{"id":234,"date":"2010-01-16T22:28:00","date_gmt":"2010-01-16T22:28:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2010\/01\/16\/ngc_2244_and_sh\/"},"modified":"2021-11-28T02:53:51","modified_gmt":"2021-11-28T02:53:51","slug":"ngc_2244_and_sh","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2010\/01\/16\/ngc_2244_and_sh\/","title":{"rendered":"NGC 2244 and Sh 2-275 – The Rosette Nebula"},"content":{"rendered":"
\"Sketch<\/a><\/p>\n

Sketch of NGC 2244 (NGC 2239) and Sh 2-275 (Rosette Nebula)<\/p>\n

Click image to view larger version.<\/i><\/p>\n<\/div>\n

Observation Notes:<\/b><\/p>\n

If you find yourself at a dark site with Orion and Monoceros sprawled across the meridian, don’t pass up this gorgeous showpiece of the winter sky. While at Sunset Crater National Monument, working on a set of observing\/sketching projects, I spent an hour re-observing the nebulosity surrounding the cluster. I used a tracing of my previously sketched star field as a starting point to save time.<\/p>\n

As before, the nebulosity was visible unfiltered, but adding the Ultrablock filter helped immensely. The central hollow was bordered by a rather straight run of nebulosity to the north. The western edge of the hollow peeled away along the northwest edge, forming a beak-like appendage. The nebula seemed to curl away on the southwestern side, allowing an opening to form on the south edge of the central void. Two nested arcs of nebulosity wrapped the east side to complete the shroud. Further out on the north east edge of the field, some more smoky structure emerged. That striking yellow-orange star still popped out along the southeast edge of the central rim.<\/p>\n

To allow better control over the shading, I prepared this sketch in a large, 6 inch (15 cm) circle. I used an artist’s chamois loaded with graphite to softly rough in the broad swaths of nebulosity. I then followed up with a graphite-loaded blending stump to build up the details and variations in luminosity.<\/p>\n

Object Information:<\/b><\/p>\n

The common designation NGC 2244 refers to the cluster of stars at the center of this stellar nursery. The nebulous region is described by the designations NGC 2237, 2238 and 2246. This nebula and star cluster is more than 1 degree across. Star formation is still in progress. This object lies about 5,500 light years away, and is about 130 light years in diameter. The open cluster (NGC 2244) was discovered in 1690 by Flamsteed. The nebulous regions were later discovered by John Herschel, Marth, and Swift.<\/p>\n

\"Sketch\/DSS<\/p>\n

Sketch\/DSS Photo Comparison of NGC 2244 (NGC 2239)
\nand Sh 2-275 (The Rosette Nebula)<\/p>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nNebula: Sh 2-275 (The Rosette Nebula)
\n— Includes NGC 2237, 2238, 2246
\nOpen Cluster: NGC 2244 (NGC 2239)<\/td>\n<\/tr>\n
Other Desig.<\/b><\/td>\nNGC 2244:<\/b> NGC 2239, Lund 222, h 392, GC 1420, OCL 515, Cr 99, Mel 47, CED 76B
\nSh 2-275:<\/b> NGC 2246, NGC 2237, NGC 2238, LBN 948, LBN 949, Sh2-274, GC 5361, CED 76A,<\/td>\n<\/tr>\n
Classification*<\/b><\/td>\nOpen Cluster (III 2 m n) and Emission Nebula<\/td>\n<\/tr>\n
Position*<\/b><\/td>\nMonoceros [RA: 06:31:55.6 \/ Dec: +04:56:35]<\/td>\n<\/tr>\n
Size*<\/b><\/td>\nNGC 2244: 24′
\nSh 2-275: 80′ x 60′<\/td>\n<\/tr>\n
Brightness*<\/b><\/td>\nNGC 2244: 4.8 bMag
\nSh 2-275: 6.0 bMag<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nJanuary 15, 2010 – 12:00 AM MST
\n(January 15, 2010 – 07:00 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nCinder Hills Overlook, Sunset Crater National Monument, Arizona<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion SkyQuest XT8 Dobsonian (203 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n32 mm Sirius Plossl (37.5X \/ 88′ TFOV)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, cold, breezy<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n5\/10<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nMag 7+<\/td>\n<\/tr>\n
*Sources<\/b><\/td>\nNGC\/IC Project<\/a>
\nSEDS<\/p>\n

<\/a><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n

February 24, 2006 Observation:<\/b><\/p>\n

\"Step<\/a>
\n