Ross 248

Ross 248
	Ross 248 Location of Ross 248 in the constellation Andromeda;
Observation data; Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	23h 41m 55.03630s
Declination	+44° 10′ 38.8189″
Apparent magnitude (V)	12.23 - 12.34
Characteristics
Spectral type	M6 V
U−B color index	+1.48[citation needed]
B−V color index	+1.92[citation needed]
Variable type	BY Dra
Astrometry
Radial velocity (Rv)	−77.29±0.19 km/s
Proper motion (μ)	RA: 112.527±0.036 mas/yr ; Dec.: −1591.650±0.027 mas/yr
Parallax (π)	316.4812 ± 0.0444 mas
Distance	10.306 ± 0.001 ly ; (3.1597 ± 0.0004 pc)
Absolute magnitude (MV)	14.79
Details
Mass	0.145 M☉
Radius	0.190 R☉
Luminosity	0.0022 L☉
Surface gravity (log g)	5.13 cgs
Temperature	2,930 K
Metallicity [Fe/H]	+0.23 dex
Rotation	114.3±2.8 d
Rotational velocity (v sin i)	0.1 km/s
Age	2.6 Gyr
Other designations
	HH Andromedae, HH And, 2MASS J23415498+4410407, G 171-010, GCTP 5736.00, GJ 905, LHS 549.
Database references
SIMBAD	data

Ross 248, also called HH Andromedae or Gliese 905, is a small star approximately 10.30 light-years (3.16 parsecs)^[10] from Earth in the northern constellation of Andromeda. Despite its proximity it is too dim to be seen with the naked eye.^[11] It was first catalogued by Frank Elmore Ross in 1926 with his second list of proper-motion stars;^[12] on which count it ranks 261st in the SIMBAD database. It was too dim to be included in the Hipparcos survey. In about 40,000 years, Voyager 2 will pass 1.7 light-years (9.7 trillion miles) from the star.

Within the next 80,000 years, Ross 248 is predicted to be the nearest star to the Sun for around 9,000 years, overtaking the current nearest star, the triple system Alpha Centauri.

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[GaiaDR3-1] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[gcvs-2] Cite error: The named reference gcvs was invoked but never defined (see the help page).

[apj704_2_975-3] Cite error: The named reference apj704_2_975 was invoked but never defined (see the help page).

[apj119-4] Cite error: The named reference apj119 was invoked but never defined (see the help page).

[mann2015-5] Cite error: The named reference mann2015 was invoked but never defined (see the help page).

[carmenes-6] Cite error: The named reference carmenes was invoked but never defined (see the help page).

[Donati2023-7] Cite error: The named reference Donati2023 was invoked but never defined (see the help page).

[newton2015-8] Cite error: The named reference newton2015 was invoked but never defined (see the help page).

[SIMBAD-9] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[apjss82-10] Cite error: The named reference apjss82 was invoked but never defined (see the help page).

[routray2004-11] Cite error: The named reference routray2004 was invoked but never defined (see the help page).

[aj36_856_124-12] Cite error: The named reference aj36_856_124 was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox J2000
Ross 248 Location of Ross 248 in the constellation Andromeda
Constellation	Andromeda
Right ascension	23^h 41^m 55.03630^s^[1]
Declination	+44° 10′ 38.8189″^[1]
Apparent magnitude (V)	12.23 - 12.34^[2]
Characteristics
Spectral type	M6 V^[3]
U−B color index	+1.48^{[citation needed]}
B−V color index	+1.92^{[citation needed]}
Variable type	BY Dra^[2]
Astrometry

Radial velocity (R_v)	−77.29±0.19^[1] km/s
Proper motion (μ)	RA: 112.527±0.036 mas/yr^[1] Dec.: −1591.650±0.027 mas/yr^[1]
Parallax (π)	316.4812 ± 0.0444 mas^[1]
Distance	10.306 ± 0.001 ly (3.1597 ± 0.0004 pc)
Absolute magnitude (M_V)	14.79^[4]

Details

Mass	0.145^[5] `M`_☉
Radius	0.190^[5] `R`_☉
Luminosity	0.0022^[6] `L`_☉
Surface gravity (log g)	5.13^[6] cgs
Temperature	2,930^[5] K
Metallicity [Fe/H]	+0.23^[5] dex
Rotation	114.3±2.8 d^[7]
Rotational velocity (v sin i)	0.1^[8] km/s
Age	2.6^[5] Gyr

Other designations
HH Andromedae, HH And, 2MASS J23415498+4410407, G 171-010, GCTP 5736.00, GJ 905, LHS 549.^[9]
Database references
SIMBAD	data