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Multichannel astrometric photometer and photographic astrometric studies in the regions of Lalande 21185, BD 56 deg 2966, and HR 4784The parallaxes of stars determined from the multichannel astrometric photometer (MAP) in the regions of Lalande 21185, BD 56 deg 2966, and from photographic plates in the region of BD 56 deg 2966 and the region of HR 4783 and HR 4784 are reported. The parallax determined for Lalande 21185, 395.1 +/-1.0 mas yields what is believed to be the most precise distance modulus (-2.984 +/-0.0055) known for a star other than the sun. The absolute magnitude of Lalande 21185 is found to be 10.474 +/-0.008. No significant evidence of unseen companions is detected. The photographic study of BD 56 deg 2966 indicates that the long-term (65 yr) motion of the star is linear to better than +/-16 mas, while the MAP study indicates that the motion is linear to better than +/-2.5 mas over a period of some 5 yr. The photographically determined parallaxes are compared with those observed with the MAP. The photographically calculated standard errors are found to be in agreement with the standard error of the differences.
Document ID
19920071804
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gatewood, George
(NASA Ames Research Center Moffett Field, CA, United States)
Stein, John
(NASA Ames Research Center Moffett Field, CA, United States)
De Jonge, Joost K.
(NASA Ames Research Center Moffett Field, CA, United States)
Persinger, Timothy
(NASA Ames Research Center Moffett Field, CA, United States)
Reiland, Thomas
(Allegheny Observatory Pittsburgh, PA, United States)
Stephenson, Bruce
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Astronomical Journal
Volume: 104
Issue: 3 Se
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
92A54428
Funding Number(s)
CONTRACT_GRANT: NAG2-53
CONTRACT_GRANT: NSF AST-86-17642
Distribution Limits
Public
Copyright
Other

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