R Leonis

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 9h 47min 33.5sec	DEC: +11° 25' 44''
position (2000.72)	RA: 9h 47min 36sec	DEC: +11° 25' 32''
position (B1900)	RA: 9h 42min 10.8sec	DEC: +11° 53' 34''
proper motion (J2000)	RA: 0.002 arcsec/a	DEC: -0.042 arcsec/a
radial velocity	13 km/s note: suspected variable radial velocity
trigonometric parallax	0.02 arcsec
galactic coordinates	longitude: 223.72°	latitude: 44.16°

magnitude

visual magnitude

6.02
(V on UBV Johnson system)

spectral / color information

spectral class	M8IIIe
B-V-magnitude	1.3
U-B-magnitude	-0.2
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

SiO maser. H2O bands. Silicate emission. Also classified M6e-M9.5IIIe.

note (category: colors):

R-I corresponds to 7.52V, +1.41(B-V), +0.28(U-B).

variability information

variable star identification

R Leo

note (category: variability):

M 4.4 - 11.3v, 309.95d. Period varies from 307.4 to 317.8d. Discovered by Koch in 1782.

miscellaneous information

note (category: group membership):

Wolf 630 group.

note (category: polarization):

Polarization possibly due to circumstellar dust scattering.

note (category: stellar radii or diameters):

Speckle interferometer observations show abrupt variations in diameter as a function of wavelength, interpreted as due to large opacity of TiO. 0.032" at 5400A to 0.054" at 7300A to 0.030" at 7400A. Occultation diam. = 0.067", the largest measured angular diameter of any star other than the Sun.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 9h 47min 33.476sec	DEC: +11° 25' 43.66''	ą0.2 arcsec	source: 52
position (2000.72)	RA: 9h 47min 35sec	DEC: +11° 25' 32''	JD: 2451806.35
proper motion (J2000)	RA: -0.0004 arcsec/a	DEC: -0.044 arcsec/a		source: 25
radial velocity	13 km/s			source: 25
trigonometric parallax	0.008 arcsec		ą0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 223.73°	latitude: 44.16°

magnitude:

visual	6.02 (observed)	source: 25
photographic	10.8	source: 16

spectral information:

spectral class	M0		source: 96
Morgan-Keenan	M8IIIe		source: 25
B-magnitude	7.32 ą0.05	B-V-magnitude	1.3
U-magnitude	7.12 ą0.05	U-B-magnitude	-0.2

variability information:

source of data: 30

variability type	180
var. amplitude	6.9
var. period	309.95
var. epoch	2444164 17. October 1979, 12:00:00 UT
next max light	2451912.75 3. January 2001, 06:00:00 UT

sources:

16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
52	PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 9h 44min 52.23sec	DEC: +11° 39' 41.87''	ą0.018 arcsec
position (2000.72)	RA: 9h 47min 36sec	DEC: +11° 25' 34''	JD: 2451806.35
position (J2000)	RA: 9h 47min 33.504sec	DEC: +11° 25' 43.54''
proper motion B1950 (FK4)	RA: 0.0001 arcsec/a	DEC: -0.046 arcsec/a	ą0.003 arcsec/a in RA ą0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: -0.042 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5 (accuracy: 1 decimal)
source of visual magnitude data	Source cited in source catalog introduction.

spectral information:

spectral class	M7e
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	GC, catalogue number: 13489
Durchmusterung	BD+12 2096
Boss General Catalogue	13489
Henry Draper Catalogue	84748

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 9h 44min 52.2sec

DEC: +11° 39' 42''

variability informations:

variability type	M	pulsating variable star
magnitute at max. brightness	4.4
magnitute at min. brightness	11.3
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2444164 17. October 1979, 12:00:00 UT
period [d]	309.95
next maximum light [JD]	2451912.75 3. January 2001, 06:00:00 UT
rising time	43 % of period

spectral information

spectral class

M6e-M8IIIe-M9.5e

references

to a study	the main characteristics of the star was determined by the authors themselves
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	46/1
constellation	Leo
notes on existence	The star is equivalent to '0460002 S'.
There are notes in published catalog.

variability type description

variability type

description

Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they
usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR).