b Gruis

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 b Gru, bet Gru, HR 8636, HD 214952, SAO 231258, FK5: 856
constellation Grus

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: 22h 42min 40,1sec DEC: -46 53' 5''
position (J1900) RA: 22h 36min 41,8sec DEC: -47 24' 27''
proper motion (J2000) RA: 0,137 arcsec/a DEC: -0,008 arcsec/a
radial velocity 2 km/s
trigonometric parallax 0,008 arcsec


visual magnitude 2,1
(V on UBV Johnson system)

spectral / color information

spectral class M5III
B-V-magnitude 1,6
U-B-magnitude 1,67
R-I-magnitude 1,65
note (category: spectra): Also classified M3II.

variability information

variable star identification Bet Gru
note (category: variability): Lc? 2.0 - 2.3V.

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

position, motion, parallax:

position (J2000) RA: 22h 42min 40,063sec DEC: -46 53' 4,69'' 0,19 arcsec source: 16
proper motion (J2000) RA: 0,0133 arcsec/a DEC: -0,008 arcsec/a source: 25
radial velocity 2 km/s source: 25
trigonometric parallax 0,008 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 346,27 latitude: -57,95
GCI unit vector (J2000) X: 0,644929 Y: -0,226269 Z: -0,729979


visual 2,1 (observed) source: 25
photovisual 2,2 source: 2
photographic 3,6 source: 2

spectral information:

spectral class M0 source: 96
Morgan-Keenan M4.5III source: 25
B-magnitude 3,7 0,05 B-V-magnitude 1,6
U-magnitude 5,37 0,05 U-B-magnitude 1,67

variability information:

source of data: 30
variability type 172
var. amplitude 0,3


2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
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
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: 22h 39min 41,443sec DEC: -47 8' 48,2'' 0,01 arcsec
position (J2000) RA: 22h 42min 40,067sec DEC: -46 53' 4,92''
proper motion J1950 (FK4) RA: 0,0135 arcsec/a DEC: -0,006 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0135 arcsec/a DEC: -0,011 arcsec/a
source of proper motion data Determined by source catalog


visual 2,2 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class M3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 856
Durchmusterung CD-4714308
Boss General Catalogue 31685
Henry Draper Catalogue 214952

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


position (J1950) RA: 22h 39min 41,4sec DEC: -47 8' 48''

variability informations:

variability type LC: pulsating variable star
magnitute at max. brightness 2
magnitute at min. brightness 2,3
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M3-5II-III


to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)


ID in the GCVS catalogue 39/9002
constellation Grus
notes on existence The star is equivalent to '03990042del 2'.

variability type description

variability type description
LC Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).