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HD 1687


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Polaris Today
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Meridian observations made with the Carlsberg Automatic Meridian Circle at Brorfelde (Copenhagen University Observatory) 1981-1982
The 7-inch transit circle instrument with which the present position andmagnitude catalog for 1577 stars with visual magnitudes greater than11.0 was obtained had been equipped with a photoelectric moving slitmicrometer and a minicomputer to control the entire observationalprocess. Positions are reduced relative to the FK4 system for each nightover the whole meridian rather than the usual narrow zones. Thepositions of the FK4 stars used in the least squares solution are alsogiven in the catalog.

The reddening of Polaris
The B-V color excess of Polaris is obtained by using uvby-betaphotometry of 11 field stars within 0.75 deg of arc of Polaris anddereddening the field stars with the various color calibrations of theStromgren system. An apparent distance of 109 pc is estimated forPolaris, and a color excess of E(B-V) equals 0.02 + or - 0.02 is found.This result is taken as supporting the claims that Polaris is unreddenedor at worst very slightly reddened and therefore lies on the red edge ofthe Cepheid instability strip, as is expected for a small-amplitudeCepheid.

Mean places for 42 of the brighter stars within 1 of the NCP-1978.0.
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Positions and proper motions of stars observed with the polar telescope at Pulkovo.
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Osservazione e dati astrometrici

Costellazione:Orsa Minore
Ascensione retta:00h39m43.55s
Declinazione:+89°26'39.5"
Magnitudine apparente:8.126
Distanza:240.385 parsec
Moto proprio RA:-11.1
Moto proprio Dec:4.6
B-T magnitude:9.268
V-T magnitude:8.221

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 1687
TYCHO-2 2000TYC 4627-49-1
HIPHIP 3128
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