S Mon
catalogues and names | S Mon, 15 Mon, HR 2456, HD 47839, SAO 114258, WDS 06410+0954A |
constellation | Monoceros |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 6h 40min 58,7sec | DEC: +9° 53' 44'' |
position (J1900) | RA: 6h 35min 28,2sec | DEC: +9° 59' 18'' |
proper motion (J2000) | RA: 0,003 arcsec/a | DEC: -0,006 arcsec/a |
radial velocity | 33 km/s note: spectroscopic binaries |
|
rotational velocity | 63 km/s (uncertain) (variable) | |
trigonometric parallax | -0,004 arcsec |
note (category: dynamical parallaxes): | 0.005". |
magnitude
visual magnitude | 4,66 (V on UBV Johnson system) |
spectral / color information
spectral class | O7V((f)) |
B-V-magnitude | -0,25 |
U-B-magnitude | -1,07 |
R-I-magnitude | -0,22 |
note (category: spectra): | Also classified O8III((f)). uv 1240 absorption strong. |
note (category: colors): | Color excess E(B-V) = +0.07. |
variability information
variable star identification | S Mon |
note (category: variability): | ADS 5322A, Ia? 4.62 - 4.67V. R-I also found at -0.11. |
double/multiple star system information
number of components of multiple star system | 13 |
separation | 2,9 arcsec |
mag difference (of double or brightest multiple) | 3,5 |
component ID | AB |
note (category: double and multiple data): | AB binary, 4.8 Oe5, 7.6 B7; C, 9.9v B8V at 17", physical, vsini 141k/s; D, 9.7v A6III at 41", physical, vsini 115k/s; E1 the brighter component of E, B5V at 74", probably optical, vsini 253k/s; E2, A0V, vsini 132k/s. |
miscellaneous information
note (category: group membership): | In cluster NGC 2264 #131; HII reg. S273; Mon OB1; T-Tauri assoc., Mon T1. The cluster appears to be the nucleus of the association. In region of neutral hydrogen. Ionized Mon OB1 region probably excited by S Mon. The electron density of the HII region increases toward the center of the cluster. (Note that OB associations MonI = IIMon = Mon OB1 and MonII = IMon = OB2. In conversions from the earlier designations to OB1 and OB2 these groups have occasionally been interchanged; however, they may be related.) |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 6h 40min 58,683sec | DEC: +9° 53' 44,57'' | ±0,19 arcsec | source: 33 |
proper motion (J2000) | RA: 0,0002 arcsec/a | DEC: -0,007 arcsec/a | source: 25 | |
radial velocity | 33 km/s | source: 25 | ||
galactic coord. (B1950) | longitude: 202,94° | latitude: 2,2° | ||
GCI unit vector (J2000) | X: -0,175203 | Y: 0,969417 | Z: 0,171855 |
magnitude:
visual | 4,6 (observed) | source: 31 |
photovisual | 4,7 | source: 2 |
spectral information:
spectral class | O0 | source: 96 | |
Morgan-Keenan | O7V((f)) | source: 25 | |
B-magnitude | 4,41 ±0,05 | B-V-magnitude | -0,25 |
U-magnitude | 3,34 ±0,05 | U-B-magnitude | -1,07 |
variability information:
variability type | 200 |
var. amplitude | 0,06 |
double/multiple star system information:
separation between brightest and second brightest component | 0 arcsec |
position angle | 36 ° |
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 | |
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 | |
30 | GCVS, 4th edition |
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
31 | CRM' (non-GCVS variable data) |
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
33 | Hipparcos Main Input Catalogue Version 2 |
Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993 | |
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 38min 13,429sec | DEC: +9° 56' 37,02'' | ±0,01 arcsec |
position (J2000) | RA: 6h 40min 58,688sec | DEC: +9° 53' 44,41'' | |
proper motion J1950 (FK4) | RA: 0,0001 arcsec/a | DEC: -0,007 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0,0002 arcsec/a | DEC: -0,006 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 the "Henry Draper Catalogue". |
spectral information:
spectral class | Oe5 |
source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
source catalogue | FK3, catalogue number: 253 |
Durchmusterung | BD+10 1220 |
Boss General Catalogue | 8720 |
Henry Draper Catalogue | 47839 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 6h 41min | DEC: +9° 54' |
proper motion (J2000) | RA: -0,021 arcsec/a | DEC: -0,003 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 | 1869 | 14 | 45° | 3,8'' | 9,3 | 10,4 | B6V | D 11 |
AC | 1873 | 5 | 222° | 40,8'' | 9,3 | 9,7 | - | D 11 |
Aa | 1988 | 2 | 13° | 0,1'' | 4,66 | - | O7Ve | CHR 168 |
1993 | 36° | 0'' | ||||||
Aa-B | 1825 | 54 | 209° | 2,8'' | 4,8 | 7,6 | - | STF 950 |
1983 | 213° | 2,9'' | ||||||
Aa-C | 1831 | 24 | 13° | 16,6'' | 4,7 | 9,9 | - | STF 950 |
Aa-D | 1841 | 4 | 308° | 41,3'' | 4,7 | 9,7 | - | STF 950 |
Aa-E | 1874 | 12 | 139° | 73,9'' | 4,7 | 10 | - | STF 950 |
Aa-F | 1874 | 4 | 222° | 155,9'' | 4,8 | 9,08 | - | STF 950 |
Aa-K | 1923 | 1 | 56° | 105,6'' | 4,7 | 8,2 | - | STF 950 |
Aa-S | 1914 | 1 | 261° | 136,6'' | 4,7 | 9,7 | - | STF 950 |
FG | 1873 | 4 | 262° | 39,8'' | 7,8 | 8,3 | - | STF 950 |
FS | 1914 | 1 | 342° | 98,5'' | 7,8 | 9,8 | - | STF 950 |
GS | 1914 | 1 | 5° | 98,3'' | 8,3 | 9,8 | - | STF 950 |
- | 1914 | 3 | 166° | 89,5'' | 4,8 | 8 | - | STF 950 |
- | 1874 | 3 | 103° | 178,3'' | 4,7 | 9,4 | - | STF 950 |
- | 1902 | 1 | 115° | 14,2'' | - | - | - | STF 950 |
discoverer information:
discoverer code | discoverer | reference |
D 11 | Dembowski, E. | - |
CHR 168 | - | - |
STF 950 | Struve, F.G.W. | - |
notes:
note | A is an irregular variable, S Mon. A measure of STF 950 A and D 11 C. A measure of STF 950 A and STF 952 A. E is BD+10@1223. F is BD+09@1338. Proper motion of F -002 -001. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (J1950) | RA: 6h 38min 13,4sec | DEC: +9° 56' 37'' |
variability informations:
variability type | IA: | eruptive variable star |
magnitute at max. brightness | 4,62 | |
magnitute at min. brightness | 4,68 | |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | O7.5III-Vf |
references
to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
ID in the GCVS catalogue | 55/2 |
constellation | Monoceros |
notes on existence | The star is equivalent to '0550003 T'. |
There are notes in published catalog. |
variability type description
variability type | description |
IA | Poorly studied irregular variables of early (O-A) spectral type. |