T Vul

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 T Vul, HR 7988, HD 198726, SAO 89216

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

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

position, motion, parallax:

position (J2000) RA: 20h 51min 28,2sec DEC: +28 15' 2''
position (J1900) RA: 20h 47min 13,4sec DEC: +27 52' 32''
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,003 arcsec/a
radial velocity -1 km/s
note: spectroscopic binaries
trigonometric parallax 0,006 arcsec


visual magnitude 5,77
(V on UBV Johnson system)

spectral / color information

spectral class F5Ib
B-V-magnitude 0,72
U-B-magnitude 0,4
R-I-magnitude 0,38

variability information

variable star identification T Vul
note (category: variability): CDelta 5.44 - 6.06V, 4.435572d.

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

position, motion, parallax:

position (J2000) RA: 20h 51min 28,231sec DEC: +28 15' 1,91'' 0,35 arcsec source: 17
proper motion (J2000) RA: 0,0003 arcsec/a DEC: -0,003 arcsec/a source: 25
radial velocity -1 km/s source: 25
trigonometric parallax 0,006 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 72,14 latitude: -10,15
GCI unit vector (J2000) X: 0,599273 Y: -0,645626 Z: 0,473328


visual 5,4 (observed) source: 31
photographic 5,8 source: 16

spectral information:

spectral class F8 source: 96
Morgan-Keenan F5Ib source: 25
B-magnitude 6,49 0,05 B-V-magnitude 0,72
U-magnitude 6,89 0,05 U-B-magnitude 0,4

variability information:

source of data: 30
variability type 111
var. amplitude 0,68
var. period 4,44
var. epoch 2441705
22. January 1973, 12:00:00 UT
next max light 2451623,96
20. March 2000, 11:02:24 UT


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
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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: 20h 49min 20,753sec DEC: +28 3' 43,75'' 0,026 arcsec
position (J2000) RA: 20h 51min 28,222sec DEC: +28 15' 1,91''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: 0 arcsec/a 0,005 arcsec/a in RA
0,004 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0002 arcsec/a DEC: -0,004 arcsec/a
source of proper motion data Determined by source catalog


visual 5,4 (accuracy: 1 decimal)
source of visual magnitude data Source cited in source catalog introduction.

spectral information:

spectral class F8p
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 GC, catalogue number: 29089
Durchmusterung BD+27 3890
Boss General Catalogue 29089
Henry Draper Catalogue 198726

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


position (J1950) RA: 20h 49min 20,8sec DEC: +28 3' 44''

variability informations:

variability type DCEP pulsating variable star
magnitute at max. brightness 5,41
magnitute at min. brightness 6,09
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2441705,121
22. January 1973, 14:54:14 UT
period [d] 4,435462
next maximum light [JD] 2451622,814032
19. March 2000, 07:32:12 UT
rising time 32 % of period

spectral information

spectral class F5Ib-G0Ib


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


ID in the GCVS catalogue 88/3
constellation Vulpecula
notes on existence The star is equivalent to '0880004 U'.
There are notes in published catalog.

variability type description

variability type description
DCEP These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods.