HD 201298

HD 201298
Location of HD 201298 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 08m 28.1388s[1]
Declination +06° 59′ 21.6948″[1]
Apparent magnitude (V) 6.14[2]
Characteristics
Evolutionary stage red giant branch?[3]
Spectral type M0 III[4]
U−B color index +1.97[5]
B−V color index +1.66[5]
Astrometry
Radial velocity (Rv)20 ± 2[6] km/s
Proper motion (μ) RA: −10.643 mas/yr[1]
Dec.: +2.479 mas/yr[1]
Parallax (π)2.8646 ± 0.0533 mas[1]
Distance1,140 ± 20 ly
(349 ± 6 pc)
Absolute magnitude (MV)−1.57[note 1]
Details
Mass1.83[7] M☉
Radius117[7] R☉
Luminosity1,648[8] L☉
Surface gravity (log g)0.413[9] cgs
Temperature3,732[8] K
Rotational velocity (v sin i)4.5 ± 1[10] km/s
Other designations
12 G. Equueli, AG+06°2888, BD+06°4754, FK5 3692, GC 29548, HD 201298, HIP 104357, HR 8090, SAO 126566[11][12]
Database references
SIMBADdata

HD 201298 (HR 8090) is a solitary star located in the northern constellation Equuleus just next to 3 Equulei It has an apparent magnitude of 6.14,[2] making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years[1] but is drifting away with a heliocentric radial velocity of 20 km/s.[6]

HD 201298 has a stellar classification of M0 III, indicating that it is ageing M-type star[4] that is probably on the red giant branch.[3] As a result, it has expanded to 117 times the Sun's girth.[7] At present it has 1.83 times the mass of the Sun[7] and shines with a luminosity of 1,648 L☉ from its enlarged photosphere at an effective temperature of 3,732 K,[8] which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5±1 km/s,[10] slightly faster than most giants.

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gontcharov2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Henry2000 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference deMed1999 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 Gould1879 was invoked but never defined (see the help page).


Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).