S Hya


The object was found in the following catalogues:
  1. SKY2000 - Master Star Catalog

  2. Smithsonian Astrophysical Observatory Star Catalog

  3. Combined General Catalogue of Variable Stars (Vol. I-III)


catalogues and names S Hya, HD 76011, SAO 117236

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

position, motion, parallax:

position (J2000) RA: 8h 53min 33,921sec DEC: +3 4' 6,81'' 0,43 arcsec source: 16
proper motion (J2000) RA: -0,0006 arcsec/a DEC: 0,011 arcsec/a source: 16
radial velocity 74 km/s source: 11
galactic coord. (B1950) longitude: 224,99 latitude: 28,42
GCI unit vector (J2000) X: -0,685993 Y: 0,725637 Z: 0,053531

magnitude:

visual 11,85 (observed) source: 20
photographic 8,8 source: 16

spectral information:

spectral class M0 source: 96
Morgan-Keenan M4e-M8.0e source: 30
B-magnitude 13,24 0,02 B-V-magnitude 1,39
U-magnitude 13,54 0,02 U-B-magnitude 0,3

variability information:

source of data: 30
variability type 180
var. amplitude 6,1
var. period 256,63
var. epoch 2443509
31. December 1977, 12:00:00 UT
next max light 2451721,16
25. June 2000, 15:50:24 UT

sources:

11 General Catalogue of Stellar Radial Velocities
Wilson, R.E., General Catalogue of Stellar of Stellar Radial Radial Velocities, Washington, DC: Carnegie Institute of Washington, 1953
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
20 Catalogue of Homogeneous Means in the UBV System
Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 1994
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 8h 50min 57,491sec DEC: +3 15' 30,38'' 0,041 arcsec
position (J2000) RA: 8h 53min 33,907sec DEC: +3 4' 6,68''
proper motion J1950 (FK4) RA: -0,0007 arcsec/a DEC: 0,01 arcsec/a 0,007 arcsec/a in RA
0,006 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0005 arcsec/a DEC: 0,013 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 7,3 (accuracy: 1 decimal)
source of visual magnitude data Source cited in source catalog introduction.

spectral information:

spectral class M3e
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue GC, catalogue number: 12278
Durchmusterung BD+03 2085
Boss General Catalogue 12278
Henry Draper Catalogue 76011

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 8h 50min 57,5sec DEC: +3 15' 30''

variability informations:

variability type M pulsating variable star
magnitute at max. brightness 7,2
magnitute at min. brightness 13,3
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2443509
31. December 1977, 12:00:00 UT
period [d] 256,63
next maximum light [JD] 2451721,16
25. June 2000, 15:50:24 UT
rising time 49 % of period

spectral information

spectral class M4e-M8.0e

references

to a study the main characteristics of the star was determined by the authors themselves
to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 42/2
constellation Hydra
notes on existence The star is equivalent to '0420003 T'.

variability type description

variability type description
M Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they
usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR).