Ross 154 information

Ross 154
	Ross 154 Location of Ross 154 in the constellation Sagittarius;
Observation data; Epoch J2000 Equinox J2000
Constellation	Sagittarius
Right ascension	18h 49m 49.36378s
Declination	–23° 50′ 10.4474″
Apparent magnitude (V)	10.44
Characteristics
Spectral type	M3.5V
B−V color index	1.76
Variable type	Flare star
Astrometry
Radial velocity (Rv)	−11.12±0.57 km/s
Proper motion (μ)	RA: +639.368 mas/yr ; Dec.: –193.958 mas/yr
Parallax (π)	336.0266 ± 0.0317 mas
Distance	9.7063 ± 0.0009 ly ; (2.9760 ± 0.0003 pc)
Absolute magnitude (MV)	13.07
Details
Mass	0.177 ± 0.004 M☉
Radius	0.200 ± 0.008 R☉
Luminosity	0.004015±0.000048 L☉
Surface gravity (log g)	5.00 ± 0.05 cgs
Temperature	3,248+68; −66 K
Metallicity [Fe/H]	-0.25 dex
Rotation	2.848 ± 0.001 days
Rotational velocity (v sin i)	3.5 ± 1.5 km/s
Age	under 1 Gyr
Other designations
	CD−23° 14742, GCTP 4338, GJ 729, HIP 92403, LHS 3414, V1216 Sagittarii.
Database references
SIMBAD	data

Ross 154 (V1216 Sgr) is a star in the southern zodiac constellation of Sagittarius. It has an apparent visual magnitude of 10.44,^[2] making it much too faint to be seen with the naked eye. At a minimum, viewing Ross 154 requires a telescope with an aperture of 6.5 cm (3 in) under ideal conditions.^[10] The distance to this star can be estimated from parallax measurements, which places it at 9.71 light-years (2.98 parsecs) away from Earth.^[1] It is the nearest star in the southern constellation Sagittarius, and one of the nearest stars to the Sun.

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[mills1994-10] Cite error: The named reference mills1994 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Ross 154 Location of Ross 154 in the constellation Sagittarius
Constellation	Sagittarius
Right ascension	18^h 49^m 49.36378^s^[1]
Declination	–23° 50′ 10.4474″^[1]
Apparent magnitude (V)	10.44^[2]
Characteristics
Spectral type	M3.5V^[2]
B−V color index	1.76^[3]
Variable type	Flare star^[4]
Astrometry

Radial velocity (R_v)	−11.12±0.57^[1] km/s
Proper motion (μ)	RA: +639.368 mas/yr^[1] Dec.: –193.958 mas/yr^[1]
Parallax (π)	336.0266 ± 0.0317 mas^[1]
Distance	9.7063 ± 0.0009 ly (2.9760 ± 0.0003 pc)
Absolute magnitude (M_V)	13.07^[2]

Details

Mass	0.177 ± 0.004^[5] `M`_☉
Radius	0.200 ± 0.008^[5] `R`_☉
Luminosity	0.004015±0.000048^[5] `L`_☉
Surface gravity (log g)	5.00 ± 0.05^[6] cgs
Temperature	3,248+68 −66^[5] K
Metallicity [Fe/H]	-0.25^[7] dex
Rotation	2.848 ± 0.001^[8] days
Rotational velocity (v sin i)	3.5 ± 1.5^[7] km/s
Age	under 1^[7] Gyr

Other designations
CD−23° 14742, GCTP 4338, GJ 729, HIP 92403, LHS 3414, V1216 Sagittarii.^[9]
Database references
SIMBAD	data

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