NSV 20178


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0


catalogues and names NSV 20178, 54 Hya, HR 5497, HD 129926, SAO 182855, WDS 14460-2527
constellation Hydra

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


position, motion, parallax:

position (J2000) RA: 14h 46min 0,1sec DEC: -25 26' 35''
position (J1900) RA: 14h 40min 12,6sec DEC: -25 1' 7''
proper motion (J2000) RA: -0,15 arcsec/a DEC: -0,104 arcsec/a
radial velocity -13 km/s
rotational velocity 161 km/s (uncertain) (variable)
trigonometric parallax 0,049 arcsec
note (category: radial and/or rotational velocities): ADS 9375B, G3V, -20k/s.
note (category: dynamical parallaxes): 0.023".

magnitude

visual magnitude 4,94
(V on UBV Johnson system)

spectral / color information

spectral class F2III-IV
B-V-magnitude 0,35
U-B-magnitude 0,1

double/multiple star system information

separation 8,5 arcsec
mag difference (of double or brightest multiple) 2
note (category: double and multiple data): Binary, components F0V, G1V.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 14h 46min 0,28sec DEC: -25 26' 37,04'' 0,19 arcsec source: 16
proper motion (J2000) RA: -0,0086 arcsec/a DEC: -0,121 arcsec/a source: 25
radial velocity -13 km/s source: 25
trigonometric parallax 0,049 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 333,14 latitude: 30,63
GCI unit vector (J2000) X: -0,676301 Y: -0,598365 Z: -0,429623

magnitude:

visual 4,94 (observed) source: 25
photovisual 5 source: 2
photographic 5,5 source: 2

spectral information:

spectral class F5 source: 96
Morgan-Keenan F2III-IV source: 25
B-magnitude 5,29 0,05 B-V-magnitude 0,35
U-magnitude 5,39 0,05 U-B-magnitude 0,1

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 8,3 arcsec
magnitude difference between brightest and second brightest component 2
position angle 123

component magnitude spectral class catalogue(s)/name(s)
A 4,94 F5 54 Hya, HR 5497, HD 129926, SAO 182855
B - F9

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 (J1950) RA: 14h 43min 6,029sec DEC: -25 13' 55,15'' 0,021 arcsec
position (J2000) RA: 14h 46min 0,057sec DEC: -25 26' 35,25''
proper motion J1950 (FK4) RA: -0,0111 arcsec/a DEC: -0,107 arcsec/a 0,004 arcsec/a in RA
0,004 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0111 arcsec/a DEC: -0,103 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,2 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class F5
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: 19864
Durchmusterung CD-2411661A
Boss General Catalogue 19864
Henry Draper Catalogue 129926

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 14h 46min DEC: -25 27'
proper motion (J2000) RA: -0,144 arcsec/a DEC: -0,11 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
- 1783 49 139 9,6'' 5,1 7,1 F2V H 97
1991 123 8,3''

discoverer information:

discoverer code discoverer reference
H 97 Herschel, W. -

notes:

note H III 97. 54 Hya. Proper motion of B -116 -121.