NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC6813
Basic Information
Location and Magnitude
Right Ascension: 19:40:24.0
Declination: +27:18:34
Constellation: VUL
Visual Magnitude:
Historic Information
Discoverer: Marth
Year of discovery: 1864
Discovery aperture: 48.0
Observational
Summary description: ** in vF, S neb
Sub-type: EN
Corwin's Notes
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NGC 6813. This was found by Marth who called it a "D * in vF, S neb". In the
current literature, it has drawn attention as an IRAS source (it is
IRAS 19383+2711), and searched for -- unsuccessfully -- in CO and
water/methanol maser surveys. It has also been called a planetary nebula, a
reflection nebula, and a star cluster.
My guess, based on all of this, is that the object is a young star cluster
with some of its nebulosity still intact. It is brightest on the red DSS
images with an irregularly-extended, rather faint corona. As Marth saw, there
are two stellar images toward the center, both detected in the 2MASS and UCAC
surveys. I've adopted a mean position for the two 2MASS sources as being
representative of the object.
Steve's Notes
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NGC 6813
18" (7/12/07): picked up at 115x as a small, hazy glow surrounding a mag 13.5 star. Adding an OIII filter, this emission nebula appeared as a moderately bright, round, 1.5' glow surrounding the star. At 174x the center "star" appears double and the nebulosity responds well to an OIII filter. At 225x, the two close central stars are cleanly resolved and a third fainter star is just at the northern edge. Adding a UHC filter, the shape is irregular and the overall outline shifts with averted vision, though it does not appear to be larger than 1.2'-1.5' visually despite a catalogued diameter of 3'.
17.5" (6/15/91): at 140x, fairly faint emission nebulosity, round, 1.5' diameter. Surrounds a very close mag 14 double star. Using an OIII filter the nebulosity is very prominent and increases to 3' in size. Located 3' SE of mag 9 SAO 87539.