p Eridani
catalogues and names
catalogues and names | p Eri, HR 487, HD 10361, SAO 232490, WDS 01398-5612B |
constellation | Eridanus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 1h 39min 47.8sec | DEC: -56° 11' 41'' | ||
position (B1900) | RA: 1h 36min 0.5sec | DEC: -56° 42' 8'' | ||
proper motion (J2000) | RA: 0.279 arcsec/a | DEC: 0.02 arcsec/a | ||
radial velocity | 20 km/s | |||
trigonometric parallax | 0.152 arcsec | |||
galactic coordinates | longitude: 289.6° | latitude: -59.66° |
note (category: dynamical parallaxes): | 0.108". |
magnitude
visual magnitude | 5.76 (V on UBV Johnson system) |
spectral / color information
spectral class | K5V |
B-V-magnitude | 0.87 |
U-B-magnitude | 0.53 |
R-I-magnitude |
double/multiple star system information
separation | 10.8 arcsec |
mag difference (of double or brightest multiple) | 0.1 |
note | Worley (1978) update of the IDS |
note (category: double and multiple data): | AB 5.79 K0V, 5.83 K0V, 483.66y, a = 7.817". B is HR 486. Combined light HR 486-487, 5.07V. Spectra also classified K1V, K1.5V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 1h 39min 47.56sec | DEC: -56° 11' 46.7'' | ±0.76 arcsec | source: 18 |
proper motion (J2000) | RA: 0.0359 arcsec/a | DEC: 0.01 arcsec/a | source: 25 | |
radial velocity | 20 km/s | source: 25 | ||
trigonometric parallax | 0.152 arcsec | ±0.015 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 289.59° | latitude: -59.66° |
magnitude:
visual | 5.76 (observed) | source: 25 |
photovisual | 6 | source: 2 |
spectral information:
Morgan-Keenan | K5V | source: 25 | |
B-magnitude | 6.63 ±0.05 | B-V-magnitude | 0.87 |
U-magnitude | 7.16 ±0.05 | U-B-magnitude | 0.53 |
double/multiple star system information:
separation between brightest and second brightest component | 11.2 arcsec |
magnitude difference between brightest and second brightest component | 0 |
position angle | 193 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 5.76 | - | p Eridani, HR 487, HD 10361, SAO 232490 |
B | 5.87 | G5 | p Eridani, HR 486, HD 10360, SAO 232492 |
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 | |
18 | Hipparcos Input Catalog Version 2 Annex |
Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 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 |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
position (B1950) | RA: 1h 37min 54.263sec | DEC: -56° 26' 52.43'' | ±0.024 arcsec |
position (J2000) | RA: 1h 39min 47.766sec | DEC: -56° 11' 40.65'' | |
proper motion B1950 (FK4) | RA: 0.0337 arcsec/a | DEC: 0.027 arcsec/a | ±0.005 arcsec/a in RA ±0.004 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0334 arcsec/a | DEC: 0.02 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 5.3 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | G5 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | GC, catalogue number: 2030 |
Durchmusterung | CP-56 329 |
Boss General Catalogue | 2030 |
Henry Draper Catalogue | 10360 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 1h 39.8min | DEC: -56° 12' |
proper motion (J2000) | RA: 0.323 arcsec/a | DEC: 0.095 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 |
- | 1835 | often | 302° | 3.6'' | 5.86 | 5.82 | K0V K5V | DUN 5 |
1990 | 193° | 11.2'' |
discoverer information:
discoverer code | discoverer | reference |
DUN 5 | Dunlop, J. | - |
notes:
note | P = 484yr., a = 7.8", motion retrograde. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
position (B1900) | RA: 1h 36min | DEC: -56° 42' |
magnitudes, spectral classes, orbital elements:
author: | G.B. van Albada |
date of observation: | 1956 |
magnitude of component A: | 5.79 |
magnitude of component B: | 5.79 |
spectral class component B: | K0V |
spectral class component B: | K0V |
period [y]: | 483.66 |
semi-major axis [arcsec]: | 7.817 |
inclination [deg]: | 142.82 |
node [deg]: | 13.12 (ascending) |
equinox of node: | 2000 |
eccentricity: | 0.534 |
time of periastron passage: | 1813.494 |
dates of ephemeris: | 1950-1980 |
grade: | preliminary |
reference: | Cont. Bosscha Obs. No. 5. |
other name(s) | DUN 5, p Eri |