R Serpentis

R Serpentis
	; The visual band light curve of R Serpentis, from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	15h 50m 41.73245s
Declination	+15° 08′ 01.0810″
Apparent magnitude (V)	5.2 - 14.4
Characteristics
Evolutionary stage	AGB
Spectral type	M5-8e
B−V color index	1.500±0.510
Variable type	Mira
Astrometry
Radial velocity (Rv)	23.8±0.8 km/s
Proper motion (μ)	RA: +2.387 mas/yr ; Dec.: −36.699 mas/yr
Parallax (π)	3.5110±0.2966 mas
Distance	930 ± 80 ly ; (280 ± 20 pc)
Details
Mass	3.6 M☉
Radius	79 R☉
Luminosity	758 L☉
Surface gravity (log g)	1.55 cgs
Temperature	3,413 K
Other designations
	R Ser, BD+15°2918, HD 141850, HIP 77615, HR 5894, SAO 101771
Database references
SIMBAD	data

R Serpentis is a Mira variable type star in the equatorial constellation of Serpens. It ranges between apparent magnitude 5.16 and 14.4, and spectral types M5e to M8e, over a period of 356.41 days.^[4]^[11] The variability of this star was discovered in 1826 by Karl Ludwig Harding.^[12]

Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...

Observation data Epoch J2000 Equinox J2000
The visual band light curve of R Serpentis, from AAVSO data^[1]
Constellation	Serpens^[2]
Right ascension	15^h 50^m 41.73245^s^[3]
Declination	+15° 08′ 01.0810″^[3]
Apparent magnitude (V)	5.2 - 14.4^[4]
Characteristics
Evolutionary stage	AGB^[5]
Spectral type	M5-8e^[6]
B−V color index	1.500±0.510^[2]
Variable type	Mira^[4]
Astrometry

Radial velocity (R_v)	23.8±0.8^[7] km/s
Proper motion (μ)	RA: +2.387^[3] mas/yr Dec.: −36.699^[3] mas/yr
Parallax (π)	3.5110±0.2966 mas^[3]
Distance	930 ± 80 ly (280 ± 20 pc)

Details

Mass	3.6^[8] `M`_☉
Radius	79^[9] `R`_☉
Luminosity	758^[9] `L`_☉
Surface gravity (log g)	1.55^[8] cgs
Temperature	3,413^[9] K

Other designations
R Ser, BD+15°2918, HD 141850, HIP 77615, HR 5894, SAO 101771^[10]
Database references
SIMBAD	data

References