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| Images taken in the course of CSP in C42 when the system was conducting the comet search mode. |
CBET 3649 announces a new discovery of a comet designated C/2013 R1 (Lovejoy) by Terry Lovejoy on his CCD images first taken on 2013 Sept 07.69 UT through a 0.2-m f/2.1 Schmidt-Cassegrain. He followed up the object of mag ~14 the second night and then reported his finding. MPEC 2013-R72 gives a parabolic solution to the newly-discovered comet, according to which, the observing conditions is turning better and better for the northern hemisphere observers. It is likely to turn into a decen comet in this November, given the current activity trend.
2013/09/09 2013/09/11 2013/10/08 2013/11/06 2013/12/25
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| Images taken in the course of CSP in C42 when the system was conducting the comet search mode. |
MPC observation computed with Astrometrica using NOMAD star catalogs:
COD C42
CON M.-T. Hui, Wuhan University, China
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.11-m f/5.0 refractor + CCD
NET NOMAD
CK13R010 C2013 09 09.87869 06 01 27.17 -06 25 49.8 14.1 N C42
CK13R010 C2013 09 09.89063 06 01 28.08 -06 25 44.3 13.7 N C42
CK13R010 C2013 09 09.90384 06 01 29.38 -06 25 40.2 14.2 N C42
I stacked the image sequence and measured the Afrho values in Wafrho. Totally 5 comparison stars with color indexes similar to the sun's in catalog UCAC-4 were used.
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Since V band can transmit contain gas emission lines, the Af[rho] values may well be boosted to some extent.
I applied APER.pro for measuring the brightness of the comet on the image with registration on the cometary motion. A series of apertures were centered on the optocenter which was solved by CNTRD.pro and yielded the multiaperture photometry.
Program: APER:
Radius of aperture 0 = 1.7
Radius of aperture 1 = 3.3
Radius of aperture 2 = 5.0
Radius of aperture 3 = 6.7
Radius of aperture 4 = 8.3
Radius of aperture 5 = 10.0
Radius of aperture 6 = 11.7
Radius of aperture 7 = 13.3
Radius of aperture 8 = 15.0
Radius of aperture 9 = 16.7
Radius of aperture 10 = 18.3
Radius of aperture 11 = 20.0
Inner radius for sky annulus = 30.0
Outer radius for sky annulus = 50.0
Sky SkySig SkySkw Magnitudes
272.98 6.65 0.14 15.253+-0.093 14.204+-0.082 13.683+-0.079 13.305+-0.077 13.015+-0.076 12.806+-0.076
12.668+-0.076 12.555+-0.077 12.455+-0.077 12.374+-0.077 12.274+-0.077 12.205+-0.078
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Copyright © Man-To Hui 2013/09/11
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| The coma appears rather diffuse and enormous. Images were stacked in median so as to smear out the field stars. |
MPC observation computed with Astrometrica using UCAC-4 and NOMAD star catalogs, the former for astrometry and the latter for photometry:
COD C42
OBS M.-T. Hui, X. Gao
MEA M.-T. Hui
TEL 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET UCAC-4
CK13R010 KC2013 09 11.86753 06 04 29.04 -06 13 03.8 14.9 N C42
CK13R010 KC2013 09 11.87140 06 04 29.32 -06 13 02.9 14.8 N C42
CK13R010 KC2013 09 11.87529 06 04 29.63 -06 13 01.4 14.8 N C42
CK13R010 KC2013 09 11.87916 06 04 30.09 -06 12 59.3 14.9 N C42
CK13R010 KC2013 09 11.88303 06 04 30.48 -06 12 58.3 14.8 N C42
CK13R010 KC2013 09 11.88691 06 04 30.76 -06 12 56.4 14.8 N C42
CK13R010 KC2013 09 11.89079 06 04 31.20 -06 12 55.7 14.8 N C42
CK13R010 KC2013 09 11.89468 06 04 31.46 -06 12 54.1 14.8 N C42
CK13R010 KC2013 09 11.92582 06 04 34.35 -06 12 41.2 14.8 N C42
I stacked the image sequence and measured the Afrho values in Wafrho. 3 comparison stars with color indexes similar to the sun's in catalog UCAC-4 were used.
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I applied APER.pro for measuring the brightness of the comet on the image with registration on the cometary motion. 6 stars similar to the sun's color index were taken from the NOMAD and the zeropoint of the image was calculated. A series of apertures were centered on the optocenter which was solved by CNTRD.pro and yielded the multiaperture photometry. The uncertainty mainly comes from the residuals of the zeropoint calculations.
Radius of aperture 0 = 9.0
Radius of aperture 1 = 18.0
Radius of aperture 2 = 27.0
Radius of aperture 3 = 36.0
Radius of aperture 4 = 45.0
Radius of aperture 5 = 54.0
Radius of aperture 6 = 63.0
Radius of aperture 7 = 72.0
Radius of aperture 8 = 81.0
Radius of aperture 9 = 90.0
Radius of aperture 10 = 99.0
Radius of aperture 11 = 108.
Inner radius for sky annulus = 180.
Outer radius for sky annulus = 300.
Star X Y Sky SkySig SkySkw Magnitudes
0 593.14 544.55 847.92 9.86 0.04 14.710+-0.132 13.976+-0.132 13.567+-0.132 13.282+-0.132 13.070+-0.132 12.898+-0.132
12.749+-0.132 12.621+-0.132 12.515+-0.132 12.426+-0.132 12.344+-0.132 12.262+-0.132
ZP = 27.5607+-0.131518
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Copyright © Man-To Hui 2013/09/15
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| The coma appears rather diffuse and enormous. |
MPC observation computed with Astrometrica using NOMAD star catalog:
COD C42
CON M.-T. Hui
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.11-m f/5.0 refractor + CCD
NET NOMAD
CK13R010 KC2013 10 08.88647 06 51 42.06 -01 35 27.4 13.0 N C42
CK13R010 KC2013 10 08.89862 06 51 43.59 -01 35 15.2 13.0 N C42
CK13R010 KC2013 10 08.91010 06 51 45.09 -01 35 03.7 12.9 N C42
CK13R010 KC2013 10 08.92230 06 51 46.53 -01 34 51.4 12.8 N C42
I stacked the image sequence and measured the Afrho values.
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I applied APER.pro for measuring the brightness of the comet on the image with registration on the cometary motion. 14 stars similar to the sun's color index were taken from the NOMAD and the zeropoint of the image was calculated. A series of apertures were centered on the optocenter which was solved by CNTRD.pro and yielded the multiaperture photometry. The uncertainty mainly comes from the residuals of the zeropoint calculations. The aperture size is in pixels.
ZP = 23.1391+-0.0689833
aper mag emag
3.0 12.996+-0.070
6.0 12.096+-0.069
9.0 11.592+-0.069
12.0 11.236+-0.069
15.0 10.960+-0.069
18.0 10.735+-0.069
21.0 10.541+-0.069
24.0 10.377+-0.069
27.0 10.244+-0.069
30.0 10.129+-0.069
33.0 10.029+-0.069
36.0 9.935+-0.069
39.0 9.846+-0.069
42.0 9.772+-0.069
45.0 9.708+-0.069
48.0 9.650+-0.069
51.0 9.598+-0.069
54.0 9.549+-0.069
57.0 9.505+-0.069
60.0 9.463+-0.069
63.0 9.421+-0.069
66.0 9.379+-0.069
69.0 9.337+-0.069
72.0 9.296+-0.069
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Copyright © Man-To Hui 2013/11/12
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| Coma size, 18'.9 in diameter, tail: >2.9 deg. in P.A. 277 deg. The tail appears so long that the FOV failed to cover the length completely. Image scale: 4.97"/pixel, rotation: -76.94 deg. |
MPC observation computed with Astrometrica using NOMAD star catalog:
COD XXX
COM Long. 113 24 50.4 E, Lat. 23 12 47.5 N, Alt. 49m
CON M.-T. Hui
OBS M.-T. Hui
MEA M.-T. Hui
TEL 0.08-m f/5.6 refractor + CCD
NET NOMAD
CK13R010 KC2013 11 06.73969 08 40 35.91 +17 58 03.5 9.6 N XXX
CK13R010 KC2013 11 06.75167 08 40 41.34 +17 59 04.8 9.6 N XXX
CK13R010 KC2013 11 06.76334 08 40 46.65 +18 00 04.8 9.5 N XXX
CK13R010 KC2013 11 06.77470 08 40 51.77 +18 01 03.3 9.6 N XXX
CK13R010 KC2013 11 06.78612 08 40 56.96 +18 02 02.0 9.6 N XXX
CK13R010 KC2013 11 06.79737 08 41 02.07 +18 03 00.0 9.7 N XXX
CK13R010 KC2013 11 06.81042 08 41 08.00 +18 04 07.1 9.5 N XXX
CK13R010 KC2013 11 06.81421 08 41 09.71 +18 04 27.9 10.0 N XXX
CK13R010 KC2013 11 06.82148 08 41 13.02 +18 05 03.9 9.7 N XXX
CK13R010 KC2013 11 06.83280 08 41 18.16 +18 06 02.0 9.6 N XXX
CK13R010 KC2013 11 06.84802 08 41 25.07 +18 07 20.1 9.7 N XXX
CK13R010 KC2013 11 06.86120 08 41 31.07 +18 08 27.9 9.6 N XXX
CK13R010 KC2013 11 06.87446 08 41 37.09 +18 09 36.3 9.7 N XXX
CK13R010 KC2013 11 06.88906 08 41 43.71 +18 10 51.5 9.7 N XXX
I did not perform any photometric measurements with the observations.
Copyright © Man-To Hui 2013/11/12
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| The image in the center was 0.5x resized. |
MPC observation computed with Astrometrica using NOMAD star catalog:
COD C42
OBS X.Gao, M.-T. Hui
MEA M.-T. Hui
TEL 0.36-m f/6.9 Schmidt-Cassegrain + CCD
NET NOMAD
CK13R010 KC2013 12 25.97209 17 14 56.20 +23 25 45.0 9.7 N C42
CK13R010 KC2013 12 25.97450 17 14 56.52 +23 25 40.4 9.8 N C42
CK13R010 KC2013 12 25.97663 17 14 56.85 +23 25 36.2 9.8 N C42
CK13R010 KC2013 12 25.97877 17 14 57.13 +23 25 32.0 9.8 N C42
CK13R010 KC2013 12 25.98092 17 14 57.48 +23 25 27.3 9.8 N C42
I did not perform any photometric measurements due to lacking appropriate comparison stars in the FOV.
Copyright © Man-To Hui 2013/12/26
Feel free to e-mail me with any doubts or questions.
