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 d1Aps, del 1 Aps, HR 6020, HD 145366, SAO 257380, FK5: 1424, WDS 16203-7842A
constellation Apus

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

position, motion, parallax:

position (J2000) RA: 16h 20min 20,8sec DEC: -78 41' 45''
position (J1900) RA: 16h 5min 23,5sec DEC: -78 26' 37''
proper motion (J2000) RA: -0,014 arcsec/a DEC: -0,035 arcsec/a
radial velocity -12 km/s
trigonometric parallax 0,02 arcsec


visual magnitude 4,68
(V on UBV Johnson system)

spectral / color information

spectral class M5IIIb
B-V-magnitude 1,69
U-B-magnitude 1,69
R-I-magnitude 1,33 (Eggen)

variability information

variable star identification Del1 Aps
note (category: variability): Lb? 4.66 - 4.87V.

double/multiple star system information

number of components of multiple star system 3
separation 102,9 arcsec
mag difference (of double or brightest multiple) 0,4
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): Physical pair with HR 6021.

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

position, motion, parallax:

position (J2000) RA: 16h 20min 20,764sec DEC: -78 41' 44,68'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0047 arcsec/a DEC: -0,035 arcsec/a source: 25
radial velocity -12 km/s source: 25
trigonometric parallax 0,02 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 312,42 latitude: -19,89
GCI unit vector (J2000) X: -0,082573 Y: -0,177778 Z: -0,9806


visual 4,66 (observed) source: 30
photovisual 4,8 source: 2

spectral information:

spectral class M0 source: 96
Morgan-Keenan M5IIIb source: 25
B-magnitude 6,37 0,05 B-V-magnitude 1,69
U-magnitude 8,06 0,05 U-B-magnitude 1,69

variability information:

source of data: 30
variability type 171
var. amplitude 0,21

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 102,9 arcsec
magnitude difference between brightest and second brightest component 0,59
position angle 12


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
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: 16h 12min 48,049sec DEC: -78 34' 25,65'' 0,011 arcsec
position (J2000) RA: 16h 20min 20,785sec DEC: -78 41' 44,95''
proper motion J1950 (FK4) RA: -0,0017 arcsec/a DEC: -0,037 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0045 arcsec/a DEC: -0,038 arcsec/a
source of proper motion data Determined by source catalog


visual 4,8 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class M3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 1424
Durchmusterung CP-78 1092
Boss General Catalogue 21862
Henry Draper Catalogue 145366

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

position and proper motion:

position (J2000) RA: 16h 20,3min DEC: -78 42'
proper motion (J2000) RA: -0,014 arcsec/a DEC: -0,035 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 1872 3 12 102,9'' 4,68 5,27 M5IIIb BSO 22
AC 1918 1 74 90,5'' 4,68 12,5 - BSO 22

discoverer information:

discoverer code discoverer reference
BSO 22 - -


note Delta (1) Aps, an irregular variable. B is CPD-78@1093, spectrum K3III. Proper motion of B -010 -032.

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


position (J1950) RA: 16h 12min 48sec DEC: -78 34' 26''

variability informations:

variability type LB: pulsating variable star
magnitute at max. brightness 4,66
magnitute at min. brightness 4,87
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M4-M5III


to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Cape Photographic Durchmusterung'


ID in the GCVS catalogue 3/90041
constellation Apus
There are notes in published catalog.

variability type description

variability type description
LB Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).