Electronic Telegram No. 3828
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET C/2014 E2 (JACQUES)
     Cristovao Jacques, Belo Horizonte, Brazil, reports his discovery of a
comet on CCD images taken by himself with E. Pimentel and J. Barros using a
0.45-m f/2.9 reflector at the SONEAR Observatory near Oliveira, Brazil
(discovery observations tabulated below).  The object shows a strongly
condensed coma of diameter 35" and a fan-like tail 65" long toward p.a.
290-343 degrees.

     2014 UT             R.A. (2000) Decl.       Mag.   Observer
     Mar. 13.05987   12 12 08.07   -37 16 30.3   14.7   Jacques
          13.07103   12 12 04.34   -37 16 27.3   15.0     "
          13.08056   12 12 01.05   -37 16 25.5   14.9     "
          13.26328   12 10 59.50   -37 16 18.9   15.0     "
          13.26487   12 10 58.97   -37 16 17.6   15.1     "
          13.26645   12 10 58.47   -37 16 17.0   15.2     "

After posting on the Minor Planet Center's NEOCP and PCCP webpages, numerous
CCD astrometrists elsewhere have also commented on the object's cometary
appearance.  H. Sato, Tokyo, Japan, communicates that six stacked 30-s images
taken on Mar. 13.6 UT with an iTelescope 0.51-m f/6.8 astrograph show the
object to have a strongly condensed coma of diameter 50" and a tail 3' long
toward p.a. 15 degrees; the luminance-filtered magnitude as measured within a
circular aperture of radius 26".3 was 12.4.  M. Urbanik, Cadca, Slovak
Republic, notes that eight stacked 30-s images taken with an iTelescope
0.32-m f/9.3 astrograph at Siding Spring on Mar. 13.6 show a coma 30" wide
with a diffuse tail at least 2' long spanning p.a. 10-30 deg.  E. Guido,
N. Howes, and M. Nicolini obtained nineteen 30-s unfiltered exposures remotely
with an iTelescope 0.50-m f/6.8 astrograph at Siding Spring on Mar. 13.6;
their stacked images show a very bright coma of red mag 13.8-13.9 nearly 2' in
diameter and elongated in p.a. 10 deg.  T. Prystavski writes that five 38-s
exposures taken on Mar. 13.75-13.76 by A. Novichonok through an iTelescope
0.32-m f/9.3 Ritchey-Chretien telescope (+ Luminance filter) at Siding Spring
revealed a large and very diffuse coma approximately 2'.8 in diameter with
total mag near 11.5 and a tail 2'.4 long in p.a. 16 deg.  Images obtained by
T. Linder and R. Holmes on Mar. 14.09 with a 0.41-m f/11 Ritchey-Chretien
telescope at Cerro Tololo (measured by Linder, Holmes, and K. Baker) show
an elongated coma with a broad tail spanning p.a. 300 deg-60 deg.
     The available astrometry, the following very preliminary parabolic
orbital elements by G. V. Williams, and an ephemeris appear on MPEC 2014-E84.

     T = 2014 June 29.5244 TT         Peri. = 349.1077
                                      Node  =  58.4814  2000.0
     q = 0.606313 AU                  Incl. = 157.1941


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 March 14                    (CBET 3828)              Daniel W. E. Green