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HD 198022


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GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies.
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GPM1 - a catalog of absolute proper motions of stars with respect to galaxies
The description of the first version of the General Compiled Catalogueof Absolute Proper Motions (GPM1) for a sample of HIPPARCOS stars,derived with respect to galaxies within the plan called Catalogue ofFaint Stars (KSZ, Deutch 1952), is presented. The principal aim of theGPM1 construction was to provide absolute proper motions of stars todetermine the rotation of the HIPPARCOS system. The GPM1 cataloguecontains 977 HIPPARCOS Input Catalogue stars with V magnitudes $5^m -11^m in 180 fields north of -25 degrees of declination. The accuracy ofthe proper motions is 8 mas/yr (milliarcseconds per year). Comparison ofproper motions of GPM1 with those of the PPM and ACRS was performed andanalyzed with respect to systematic errors caused by spurious rotationof the FK5 system. The standard errors show that the rotation may bedetermined with an accuracy better than 1 mas/yr. Catalog is onlyavailable in electronic form at the CDS via anonymous ftpcdsarc.u-strasbg.fr or ftp 130.79.128.5.

On the distance of dark clouds in the vicinity of the reflection nebula NGC 7023 in Cepheus
Distance to a group of dark clouds at moderate galactic latitudes Lynds1147, 1148, 1152, 1155, 1157, 1158, 1167, 1168, 1170, 1171, 1172, 1173,and 1174 is estimated from the extinction AV vs distance plot. Thisdependence is based on photometry of 79 stars down to V = 12.5 in theVilnius photometric system and their two-dimensional classification. Thedistance of the L1147/1158 group of clouds is found to be 325 +/- 13 pcand that of the L1167/1174 or NGC 7023 group of clouds is 288 +/- 25 pc.A number of stars with peculiar energy distribution has been found.

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관측 및 측정 데이터

별자리:케페우스자리
적경:20h43m48.47s
적위:+66°34'52.4"
가시등급:9.234
적경상의 고유운동:5.8
적위상의 고유운동:13.4
B-T magnitude:9.929
V-T magnitude:9.292

천체목록:
일반명   (Edit)
HD 1989HD 198022
TYCHO-2 2000TYC 4258-1264-1
USNO-A2.0USNO-A2 1500-07578354
HIPHIP 102312

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