d Scuti

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

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

catalogues and names d Sct, del Sct, HR 7020, HD 172748, SAO 142515, FK5: 1486, WDS 18423-0903A
constellation Scutum

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

position, motion, parallax:

position (J2000) RA: 18h 42min 16,4sec DEC: -9 3' 9''
position (J1900) RA: 18h 36min 47,9sec DEC: -9 8' 54''
proper motion (J2000) RA: 0,009 arcsec/a DEC: 0,002 arcsec/a
radial velocity -45 km/s
note: spectroscopic binaries
rotational velocity 32 km/s (uncertain) (variable)
trigonometric parallax 0,025 arcsec


visual magnitude 4,72
(V on UBV Johnson system)

spectral / color information

spectral class F2IIIpDel Del
B-V-magnitude 0,35
U-B-magnitude 0,14
R-I-magnitude 0,19

variability information

variable star identification Del Sct
note (category: variability): ADS 11581A, Delta Sct 4.98 - 5.16B, 0.193770d, 0.11636d. Beat period 5.24774d. Other periods 0.095129, 0.186872, 0.838d. This "prototype" Delta Sct star is the least typical of its class.

double/multiple star system information

number of components of multiple star system 3
separation 52,6 arcsec
mag difference (of double or brightest multiple) 4,5
component ID AC
note (category: double and multiple data): Component B, 10v, gK, optical. AC, CPM? A may be close binary, about 10d orbital period.

miscellaneous information

note (category: group membership): Hyades group.

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

position, motion, parallax:

position (J2000) RA: 18h 42min 16,432sec DEC: -9 3' 9,2'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0006 arcsec/a DEC: 0,002 arcsec/a source: 25
radial velocity -45 km/s source: 25
trigonometric parallax 0,025 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 23,84 latitude: -2,1
GCI unit vector (J2000) X: 0,181126 Y: -0,970792 Z: -0,15734


visual 4,6 (observed) source: 31
photovisual 4,7 source: 2
photographic 5 source: 2

spectral information:

spectral class F0 source: 96
Morgan-Keenan F2IIIpDeltaDel source: 25
B-magnitude 5,07 0,05 B-V-magnitude 0,35
U-magnitude 5,21 0,05 U-B-magnitude 0,14

variability information:

source of data: 30
variability type 150
var. amplitude 0,19
var. period 0,19
var. epoch 2443379
23. August 1977, 12:00:00 UT
next max light 2451621,96
18. March 2000, 11:02:24 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 15,2 arcsec
magnitude difference between brightest and second brightest component 7,5
position angle 46


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
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
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: 18h 39min 32,109sec DEC: -9 6' 7,26'' 0,005 arcsec
position (J2000) RA: 18h 42min 16,434sec DEC: -9 3' 9,19''
proper motion J1950 (FK4) RA: 0,0004 arcsec/a DEC: 0,001 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0006 arcsec/a DEC: 0,002 arcsec/a
source of proper motion data Determined by source catalog


visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class F0
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: 1486
Durchmusterung BD-09 4796
Boss General Catalogue 25580
Henry Draper Catalogue 172748

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

position and proper motion:

position (J2000) RA: 18h 42,3min DEC: -9 3'
proper motion (J2000) RA: 0,009 arcsec/a DEC: 0,002 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
AB 1938 3 46 15,2'' 4,7 12,2 F2IIIp RST4594
AC 1879 8 130 52,6'' 4,7 9,2 - H 36
1982 - 52,2''
AD 1982 1 265 110,1'' 4,7 10,5 - SLE 233

discoverer information:

discoverer code discoverer reference
RST4594 Rossiter, R.A. -
H 36 Herschel, W. -
SLE 233 Soulie, G. -


note Delta Scuti, prototype of the Delta Scuti variables. AC: H V 36.

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


position (J1950) RA: 18h 39min 32,1sec DEC: -9 6' 7''

variability informations:

variability type DSCT pulsating variable star
magnitute at max. brightness 4,6
magnitute at min. brightness 4,79
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2443379,05
23. August 1977, 13:12:00 UT
period [d] 0,1937697
next maximum light [JD] 2451622,013038
18. March 2000, 12:18:46 UT

spectral information

spectral class F3IIIp


to a study Vol. III GCVS
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'


ID in the GCVS catalogue 75/9004
constellation Sextans
notes on existence The star is equivalent to '0760001 R'.
There are notes in published catalog.

variability type description

variability type description
DSCT Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some
members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables.

Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.