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	m Hya, NSV 18402, 42 Hya, HR 4094, HD 90432, SAO 155980, BD -16 3052, FK5: 389
constellation	Hydra

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 10h 26min 5.4sec	DEC: -16° 50' 11''
position (B1900)	RA: 10h 21min 15.2sec	DEC: -16° 19' 33''
proper motion (J2000)	RA: -0.128 arcsec/a	DEC: -0.08 arcsec/a
radial velocity	40 km/s note: variable radial velocity
rotational velocity	<19 km/s
trigonometric parallax	0.018 arcsec
galactic coordinates	longitude: 259.99°	latitude: 33.65°

magnitude

visual magnitude

3.81 (V on UBV Johnson system)

spectral / color information

spectral class	K4.5III
B-V-magnitude	1.48
U-B-magnitude	1.82
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 26min 5.43sec	DEC: -16° 50' 10.85''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0089 arcsec/a	DEC: -0.08 arcsec/a		source: 25
radial velocity	40 km/s			source: 25
trigonometric parallax	0.018 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 260°	latitude: 33.65°

magnitude:

visual	3.81 (observed)	source: 25
photovisual	4.1	source: 2
photographic	5.2	source: 2

spectral information:

spectral class	K5		source: 96
Morgan-Keenan	K4+III		source: 25
B-magnitude	5.29 ±0.05	B-V-magnitude	1.48
U-magnitude	7.11 ±0.05	U-B-magnitude	1.82

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 23min 40.213sec	DEC: -16° 34' 49.56''	±0.005 arcsec
position (J2000)	RA: 10h 26min 5.431sec	DEC: -16° 50' 10.65''
proper motion B1950 (FK4)	RA: -0.0092 arcsec/a	DEC: -0.083 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0089 arcsec/a	DEC: -0.078 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	K5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 389
Durchmusterung	BD-16 3052
Boss General Catalogue	14326
Henry Draper Catalogue	90432