b Monocerotis


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. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)


catalogues and names b Mon, NSV 02977, 11 Mon, HR 2356, HD 45725, SAO 133316, WDS 06288-0702A
constellation Monoceros

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


position, motion, parallax:

position (J2000) RA: 6h 28min 49sec DEC: -7 1' 58''
position (J1900) RA: 6h 23min 58sec DEC: -6 58' 8''
proper motion (J2000) RA: -0,017 arcsec/a DEC: 0 arcsec/a
radial velocity 20 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 346 km/s (uncertain) (variable)
trigonometric parallax 0,021 arcsec

magnitude

visual magnitude 4,6
(V on UBV Johnson system)

spectral / color information

spectral class B3Ve
B-V-magnitude -0,1
U-B-magnitude -0,63
R-I-magnitude -0,16
note (category: spectra): Shell star with variable H alpha emission.

variability information

variable star identification 2977
note (category: variability): Hydrogen lines var. K 30k/s. Shell line velocities do not correspond to orbital elements; may be due to gaseous ring.

double/multiple star system information

number of components of multiple star system 4
separation 7,1 arcsec
mag difference (of double or brightest multiple) 0,5
component ID AB
note (category: double and multiple data): Triple system with HR 2357 and 2358. Combined mag., color 3.74V, -0.15(B-V), all Be stars. AB, 17000y; AC, sep. 10", 29000y. Component D, 12.2v at 26" from A. Uncertain which of components A,B,C, HR 2356,7,8 is the light variable NSV 2977, for which the mag. 3.75V is a blend of all three.
note (category: spectroscopic binaries): 12.5y, K 30k/s, asini 1900. Shell oscillations. Spectrum var. 12.5y for 3.5 cycles, then ceased.

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

position, motion, parallax:

position (J2000) RA: 6h 28min 48,96sec DEC: -7 1' 58,2'' 0,76 arcsec source: 18
proper motion (J2000) RA: -0,0015 arcsec/a DEC: 0,002 arcsec/a source: 25
radial velocity 20 km/s source: 25
trigonometric parallax 0,021 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 216,67 latitude: -8,21
GCI unit vector (J2000) X: -0,124459 Y: 0,984641 Z: -0,122438

magnitude:

visual 4,6 (observed) source: 25
photovisual 4,7 source: 2
photographic 4,5 source: 2

spectral information:

spectral class B2 source: 96
Morgan-Keenan B3Ve source: 25
B-magnitude 4,5 0,05 B-V-magnitude -0,1
U-magnitude 3,87 0,05 U-B-magnitude -0,63

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 7,2 arcsec
magnitude difference between brightest and second brightest component 0,8
position angle 132

sources:

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
18 Hipparcos Input Catalog Version 2 Annex
Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 1993
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
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: 6h 26min 23,454sec DEC: -6 59' 58,06'' 0,02 arcsec
position (J2000) RA: 6h 28min 48,978sec DEC: -7 1' 58,44''
proper motion J1950 (FK4) RA: -0,0015 arcsec/a DEC: -0,002 arcsec/a 0,004 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0011 arcsec/a DEC: 0 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class B2e
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 8412
Durchmusterung BD-06 1574
Boss General Catalogue 8412
Henry Draper Catalogue 45725

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 6h 28,8min DEC: -7 2'
proper motion (J2000) RA: -0,037 arcsec/a DEC: 0 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1831 87 132 7,2'' 4,7 5,2 B3Ve B3ne STF 919
AC 1831 25 125 9,9'' 5,1 6,1 B3Ve B3e STF 919
AD 1878 5 56 25,9'' 4,7 12,2 B3Ve BU 570
BC 1831 78 102 2,5'' 5,7 6,2 B3Ve B3e STF 919
1992 107 2,9''
Cc 1988 1 141 0,3'' 5,6 - - CHR 167

discoverer information:

discoverer code discoverer reference
STF 919 Struve, F.G.W. -
BU 570 Burnham, S.W. -
CHR 167 - -

notes:

note Beta Mon. A,B, and C are shell stars.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 6h 26min 23,7sec DEC: -7 0' 0''

variability informations:

magnitute at max. brightness 3,75
magnitute at min. brightness
photometric system visual, photovisual or Johnson's V

spectral information

spectral class BE

references

to a study 671390D (designation: HR 2356/8)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).