R Leo

The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names R Leo, HR 3882, HD 84748, SAO 98769

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

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 9h 47min 33,5sec DEC: +11 25' 44''
position (J1900) 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


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 3,24
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'' 0,2 arcsec source: 52
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 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 223,73 latitude: 44,16
GCI unit vector (J2000) X: -0,82101 Y: 0,535424 Z: 0,19815


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 0,05 B-V-magnitude 1,3
U-magnitude 7,12 0,05 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


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 (J1950) RA: 9h 44min 52,23sec DEC: +11 39' 41,87'' 0,018 arcsec
position (J2000) RA: 9h 47min 33,504sec DEC: +11 25' 43,54''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: -0,046 arcsec/a 0,003 arcsec/a in RA
0,003 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


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


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 (J1950) 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


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)


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
M 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).