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Comet C/2017 B3 (LINEAR)

Photometric data obtained from FOCAS-II software

COD B96

CON BRIXIIS Observatory - Eyckensbeekstraat 2, B-9150 Kruibeke, Belgium

CATALOG: USNO A2.0 / CMC 14-15 - BAND: R

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  -------------------  -----  -----  -----  -----  -----  -----  ----  ----  ---

C/2017 B3     05/02/2017 15:49:55  18.68  18.48  18.56                        9.9  20.9  Q62

C/2017 B3     05/02/2017 15:49:55*  0.13   0.22   0.22                          8   3.0  CMC

C/2017 B3     31/07/2020 01:10:13  16.91  16.29  16.06  16.14                 6.9  17.7  B96

C/2017 B3     31/07/2020 01:10:13*  0.04   0.02   0.00   0.05                   2   3.8  Gai

C/2017 B3     13/09/2020 23:11:06  16.70  16.00  15.64  15.53  15.46  15.48  12.9  17.8  B96

C/2017 B3     13/09/2020 23:11:06*  0.02   0.01   0.08   0.06   0.03   0.09     2   3.5  Gai

C/2017 B3     18/09/2020 23:58:40  16.69  16.09  15.87  15.78  15.82          8.7  17.7  B96

C/2017 B3     18/09/2020 23:58:40*  0.01   0.00   0.03   0.05   0.07            2   3.9  Gai

C/2017 B3     20/09/2020 23:24:46  16.60  15.94  15.64  15.55  15.50  15.46  11.8  17.9  B96

C/2017 B3     20/09/2020 23:24:46*  0.05   0.08   0.07   0.03   0.02   0.05     2   3.8  Gai

C/2017 B3     02/11/2020 20:34:52  16.93  16.28  15.94  15.95  16.04          9.8  17.1  B96

C/2017 B3     02/11/2020 20:34:52*  0.10   0.06   0.05   0.01   0.10            2   3.6  Gai

C/2017 B3     04/11/2020 21:45:10  17.35  16.51  16.10  16.01  16.09  16.18   4.1  17.4  B96

C/2017 B3     04/11/2020 21:45:10*  0.09   0.14   0.16   0.12   0.29   0.27     3   3.7  Gai

C/2017 B3     06/11/2020 21:52:29  17.21  16.48  16.07  15.94  15.85  15.80   7.9  17.8  B96

C/2017 B3     06/11/2020 21:52:29*  0.03   0.03   0.02   0.00   0.00   0.03     2   3.8  Gai

C/2017 B3     12/11/2020 23:00:02  17.30  16.49  16.17  16.04                 3.0  17.2  B96

C/2017 B3     12/11/2020 23:00:02*  0.25   0.17   0.22   0.30                   3   3.8  Gai

C/2017 B3     04/10/2021 21:18:19  18.99  18.70  18.60  18.61                 5.0  18.2  B96

C/2017 B3     04/10/2021 21:18:19*  0.26   0.13   0.38   0.43                   3   3.5  Gai

                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

C/2017 B3     05/02/2017 15:49:55    6.60   7.05   4.18  18.76   10    651    66  2.814  Q62

C/2017 B3     31/07/2020 01:10:13    5.42   5.99   5.08  17.23    7   1295   188  3.112  B96

C/2017 B3     13/09/2020 23:11:06    5.27   6.25   5.24  17.03   13   1609   125  3.207  B96

C/2017 B3     18/09/2020 23:58:40    5.28   6.28   5.22  16.96    9   1739   200  3.240  B96

C/2017 B3     20/09/2020 23:24:46    5.29   6.29   5.21  16.89   12   1862   158  3.270  B96

C/2017 B3     02/11/2020 20:34:52    5.78   6.55   4.77  17.25   10   1742   178  3.241  B96

C/2017 B3     04/11/2020 21:45:10    5.82   6.56   4.74  17.64    4   1228   300  3.089  B96

C/2017 B3     06/11/2020 21:52:29    5.85   6.57   4.71  17.70    8   1181   150  3.072  B96

C/2017 B3     12/11/2020 23:00:02    5.97   6.61   4.62  17.96    3    983   328  2.993  B96

C/2017 B3     04/10/2021 21:18:19    7.65   8.60   3.61  19.25    5    830   166  2.919  B96

Af(rho) data according the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

Discovery:

An apparently asteroidal object found on CCD images obtained with the 3.5-m f/1 Space Surveillance Telescope on Atom Peak in the White Sands Missile Range, NM, USA, in the course of the LINEAR survey has been found to show cometary appearance by CCD astrometrists elsewhere after the object was posted on the Minor Planet Center's NEOCP and PCCP webpages

S. Foglia writes (on behalf also of L. Buzzi, P. Concari, C. Cremaschini, G. Galli, and M. Tombelli) that ten stacked images taken on Jan. 28.6 UT with an iTelescope 0.15-m f/7 refractor at Siding Spring reveal a round, compact coma 6" in diameter (FWHM being 30 percent larger than images of nearby stars) with red magnitude 18.2-18.4; twelve stacked follow-up images taken on Jan. 30.7 show a coma of size 6" x 10", elongated toward p.a. 300 (red mag 18.8- 18.9).  K. Sarneczky, Konkoly Observatory, report that twelve stacked 120-s unfiltered CCD images taken with the 0.60-m Schmidt telescope at Piszkesteto, Hungary, on Jan. 28.1 show a condensed, slightly fuzzy coma that is "softer" than the nearby stars; the R-band magnitude was 18.7 as measured within a circular aperture of radius 5".0.  G-band images taken by W. H. Ryan and E. V. Ryan on Jan. 30.44-30.46 with the Magdalena Ridge Observatory 2.4-m f/8.9 reflector show a distinct coma and a small tail toward p.a. about 325 deg. H. Sato, Tokyo, Japan, writes that ten stacked images taken with a 0.61-m

f/6.5 astrograph (+ luminance filter) at the Sierra Remote Observatory, Auberry, CA, USA, on Jan. 31.5 show a strongly condensed coma 8" in diameter with no tail, and  w-band magnitude 18.4 as measured within a circular aperture of radius 5".0.