n Hydrae
| catalogues and names |
| The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
catalogues and names
| catalogues and names | n Hya, HR 4232, HD 93813, SAO 156256, BD -15 3138, FK5: 410 |
| constellation | Hydra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 10h 49min 37.5sec | DEC: -16° 11' 37'' | ||
| position (B1900) | RA: 10h 44min 41.4sec | DEC: -15° 40' 13'' | ||
| proper motion (J2000) | RA: 0.094 arcsec/a | DEC: 0.2 arcsec/a | ||
| radial velocity | -1 km/s | |||
| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.028 arcsec | |||
| galactic coordinates | longitude: 265.05° | latitude: 37.56° | ||
magnitude
| visual magnitude | 3.11 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2III |
| B-V-magnitude | 1.25 |
| U-B-magnitude | 1.3 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 10h 49min 37.494sec | DEC: -16° 11' 37.26'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0065 arcsec/a | DEC: 0.2 arcsec/a | source: 25 | |
| radial velocity | -1 km/s | source: 25 | ||
| trigonometric parallax | 0.028 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 265.06° | latitude: 37.56° | ||
magnitude:
| visual | 3.11 (observed) | source: 25 |
| photovisual | 3.3 | source: 2 |
| photographic | 4.3 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K1.5IIIbHdel-0.5 | source: 25 | |
| B-magnitude | 4.36 ±0.05 | B-V-magnitude | 1.25 |
| U-magnitude | 5.66 ±0.05 | U-B-magnitude | 1.3 |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
| 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: 10h 47min 9.331sec | DEC: -15° 55' 53.45'' | ±0.005 arcsec |
| position (J2000) | RA: 10h 49min 37.497sec | DEC: -16° 11' 37.16'' | |
| proper motion B1950 (FK4) | RA: 0.0062 arcsec/a | DEC: 0.196 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0066 arcsec/a | DEC: 0.201 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 410 |
| Durchmusterung | BD-15 3138 |
| Boss General Catalogue | 14898 |
| Henry Draper Catalogue | 93813 |