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telescope. University of Hawaii researcher Bo
Reipurth's preliminary studies have determined that McNeil's Nebula appeared when V1647 Ori, a pre-main sequence star, experienced an outburst called a FU Orionis or EX Lupii type event. Most stars are believed to undergo such events, though they are rarely observed.
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The nebula has been identified on images taken by Evered
Kreimer in October 1966, but not in various other images taken between 1951 and 1991. The nebula appears therefore to be very variable in luminosity, and is a reflection nebula illuminated by a variable star of some kind, or with the star's
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McNeil's Nebula is a cometary-type reflection nebula, illuminated by the reddish star V1647 Ori (also catalogued as IRAS 05436-0007) at its southern tip. The nebula did not appear in images taken before
September 2003; it was discovered in 2004 by amateur astronomer Jay McNeil using a 3-inch
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website reported that the nebula had disappeared. On
November 5, an observer using the 500-mm Gemini telescope at the Iowa Robotic Observatory reported its disappearance. Another observer using a 30-inch
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light being variably obscured for some reason. The nebula was not observed after 2004 until 2008, when it reappeared once more.
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198:on November 3 also failed to detect the nebula.
38:McNeil's Nebula in 2011 (upper) and 2006 (lower)
155:discovered January 23, 2004 by Jay McNeil of
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297:, 12 February 2004. Retrieved on 2008-06-29.
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163:. It is illuminated by the star V1647 Ori.
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228:Frommert, Hartmut; Kronberg, Christine.
319:Hannikainen, Diana (13 November 2018).
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82:−00° 05′ 48″
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321:"The Case of the Vanishing Nebula"
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291:New star emerges from dust cocoon
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369:Orion molecular cloud complex
275:Best of AOP: McNeil's Nebula
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230:"McNeil's Nebula near M78"
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307:McNeil's Nebula near M78
379:Orion (constellation)
189:In November 2018 the
325:Sky & Telescope
289:David Whitehouse. "
196:Dobsonian telescope
191:Sky & Telescope
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364:Reflection nebulae
185:2018 disappearance
112:1.3 x 0.95 arc min
99:Apparent magnitude
44:Observation data:
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109:Apparent diameter
26:Reflection nebula
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141:Lists of nebulae
134:EQ J054614-00058
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153:variable nebula
149:McNeil's Nebula
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66:Right ascension
59:variable nebula
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176:Earlier images
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131:Designations
349:CNN article
330:16 November
251:"V1647 Ori"
90:1,600
78:Declination
374:Protostars
358:Categories
202:References
139:See also:
167:Discovery
295:BBC News
260:July 10,
161:Kentucky
87:Distance
71:05 46 14
279:archive
235:11 July
157:Paducah
55:Subtype
255:Simbad
16:Nebula
151:is a
122:Orion
104:15-16
49:epoch
46:J2000
332:2018
262:2019
237:2019
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101:(V)
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