[4] km/s
Age437[3] Myr
Other designations
Ancha, 43 Aquarii, BD–08 5845, FK5 840, HD 211391, HIP 110003, HR 8499, SAO 145991.[6]
Database references
SIMBADdata

Theta Aquarii (θ Aquarii, abbreviated Theta Aqr, θ Aqr), officially named Ancha /ˈæŋkə/[7] (distinguish Ankaa, with the same pronunciation), is a star in the equatorial constellation of Aquarius. Visible to the naked eye at apparent magnitude 4.175,[2] it is located at a distance of around 187 light-years (57 parsecs) from the Sun.[1] Since it is near the ecliptic it can be occulted by the Moon, or very rarely by planets.

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference sps1966 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference pasj60_4_781 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.