e Trianguli
catalogues and names
| catalogues and names | e Tri, NSV 00707, 3 Tri, HR 599, HD 12471, SAO 55218, BD +32 369, WDS 02030+3317 |
| constellation | Triangulum |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 2min 58sec | DEC: +33° 17' 2'' | ||
| position (B1900) | RA: 1h 57min 7.2sec | DEC: +32° 48' 8'' | ||
| proper motion (J2000) | RA: -0.016 arcsec/a | DEC: -0.013 arcsec/a | ||
| radial velocity | 3 km/s note: spectroscopic binaries |
|||
| rotational velocity | 92 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 139.71° | latitude: -27.25° | ||
magnitude
| visual magnitude | 5.5 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2V |
| B-V-magnitude | 0.03 |
| U-B-magnitude | 0.06 |
| R-I-magnitude |
variability information
| variable star identification | 707 |
| note (category: variability): | ADS 1621. Uncertain which component varies. B-A from 4.5 - 6.0v. |
double/multiple star system information
| separation | 4.2 arcsec |
| mag difference (of double or brightest multiple) | 6 |
miscellaneous information
| note (category: group membership): | UMa stream. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 2min 57.877sec | DEC: +33° 17' 3.58'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0025 arcsec/a | DEC: 0.002 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| trigonometric parallax | 0.01 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 139.72° | latitude: -27.25° | ||
magnitude:
| visual | 5.5 (observed) | source: 25 |
| photovisual | 5.4 | source: 2 |
| photographic | 5.5 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A2V | source: 25 | |
| B-magnitude | 5.53 ±0.05 | B-V-magnitude | 0.03 |
| U-magnitude | 5.59 ±0.05 | U-B-magnitude | 0.06 |
double/multiple star system information:
| separation between brightest and second brightest component | 4 arcsec |
| magnitude difference between brightest and second brightest component | 6 |
| position angle | 120 ° |
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 | |
| 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 | |
| 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 0min 2.186sec | DEC: +33° 2' 38.48'' | ±0.02 arcsec |
| position (J2000) | RA: 2h 2min 57.954sec | DEC: +33° 17' 2.36'' | |
| proper motion B1950 (FK4) | RA: -0.0013 arcsec/a | DEC: -0.009 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0013 arcsec/a | DEC: -0.013 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2 |
| 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: 2458 |
| Durchmusterung | BD+32 369 |
| Boss General Catalogue | 2458 |
| Henry Draper Catalogue | 12471 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 3min | DEC: +33° 17' |
| proper motion (J2000) | RA: -0.016 arcsec/a | DEC: -0.007 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 |
| - | 1833 | 16 | 120° | 4'' | 5.4 | 11.4 | A2V | STF 201 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 201 | Struve, F.G.W. | - |
notes:
| note | Epsilon Tri. Proper motion of B -011 -018. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 2h 0min 2.2sec | DEC: +33° 2' 38'' |
variability informations:
| variability type | - |
| magnitute at max. brightness | 5.5 |
| magnitute at min. brightness | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | A2 |
references
| to a study | 620955D (designation: EPSIL.TRI) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |