Gorgonea Tertia

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

catalogues and names Gorgonea Tertia, r Per, rho Per, 25 Per, HR 921, HD 19058, SAO 56138, FK5: 109
constellation Perseus

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

note (category: star names): Gorgonea Tertia.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 3h 5min 10,6sec DEC: +38 50' 25''
position (J1900) RA: 2h 58min 45,9sec DEC: +38 27' 10''
proper motion (J2000) RA: 0,13 arcsec/a DEC: -0,106 arcsec/a
radial velocity 28 km/s
trigonometric parallax 0,011 arcsec


visual magnitude 3,39
(V on UBV Johnson system)

spectral / color information

spectral class M4II
B-V-magnitude 1,65
U-B-magnitude 1,79
R-I-magnitude 1,62

variability information

variable star identification Rho Per
note (category: variability): SRb 3.30 - 4.0V, about 50d with possibly slow var. in mean brightness in 1100d period.

miscellaneous information

note (category: group membership): Zeta Her group.

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

position, motion, parallax:

position (J2000) RA: 3h 5min 10,593sec DEC: +38 50' 25,01'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0111 arcsec/a DEC: -0,106 arcsec/a source: 25
radial velocity 28 km/s source: 25
trigonometric parallax 0,011 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 149,6 latitude: -17,01
GCI unit vector (J2000) X: 0,538184 Y: 0,563062 Z: 0,627152


visual 3,3 (observed) source: 31

spectral information:

spectral class M0 source: 96
Morgan-Keenan M4II source: 25
B-magnitude 5,04 0,05 B-V-magnitude 1,65
U-magnitude 6,83 0,05 U-B-magnitude 1,79

variability information:

source of data: 30
variability type 194
var. amplitude 0,7
var. period 50


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
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 3h 1min 57,795sec DEC: +38 38' 52,86'' 0,005 arcsec
position (J2000) RA: 3h 5min 10,592sec DEC: +38 50' 25,02''
proper motion J1950 (FK4) RA: 0,0111 arcsec/a DEC: -0,102 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0111 arcsec/a DEC: -0,105 arcsec/a
source of proper motion data Determined by source catalog


visual 3,7 (accuracy: 2 decimals)
source of visual magnitude data Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class M3
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


source catalogue FK4, catalogue number: 109
Durchmusterung BD+38 630
Boss General Catalogue 3682
Henry Draper Catalogue 19058

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


position (J1950) RA: 3h 1min 57,8sec DEC: +38 38' 53''

variability informations:

variability type SRB pulsating variable star
magnitute at max. brightness 3,3
magnitute at min. brightness 4
photometric system visual, photovisual or Johnson's V
period [d] 50 (uncertain)

spectral information

spectral class M4IIb-IIIa


to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)


ID in the GCVS catalogue 63/9017
constellation Perseus
notes on existence The star is equivalent to '0639019 tau'.
There are notes in published catalog.

variability type description

variability type description
SRB Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V).

Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes;

Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;

Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days;

Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa).