M47, an open cluster in
A map of the star field. Magnitudes are given without
a decimal point, e.g. 67 is to be interpreted as magnitude 6.7.
How to Find It
Starting from Sirius, follow the dim asterisms leading in a chain to M47.
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.
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
(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