30 Eridani
catalogues and names
| catalogues and names | 30 Eri, HR 1202, HD 24388, SAO 130789, BD -5 769, WDS 03527-0522 |
| constellation | Eridanus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 3h 52min 41.6sec | DEC: -5° 21' 41'' | ||
| position (B1900) | RA: 3h 47min 45.2sec | DEC: -5° 39' 35'' | ||
| proper motion (J2000) | RA: -0.011 arcsec/a | DEC: -0.011 arcsec/a | ||
| radial velocity | 15 km/s note: variable radial velocity |
|||
| rotational velocity | 191 km/s (uncertain) (variable) | |||
| dynamical parallax | 0.018 arcsec | |||
| galactic coordinates | longitude: 194.49° | latitude: -41.74° | ||
magnitude
| visual magnitude | 5.48 (V on UBV Johnson system) |
spectral / color information
| spectral class | B8V |
| B-V-magnitude | -0.1 |
| U-B-magnitude | -0.41 |
double/multiple star system information
| separation | 8.3 arcsec |
| mag difference (of double or brightest multiple) | 6.7 |
| note (category: double and multiple data): | Companion F4V, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 52min 41.667sec | DEC: -5° 21' 41.04'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0002 arcsec/a | DEC: -0.006 arcsec/a | source: 25 | |
| radial velocity | 15 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 194.49° | latitude: -41.74° | ||
magnitude:
| visual | 5.48 (observed) | source: 25 |
| photovisual | 5.6 | source: 16 |
| photographic | 5.4 | source: 2 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B8V | source: 25 | |
| B-magnitude | 5.38 ±0.05 | B-V-magnitude | -0.1 |
| U-magnitude | 4.97 ±0.05 | U-B-magnitude | -0.41 |
double/multiple star system information:
| separation between brightest and second brightest component | 8.2 arcsec |
| magnitude difference between brightest and second brightest component | 4.85 |
| position angle | 135 ° |
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: 3h 50min 13.259sec | DEC: -5° 30' 33.52'' | ±0.02 arcsec |
| position (J2000) | RA: 3h 52min 41.587sec | DEC: -5° 21' 40.88'' | |
| proper motion B1950 (FK4) | RA: -0.0011 arcsec/a | DEC: -0.009 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0007 arcsec/a | DEC: -0.011 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 | B8 |
| 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: 4675 |
| Durchmusterung | BD-05 769 |
| Boss General Catalogue | 4675 |
| Henry Draper Catalogue | 24388 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 3h 52.7min | DEC: -5° 22' |
| proper motion (J2000) | RA: -0.003 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 |
| - | 1863 | 9 | 135° | 8.2'' | 5.5 | 10.35 | B8V | HJ 338 |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 338 | Herschel, J. | - |
notes:
| note | 30 Eri. |