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IAUC 8846: V1281 Sco; V2615 Oph; C/2007 D4, C/2007 D5, C/2007 E4, C/2007 E5

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IAUC number 

                                                  Circular No. 8846
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


V1281 SCORPII
     R. W. Russell, R. J. Rudy, D. K. Lynch, S. Mazuk, and R. L.
Pearson, The Aerospace Corporation; C. E. Woodward, University of
Minnesota; R. C. Puetter, Center for Astrophysics and Space Science,
University of California at San Diego; and R. B. Perry, Langley
Research Center, NASA, report 0.4- to 2.5-micron spectroscopy of
this nova (cf. IAUC 8810, 8812) using the Lick 3-m telescope (+
VNIRIS) on May 6 UT, as well as 0.8- to 5.5-micron spectroscopy
using the Infrared Telescope Facility (IRTF) 3-m telescope (+ SpeX)
on May 31.  This object has faded considerably over the past month,
but the character of its rather complex spectrum has not changed
significantly.  The spectrum has broad and clearly doubled lines
and is dominated by He I emission features.  O I is still present,
and the forbidden lines [O II], [O III], and [N II] are present.
There are no indications of coronal lines or dust formation.  The
interstellar reddening derived from the O I lines is E(B-V) = 0.7.


V2615 OPHIUCHI
     Rudy, Lynch, Mazuk, Russell, Pearson, Woodward, Puetter, and
Perry, also report 0.4- to 2.5-micron spectroscopy of V2615 Oph
(cf. IAUC 8824), obtained at Lick as above on May 7 UT, and 0.8- to
5.5-micron spectroscopy, obtained at the IRTF as above on May 31.
This nova evolved dramatically between the two observations due to
the formation of dust.  The reddening derived from the O I lines
jumped from E(B-V) = 1.0 to 1.3.  The emission-line spectrum
remained very rich and of low excitation with numerous features of
Fe II and N I.  The infrared Ca II triplet was present, and the C I
lines were unusually strong, even for a nova.  The carbon-monoxide
emission reported by Das et al. on CBET 925 was no longer present.


COMETS C/2007 D4, C/2007 D5, C/2007 E4, C/2007 E5 (SOHO)
     Four additional Kreutz-sungrazing comets have been found on
SOHO website images (cf. IAUC 8845) -- the "discovery" data
tabulated below -- all being very faint and stellar in appearance.

 Comet        2007 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2007 D4    Feb. 16.613   22 19.3  -13 43   C3     HS   2007-K66
 C/2007 D5         18.821   22 24.0  -12 36   C3     AK   2007-K68
 C/2007 E4    Mar.  2.904   23 09.7  - 7 55   C3     BZ   2007-K66
 C/2007 E5          9.721   23 33.8  - 5 10   C3     VB   2007-K68

                      (C) Copyright 2007 CBAT
2007 June 11                   (8846)            Daniel W. E. Green

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