2 Herculis
catalogues and names
| catalogues and names | NSV 07335, 2 Her, HR 5932, HD 142780, SAO 45788, BD +43 2542 |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 54min 37.9sec | DEC: +43° 8' 19'' | ||
| position (B1900) | RA: 15h 51min 17.8sec | DEC: +43° 25' 47'' | ||
| proper motion (J2000) | RA: -0.032 arcsec/a | DEC: 0.065 arcsec/a | ||
| radial velocity | -10 km/s | |||
| trigonometric parallax | 0.034 arcsec | |||
| galactic coordinates | longitude: 68.68° | latitude: 49.87° | ||
magnitude
| visual magnitude | 5.37 (V on UBV Johnson system) |
spectral / color information
| spectral class | M3IIIBa0.3 |
| B-V-magnitude | 1.65 |
| U-B-magnitude | 1.97 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 7335 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 54min 37.875sec | DEC: +43° 8' 19.25'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0027 arcsec/a | DEC: 0.072 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0.034 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 68.67° | latitude: 49.87° | ||
magnitude:
| visual | 5.37 (observed) | source: 25 |
| photovisual | 5.5 | source: 2 |
| photographic | 7.3 | source: 16 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M3-III | source: 25 | |
| B-magnitude | 7.02 ±0.05 | B-V-magnitude | 1.65 |
| U-magnitude | 8.99 ±0.05 | U-B-magnitude | 1.97 |
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 | |
| 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: 15h 52min 57.713sec | DEC: +43° 16' 59.72'' | ±0.023 arcsec |
| position (J2000) | RA: 15h 54min 37.861sec | DEC: +43° 8' 18.69'' | |
| proper motion B1950 (FK4) | RA: -0.0034 arcsec/a | DEC: 0.062 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.003 arcsec/a | DEC: 0.065 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | M0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 21382 |
| Durchmusterung | BD+43 2542 |
| Boss General Catalogue | 21382 |
| Henry Draper Catalogue | 142780 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 15h 52min 57.7sec | DEC: +43° 17' 0'' |
variability informations:
| magnitute at max. brightness | 5.33 |
| magnitute amplitude | 0.12 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M3 |
references
| to a study | 640818D (designation: 348) |