HD 290327

HD 290327
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 05h 23m 21.5637s[1]
Declination –02° 16′ 39.433″[1]
Apparent magnitude (V) 8.99[2]
Characteristics
Spectral type G5IV[3] or G8V[4]
Apparent magnitude (B) 9.751[2]
Apparent magnitude (J) 7.683±0.026[2]
Apparent magnitude (H) 7.404±0.047[2]
Apparent magnitude (K) 7.271±0.027[2]
B−V color index 0.761±0.033[2]
Astrometry
Radial velocity (Rv)+29.52±0.17[1] km/s
Proper motion (μ) RA: 32.478(19) mas/yr[1]
Dec.: −97.255(13) mas/yr[1]
Parallax (π)17.9008 ± 0.0196 mas[1]
Distance182.2 ± 0.2 ly
(55.86 ± 0.06 pc)
Absolute magnitude (MV)5.24[2]
Details[5]
Mass0.86±0.01 M☉
Radius0.95±0.02 R☉
Luminosity0.747±0.004 L☉
Surface gravity (log g)4.41±0.01 cgs
Temperature5,525±20 K
Metallicity [Fe/H]−0.11 dex
Rotational velocity (v sin i)1.44±1.0[4] km/s
Age11.8±1.2 Gyr
Other designations
BD−02°128, HD 290327, HIP 25191, SAO 132049, PPM 175811[6]
Database references
SIMBADdata
Exoplanet Archivedata

HD 290327 is a single[7] star in the equatorial constellation of Orion. It has a yellow hue with an apparent visual magnitude of 8.99,[2] which is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 182 light years from the Sun. It is drifting away with a radial velocity of +29.5 km/s,[1] having come to within 124 light-years around a million years ago.[2]

Kazanasmas (1973) found a stellar classification of G5IV[3] for this object, matching a G-type star that is evolving along the subgiant branch. It was later given a class of G8V,[4] suggesting it is instead a G-type main-sequence star. This object is nearly twelve[5] billion years old and is spinning slowly with a projected rotational velocity of 1.4 km/s.[4] The star has 86% of the mass of the Sun and 95% of the Sun's radius. It is radiating 75% of the luminosity of the Sun from its photosphere at an effective temperature of 5,525 K. The metallicity is sub-solar,[5] meaning it has a lower abundance of elements other than hydrogen and helium compared to the Sun.

In 2009, a gas giant planet was found in orbit around the star. It is orbiting at a distance of around 3.4 AU with a period of 6.7 years.[4]

The HD 290327 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 2.54+0.17
−0.14 MJ 		3.43+0.20
−0.12 		2443+205
−117 		0.08+0.08
−0.03 		— —
  1. ^ a b c d e f Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Kazanasmas1973 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Naef2010 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Bonfanti2015 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. ^ Cite error: The named reference Ginski2016 was invoked but never defined (see the help page).