Fwd: [CometObs] Digest Number 3306

Comet Observations Group

2 Messages

Digest #3306

1

Observations Aug 14 - Aug 24 by "Thomas Lehmann" ewelot

2

29P in outburst, C/2015 ER61, C/2017 O1. by "Juan Jose Gonzalez" jjgsgp

Messages

1

Observations Aug 14 - Aug 24

Sat Aug 26, 2017 12:11 am (PDT) . Posted by:

"Thomas Lehmann" ewelot

Please find enclosed a list of my recent comet observations in ICQ format.
Magnitudes are derived from large aperture photometry of CCD/DSLR images
(using green filter or green color channel) and are supposed to conform
to visual estimates of total coma magnitudes.

Remote observations were carried out using telescopes from iTelescope.net.
For image reduction and photometric analysis I used my AIRTOOLS software
(see https://github.com/ewelot/airtools).

Thomas Lehmann
Weimar, Germany

2015ER612017 08 23.80 C 11.5 AQ 40.0L 4a600 9 0.46 267 LEHaa 20.4 CCD/G remote (SSO)

2015V2 2017 08 23.39 C 9.6 TK 10.6R 5a600 15 LEHaa 17.6 CCD/G remote (SSO)

2016M1 2017 08 14.84 C 15.4 AQ 20.0L 4A320 0.7 LEHaa 19.1 DSLR green

2016R2 2017 08 22.80 C 14.4 AQ 40.0L 4a720 2.1 0.04 246 LEHaa 20.4 CCD/G remote (SSO)

2 2017 08 17.58 C 17.7 AQ 40.0L 4a600 1 LEHaa 20.6 CCD/G remote (SSO), dust trail total length 2' at pa=253 ##'

71 2017 08 24.39 C 13.0 TK 10.6R 5a600 2.6 LEHaa 18.4 CCD/G remote (SSO), in field of dense milky way clouds

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2

29P in outburst, C/2015 ER61, C/2017 O1.

Sat Aug 26, 2017 4:35 am (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

29P/Schwassmann-Wachmann:
2017 Aug. 25.00 UT: m1=12.5, Dia.=0.7', DC=6, 20 cm SCT (133x).
[ In outburst. Starlike central condensation : m2=13.7 (APASS).
Brighter inner coma diameter : 0.7', providing m=12.5 (APASS).
Faint and diffuse outer coma diameter : 3', providing m=10.5: (Tycho-2).
( This faint 3' outer coma, remnant of previous outbursts, was also
observed in pre-outburst dates : Aug. 16.91 and 20.92 UT ).
Sidgwick method. Field stars checked in DSS. Altitude: 33 deg. SQM : 21.4.].

C/2015 ER61 (PANSTARRS):
2017 Aug. 25.17 UT: m1=10.6, Dia.=3', DC=2, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.3.].

C/2017 O1 (ASASSN):
2017 Aug. 25.15 UT: m1=8.7, Dia.=8', DC=3, 25x100B.
[ In 20 cm SCT (77x) : m1=9.0, Dia.=6', DC=3.
Sidgwick method. Tycho-2 comparison stars. SQM : 21.4.].

( Puerto del Pando - Prioro, Leon, Spain; Alt. 1430 m, 42º 56' N, 4º 57' W;
Mountain location, clear sky. SQM 21.5 at zenith.).

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ICQ Format :

29 2017 08 25.00 S 12.5 AQ 20.3T10 133 0.7 6 ICQ
XX GON05

2015ER612017 08 25.17 S 10.6 TK 20.3T10 100 3 2 ICQ XX GON05

2017O1 2017 08 25.14 S 9.0 TK 20.3T10 77 6 3 ICQ XX GON05

2017O1 2017 08 25.15 S 8.7 TK 10.0B 25 8 3 ICQ XX GON05

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J. J. Gonzalez

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