Fwd: [CometObs] Digest Number 3301

Comet Observations Group

3 Messages

Digest #3301

1

C/2015 ER61, C/2015 VL62, C/2017 O1. by "Juan Jose Gonzalez" jjgsgp

2

C/2015 VL62 ( Correction to previous mail on VL62 name ). by "Juan Jose Gonzalez" jjgsgp

3a

Observations Aug 13 - Aug 17 by "Thomas Lehmann" ewelot

Messages

1

C/2015 ER61, C/2015 VL62, C/2017 O1.

Fri Aug 18, 2017 7:12 am (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

C/2015 ER61 (PANSTARRS):
2017 Aug. 17.02 UT: m1=10.2, Dia.=3.5', DC=2/, 20 cm SCT (77x).
[ Before moonrise. Altitude: 17 deg. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.1.].

C/2015 V2 (Lemmon-Yeung-PANSTARRS):
2017 Aug. 16.94 UT: m1=12.3, Dia.=1.5', DC=3/, 20 cm SCT (133x).
[ Motion checked over a 20-min period. Field stars checked in DSS.
Sidgwick method. APASS comparison stars. SQM : 21.2.].

C/2017 O1 :
2017 Aug. 17.03 UT: m1=9.1, Dia.=5', DC=3/, 20 cm SCT (77x).
[ Before moonrise. Altitude: 11 deg. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.0.].

( Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W;
Mountain location, very clear sky.)

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ICQ Format :

2015ER612017 08 17.02 S 10.2 TK 20.3T10 77 3.5 2/ ICQ XX
GON05

2015VL622017 08 16.94 S 12.3 AQ 20.3T10 133 1.5 3/ ICQ XX GON05

2017O1 2017 08 17.03 S 9.1 TK 20.3T10 77 5 3/ ICQ XX
GON05

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J. J. Gonzalez

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2

C/2015 VL62 ( Correction to previous mail on VL62 name ).

Fri Aug 18, 2017 7:47 am (PDT) . Posted by:

"Juan Jose Gonzalez" jjgsgp

It should read :

C/2015 VL62 (Lemmon-Yeung-PANSTARRS):
2017 Aug. 16.94 UT: m1=12.3, Dia.=1.5', DC=3/, 20 cm SCT (133x).
[ Motion checked over a 20-min period. Field stars checked in DSS.
Sidgwick method. APASS comparison stars. SQM : 21.2.].

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3a

Observations Aug 13 - Aug 17

Fri Aug 18, 2017 11:29 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

2015V2 2017 08 15.38 C 9.4 TK 10.6R 5a480 20 0.3 6 LEHaa 18.5 CCD/G remote (SSO)

2016M1 2017 08 13.91 C 15.2 AQ 20.0L 4G080 1.0 LEHaa 20.7 DSLR green
2016M1 2017 08 14.15 C 15.3 AQ 51.0L 4a360 0.8 LEHaa 19.6 CCD/G remote (Mayhill)

2016N6 2017 08 13.14 C 16.1 AQ 51.0L 4a600 0.5 LEHaa 19.5 CCD/G remote (Mayhill)

2016R2 2017 08 13.79 C 13.9 AQ 40.0L 4a600 2.5 LEHaa 20.0 CCD/G remote (SSO), moon 64% dist 46deg

2017O1 2017 08 17.46 C 9.3 TK 10.6R 5a600 18 LEHaa 18.7 CCD/G remote (Mayhill), moon 24% dist 40deg

41 2017 08 13.15 C 16.2:TK 10.6R 5a840 1.4 LEHaa 18.8 CCD/G remote (Mayhill)

71 2017 08 13.37 C 10.2 AQ 40.0L 4a480 14.3 LEHaa 20.7 CCD/G remote (SSO)

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