[Iaude] CBET 4702: COMET P/2019 X1
quai at eps.harvard.edu
quai at eps.harvard.edu
Tue Dec 10 17:04:23 EST 2019
Electronic Telegram No. 4702
Central Bureau for Astronomical Telegrams
Mailing address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
COMET P/2019 X1 (PRUYNE)
Theodore A. Pruyne, Lunar and Planetary Laboratory, University of
Arizona, reports his discovery of a comet on CCD exposures taken on Dec. 2 UT
with the Mt. Lemmon Survey's 1.5-m reflector (discovery observations tabulated
below), the comet described as showing a coma that is roughly 15" across and
a tail about 16" long in p.a. about 260 degrees. D. Rankin obtained
confirming CCD images with the Steward Observatory 1.0-m reflector at Mt.
Lemmon on Dec. 3.3 UT, in which the comet appeared diffuse with a diameter of
about 12" and magnitude 19.4-19.9.
2019 UT R.A. (2000) Decl. Mag. Observer
Dec. 2.36583 7 07 29.09 +32 48 29.2 19.4 Pruyne
2.37102 7 07 28.98 +32 48 30.1 19.6 "
2.37620 7 07 28.84 +32 48 31.0 19.3 "
2.38138 7 07 28.71 +32 48 32.0 19.5 "
After the comet was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists have commented on the cometary appearance. R. Weryk,
Institute for Astronomy, University of Hawaii, notes that two 45-s w-band
exposures taken on Dec. 3.5 UT with the 1.8-m Pan-STARRS1 reflector at
Haleakala in 1".2 seeing show a very condensed coma of diameter 1".4 and a
straight tail 12" long in p.a. 265 deg. Weryk also found a single pre-
discovery image of the comet moving over a bright star on Nov. 29.64, showing
a tail in p.a. about 270 degrees, with the magnitude measured as 19.5.
K. Sarneczky and B. Cseh, Konkoly Observatory, report that fifteen stacked
120-s unfiltered CCD images taken with the 0.60-m Schmidt telescope at
Piszkesteto, Hungary, on Dec. 4.0 show a very condensed coma 4" in diameter
and a very faint, straight tail about 10" long in p.a. 270 deg. Twelve
stacked 120-s unfiltered exposures taken by G. Favero and R. Furgoni with a
0.80-m f/4 reflector at Castello Tesino, Italy, on Dec. 5.9 show an elongated
coma of red mag 19.0 and a faint tail about 11" long in p.a. 270 deg.
The available astrometry appear on MPEC 2019-X103. S. Nakano, Sumoto,
Japan, provides the following preliminary elliptical orbital elements from 73
observations spanning Nov. 29-Dec. 10 (mean residual 0".42), adding that the
orbital period is uncertain by +/- 160 days.
T = 2019 July 22.1866 TT Peri. = 36.7615
e = 0.300463 Node = 43.9695 2000.0
q = 4.317072 AU Incl. = 10.2821
a = 6.171326 AU n = 0.0642890 P = 15.33 years
The following ephemeris by the undersigned from the above orbital elements
used photometric power-law parameters H = 10.0 and 2.5n = 10 for the
magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2019 09 14 06 44.90 +29 46.1 4.546 4.324 71.0 12.7 19.6
2019 09 19 06 49.02 +29 52.9 4.476 4.325 74.9 13.0 19.6
2019 09 24 06 52.86 +30 00.1 4.405 4.327 79.0 13.2 19.6
2019 09 29 06 56.41 +30 07.8 4.333 4.328 83.1 13.3 19.5
2019 10 04 06 59.64 +30 16.1 4.261 4.330 87.3 13.3 19.5
2019 10 09 07 02.54 +30 25.0 4.188 4.332 91.6 13.3 19.5
2019 10 14 07 05.07 +30 34.7 4.116 4.334 95.9 13.2 19.4
2019 10 19 07 07.23 +30 45.2 4.044 4.336 100.4 13.1 19.4
2019 10 24 07 08.98 +30 56.5 3.973 4.338 104.9 12.8 19.4
2019 10 29 07 10.32 +31 08.6 3.905 4.340 109.6 12.5 19.3
2019 11 03 07 11.23 +31 21.6 3.838 4.343 114.4 12.0 19.3
2019 11 08 07 11.68 +31 35.3 3.775 4.345 119.2 11.5 19.3
2019 11 13 07 11.69 +31 49.6 3.714 4.348 124.1 10.9 19.2
2019 11 18 07 11.24 +32 04.5 3.658 4.350 129.2 10.1 19.2
2019 11 23 07 10.34 +32 19.7 3.606 4.353 134.3 9.4 19.2
2019 11 28 07 09.00 +32 35.1 3.559 4.356 139.4 8.5 19.1
2019 12 03 07 07.24 +32 50.4 3.518 4.359 144.6 7.5 19.1
2019 12 08 07 05.09 +33 05.3 3.483 4.363 149.8 6.5 19.1
2019 12 13 07 02.60 +33 19.5 3.454 4.366 154.9 5.5 19.1
2019 12 18 06 59.81 +33 32.8 3.432 4.369 159.8 4.5 19.1
2019 12 23 06 56.79 +33 44.8 3.418 4.373 164.3 3.5 19.1
2019 12 28 06 53.60 +33 55.4 3.411 4.376 167.6 2.8 19.1
2020 01 02 06 50.33 +34 04.3 3.411 4.380 168.9 2.5 19.1
2020 01 07 06 47.04 +34 11.4 3.419 4.384 167.4 2.8 19.1
2020 01 12 06 43.82 +34 16.6 3.435 4.388 163.8 3.6 19.1
2020 01 17 06 40.75 +34 20.0 3.458 4.392 159.3 4.5 19.1
2020 01 22 06 37.89 +34 21.4 3.488 4.396 154.4 5.5 19.1
2020 01 27 06 35.31 +34 21.1 3.525 4.400 149.3 6.6 19.2
2020 02 01 06 33.07 +34 19.2 3.569 4.405 144.1 7.5 19.2
2020 02 06 06 31.21 +34 15.9 3.618 4.409 138.9 8.4 19.2
2020 02 11 06 29.76 +34 11.2 3.673 4.414 133.8 9.3 19.3
2020 02 16 06 28.75 +34 05.5 3.733 4.419 128.7 10.0 19.3
2020 02 21 06 28.19 +33 58.9 3.797 4.423 123.7 10.7 19.4
2020 02 26 06 28.09 +33 51.6 3.865 4.428 118.8 11.3 19.4
2020 03 02 06 28.44 +33 43.6 3.937 4.433 114.0 11.8 19.4
2020 03 07 06 29.25 +33 35.1 4.011 4.438 109.3 12.2 19.5
2020 03 12 06 30.49 +33 26.3 4.087 4.443 104.6 12.5 19.5
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2019 CBAT
2019 December 10 (CBET 4702) Daniel W. E. Green
More information about the Iaude
mailing list