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IAUC 8706: P/2006 H1; V5117 Sgr

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                                                  Circular No. 8706
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     R. H. McNaught reports his discovery on a comet on CCD images
taken with the 0.5-m Uppsala Schmidt (discovery observation
tabulated below) in the course of the Siding Spring Survey, the
object having an asteroidal head with a very weak, diffuse tail 8"
long in p.a. about 250 deg.  Following posting on the 'NEO
Confirmation Page', A. C. Gilmore reports that his CCD images taken
on Apr. 30.7 UT with the 1.0-m f/7.7 reflector at Mount John
through cirrus clouds show a small, condensed head with a narrow
tail to the west-southwest.  Images taken by J. Young with the
Table Mountain 0.6-m Cassegrain reflector on May 1.5 in twilight
show a round 6" coma with no noticeable central condensation and no

     2006 UT             R.A. (2000) Decl.       Mag.
     Apr. 29.78705   22 29 25.44   -19 35 46.1   17.9

The available astrometry, the following preliminary elliptical
orbital elements, and an ephemeris appear on MPEC 2006-J06.

     T = 2006 Feb. 24.566 TT          Peri. = 285.416
     e = 0.38667                      Node  = 357.078   2000.0
     q = 2.15508 AU                   Incl. =  13.045
       a =  3.51371 AU     n = 0.149642     P =   6.6 years

     D. K. Lynch, R. W. Russell, and R. J. Rudy, The Aerospace
Corporation; and C. E. Woodward, University of Minnesota, report
0.8- to 5.5-micron spectroscopy of V5117 Sgr (cf. IAUC 8673) on May
1 UT using SpeX at the Infrared Telescope Facility.  The nova is a
classical Fe II nova that is still in the low-excitation stage.  It
showed strong emission of the Brackett and Pashen lines, the
Lyman_beta-fluoresced O I lines, C I and N I, Fe II emission, and
weak He I 1.0830- and 2.0581-micron lines.  There was also a strong
continuum increasing to longer wavelengths, indicative of thermal
emission from dust.  The thermal continuum was well fitted by an
1100-K black body.  E(B-V) = 0.50 +/- 0.15 was obtained from the O
I lines.  Infrared magnitudes (+/- 0.1):  J = 10.6, H = 9.5, K =
     Visual magnitude estimates by A. Pearce, Nedlands, W.
Australia:  Feb. 20.842 UT, 10.1; 21.844, 10.1.  CCD red-magnitude
from D. Mendicini, Santa Fe, Argentina (provided by E. Waagen,
AAVSO):  Mar. 24.208, 10.5.

                      (C) Copyright 2006 CBAT
2006 May 4                     (8706)            Daniel W. E. Green

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