15 Trianguli
catalogues and names
| catalogues and names | NSV 00866, 15 Tri, HR 750, HD 16058, SAO 55687, BD +34 469, WDS 02358+3441 |
| constellation | Triangulum |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 35min 46.8sec | DEC: +34° 41' 15'' | ||
| position (B1900) | RA: 2h 29min 42.5sec | DEC: +34° 15' 5'' | ||
| proper motion (J2000) | RA: 0.03 arcsec/a | DEC: -0.049 arcsec/a | ||
| radial velocity | -10 km/s note: variable radial velocity |
|||
| trigonometric parallax | 0.016 arcsec | |||
| galactic coordinates | longitude: 146.14° | latitude: -23.44° | ||
magnitude
| visual magnitude | 5.35 (V on UBV Johnson system) |
spectral / color information
| spectral class | M3IIIa |
| B-V-magnitude | 1.66 |
| U-B-magnitude | 1.93 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 866 |
| note (category: variability): | Lb?, 5.39 - 5.53V. |
double/multiple star system information
| separation | 141.3 arcsec |
| mag difference (of double or brightest multiple) | 1.2 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | Companion, A5, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 35min 46.844sec | DEC: +34° 41' 15.23'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0027 arcsec/a | DEC: -0.052 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0.016 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 146.15° | latitude: -23.44° | ||
magnitude:
| visual | 5.35 (observed) | source: 25 |
| photovisual | 5.6 | source: 2 |
| photographic | 7 | source: 2 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M3IIIa | source: 25 | |
| B-magnitude | 7.01 ±0.05 | B-V-magnitude | 1.66 |
| U-magnitude | 8.94 ±0.05 | U-B-magnitude | 1.93 |
double/multiple star system information:
| separation between brightest and second brightest component | 141.3 arcsec |
| magnitude difference between brightest and second brightest component | 1.5 |
| position angle | 17 ° |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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 (B1950) | RA: 2h 32min 44.239sec | DEC: +34° 28' 14.37'' | ±0.019 arcsec |
| position (J2000) | RA: 2h 35min 46.823sec | DEC: +34° 41' 15.42'' | |
| proper motion B1950 (FK4) | RA: 0.0024 arcsec/a | DEC: -0.046 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0024 arcsec/a | DEC: -0.049 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | Mb |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 3103 |
| Durchmusterung | BD+34 469 |
| Boss General Catalogue | 3103 |
| Henry Draper Catalogue | 16058 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 35.8min | DEC: +34° 41' |
| proper motion (J2000) | RA: 0.034 arcsec/a | DEC: -0.052 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 |
| - | 1906 | 3 | 17° | 138.9'' | 5.35 | 6.8 | M3IIIa | AG 304 |
| 1959 | - | 141.3'' |
discoverer information:
| discoverer code | discoverer | reference |
| AG 304 | - | - |
notes:
| note | 15 Tri. B is BD+34@471. Proper motion of B +002 -010. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 2h 32min 44.2sec | DEC: +34° 28' 14'' |
variability informations:
| variability type | LB: | pulsating variable star |
| magnitute at max. brightness | 5.39 | |
| magnitute amplitude | 0.14 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M3 |
references
| to a study | 300015D (designation: HR 750) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |
variability type description
| variability type | description |
| LB |
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. LB 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. LC Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas). |