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HD 199957


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관련 글

Photometric Measurements of the Fields of More than 700 Nearby Stars
In preparation for optical/IR interferometric searches for substellarcompanions of nearby stars, we undertook to characterize the fields ofall nearby stars visible from the Northern Hemisphere to determinesuitable companions for interferometric phase referencing. Because theKeck Interferometer in particular will be able to phase-reference oncompanions within the isoplanatic patch (30") to about 17th magnitude atK, we took images at V, r, and i that were deep enough to determine iffield stars were present to this magnitude around nearby stars using aspot-coated CCD. We report on 733 fields containing 10,629 measurementsin up to three filters (Gunn i, r and Johnson V) of nearby stars down toabout 13th magnitude at V.

Preliminary Version of the Third Catalogue of Nearby Stars
Not Available

UBV photometry of stars whose positions are accurately known. IV
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987A&AS...68..211O&db_key=AST

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관측 및 측정 데이터

별자리:고니자리
적경:20h59m14.07s
적위:+37°55'48.2"
가시등급:8.034
거리:380.228 파섹
적경상의 고유운동:0.7
적위상의 고유운동:-15.1
B-T magnitude:10.163
V-T magnitude:8.21

천체목록:
일반명   (Edit)
HD 1989HD 199957
TYCHO-2 2000TYC 3167-1165-1
USNO-A2.0USNO-A2 1275-14436197
HIPHIP 103580

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