HD 21070

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Optical images of MCLD123.5+24.9: a cloud illuminated by the North star? We present B R I images of a 1degr {x}1degr field centered on themolecular cloud (MCLD123.5+24.9) located in the large infrared cirrusknown as the Polaris Flare. The optical images are compared with IRASimages and an extinction map derived from stellar reddenings. We analysethe possibility for the North star (HD8890), only 1degr North of thefield, to be the source of MCLD123.5+24.9 optical emission. For widelyaccepted values of the dust albedo (omega = 0.6) and the assymetryparameter of the Henyey Greenstein phase function (0.7
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. Not Available
Coordinates of Polarissima BD +89 3 from I.A. Dyukov observations in 1932-1935. Not Available
Positions and proper motions of stars observed with the polar telescope at Pulkovo. Not Available
Photographic and photovisual magnitudes of stars in Harvard Standard C regions. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1958AJ.....63..474B&db_key=AST
Magnitudes and colors for 833 Northern and Southern stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955AJ.....60...65E&db_key=AST
A photometric system Not Available
The Transfer of the North Polar Standards to the Southern Hemisphere. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1953ApJ...117...83C&db_key=AST
Special Type, Magnitude, and Color-Index Relations in the Galactic Star Cluster in Coma Berenices. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952ApJ...116..612W&db_key=AST
On Magnitude Systems. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952ApJ...116..272J&db_key=AST
Photo-electric colours of B- and A-type stars in a number of Selected Areas Not Available
Variations in the Stellar Luminosity Function. V. a Region in Camelopardalis. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952ApJ...115..479M&db_key=AST
On the Color-Magnitude Diagram of the Pleiades. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...114..522J&db_key=AST
A Study of the Concentration of Early-Type Stars in Cygnus. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...114..492R&db_key=AST
Photoelectric Studies. VIII. Positional Effect in Photomultipliers and Some Revised Magnitudes in the North Polar Sequence and Harvard Region C 12. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...114..141E&db_key=AST
Photoelectric Magnitudes and Colors of Stars in Selected Areas 57, 61, and 68. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...112..469S&db_key=AST
The Color-Magnitude Array for the Galactic Cluster NGC 2362. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...112..240J&db_key=AST
Photoelectric Studies. I. Color-Luminosity Array for Members of the Hyades Cluster. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...111...65E&db_key=AST

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Pozíciós és asztrometriai adatok

Csillagkép:	Kis Medve
Rektaszcenzió:	09^h46^m20.47^s
Deklináció:	+89Â°34'09.9"
Vizuális fényesség:	9.048
RA sajátmozgás:	8.9
Dec sajátmozgás:	8.8
B-T magnitude:	9.368
V-T magnitude:	9.075

Katalógusok és elnevezések:

Megfelelő nevek	(Edit)
HD 1989	HD 21070
TYCHO-2 2000	TYC 4643-23-1
HIP	HIP 47953

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