M47, an open cluster in
Puppis
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A map of the star field. Magnitudes are given without
a decimal point, e.g. 67 is to be interpreted as magnitude 6.7. |
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How to Find It
Starting from Sirius, follow the dim asterisms leading in a chain to M47.
Comments
An enjoyable view even from light-polluted areas, provided that it is
high enough above the horizon. The cluster is bracketed by two bright stars, of
magnitudes 5.6 and 6.4. Cutting diagonally through the center is a chain of four
7th and 8th magnitude stars; the innermost two of these actually consist of a magnitude
7.9 star on top plus an unresolved pair of magnitude 7.9 stars under it. The two
5th magnitude stars are not part of the cluster.
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| 60-degree field of view |
| Data (Janes, Duke, and Lynga, 1987) |
| RA | 07 37 |
| dec | -14 30 |
| total V magnitude | 4.4 |
| NGC number | 2422 |
| Trumpler class | I 3 m |
| angular diameter | 25' |
| distance | 470 pc |
| age (Myr) | 78 |
| integrated B-V | .02 |
| observed stars | 117 |
| earliest sp. class | B3 |
| brightest star | 5.0 |
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(c) Copyright 1998 Benjamin Crowell. All right reserved.
Photos from the Digitized Sky Survey, stdatu.stsci.edu/dss/dss_form.html
Sky maps created by Your Sky, www.fourmilab.com
