Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Citations to the Article (11) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (39)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Improved Hipparcos Parallaxes of Coma Berenices and NGC 6231
Authors:
Makarov, Valeri V.
Affiliation:
AA(Universities Space Research Association, 300 D Street, SW, Suite 801, Washington, DC 20036; and US Naval Observatory, 3450 Massachusetts Avenue, NW, Washington, DC 20392; )
Publication:
The Astronomical Journal, Volume 126, Issue 5, pp. 2408-2410. (AJ Homepage)
Publication Date:
11/2003
Origin:
UCP
AJ Keywords:
Astrometry, Galaxy: Open Clusters and Associations: Individual: Name: Coma, Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 6231, Stars: Distances
DOI:
10.1086/378483
Bibliographic Code:
2003AJ....126.2408M

Abstract

A method to reprocess the Hipparcos Intermediate Astrometry Data that reduces the propagation of the along-scan spacecraft attitude errors was developed and successfully used to obtain a more consistent parallax of the Pleiades (Makarov, published in 2002). The same technique is used now to correct the Hipparcos parallaxes of the Coma Berenices and NGC 6231 open clusters, which are also in error. The new mean parallax of Coma is 12.40+/-0.17 mas (against previously 11.43 mas) and of NGC 6231 1.7+/-0.4 mas (against previously -0.8 mas). The new data for Coma are in excellent agreement with the pre-Hipparcos main-sequence fitting estimates. All six members of NGC 6231 that have negative parallaxes in Hipparcos obtain positive parallaxes. These results suggest that the main source of astrometric error has been correctly identified, and that a more accurate Hipparcos catalog can be computed.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints