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M78 and the newly discovered McNeil's Object

Discovery announcement from IAUC 8284 - 9th February 2004
A report was received from J. W. McNeil, Paducah, KY, of the appearance of a new nebula in a dense region of the Lynds 1630 cloud in Orion, and apparently associated with IRAS 05436-0007, on his unfiltered CCD images taken with a 7.6-cm refractor on Jan. 23 UT. The object, which is located at R.A. = 5h46m14s, Decl. = -0o05'.8 (equinox 2000.0), was then of total mag about 15-16 (with his CCD camera's sensitivity peaking at 575 nm), but it is not present on seven Digitized Sky Survey images from 1951 to 1991. B. Reipurth, University of Hawaii (UH), confirms that a faint optical counterpart to IRAS 05436-0007 has gone into outburst and has produced a large reflection nebulosity, based on preliminary examination of red broadband CCD images obtained with K. Meech at the UH 2.2-m telescope on Jan. 31. Reipurth adds that this is a very rare event, apparently similar to that involving IRAS 05380-0728 (cf. Reipurth and Bally 1986, Nature 320, 336). The outburst may be an EX-Lup-type or FU-Ori-type eruption, driven by a sudden increase of accretion through a circumstellar disk, and thus in urgent need of observation (see Herbig 1977, Ap.J. 217, 693; Lehmann et al. 1995, A.Ap. 300, L9; Hartmann and Kenyon 1996, ARAA 34, 207). Reipurth also notes that HH 22 is in the line-of-sight of this new nebula but is not physically involved with the nebula

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File information
Album name:Whitters / Messier Objects
Rating (2 votes):33333
Link-words:Messier / Nebula / Star
Image date, time and location:22nd February 2004 22:20
Telescope aperture and focal ratio:MX916 camera, a Tamron 300mm F2.8 lens, operating at f4, and an original Lumicon Hydrogen Alpha filter. Taken on 22/02/2004, between 22:20:37 - 22:49:22 Fifteen x 240 seconds exposures stacked using AIP for Windows, 30 minutes total integration. - OAS Dee
Filesize:250 KiB
Date added:Feb 26, 2004
Dimensions:600 x 509 pixels
Displayed:281 times
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