NGC 2451 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Puppis (Pup) · Contains: NGC 2451 · c Pup

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NGC 2451

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NGC 2451

This object is a beautiful open cluster located 600 light years away in the southern constellation of Puppis. It is one of the earliest sky object discoveries, by Giovanni Battista Hodierna around 1650.

The brightest star in the center, 3.6 magnitude c Puppis, has been called many different colors by astronomers over the years, from very red, to orange, to yellow. It looks orange to me in this calibrated image.

Like many other open clusters, astronomers have debated whether this was truly a cluster or simply a collection of bright stars. In 1994, German astronomers Siegfried Roser and Ulrich Bastian determined that many of the bright stars with similar proper motion belonged to a cluster called the Puppis Moving Group (NGC 2451a). They also proposed, and it was later confirmed, that a second distant cluster (NGC 2451b) exists further away at 1200 light years along the same line of sight. I cannot see an indication of a distant cluster in this image.

The refractors!
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ZWO ASI1600MM/QHY163M
Open Star Clusters

Open Clusters

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	1914407
PixInsight job	973K94NP2KHKKQREKPS99PS44DV83NFN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	07h45m15s.500
RA (top/left)	07h48m32s.362
RA (top/right)	07h43m59s.220
RA (bottom/right)	07h41m57s.322
RA (bottom/left)	07h46m32s.960

Dec (center)	-37°59′20″.56
Dec (top/left)	-37°54′47″.22
Dec (top/right)	-37°23′05″.10
Dec (bottom/right)	-38°03′33″.47
Dec (bottom/left)	-38°35′33″.16

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NGC 2451

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