Fwd: [CometObs] Digest Number 3265

Comet Observations Group

2 Messages

Digest #3265

1

OBS-V: C/2015 V2 (Johnson) by scholten0dcs

2

C/2015 ER61, C/2015 V2, 41P, 71P. by "Juan José González Suárez" jjgsgp

Messages

1

OBS-V: C/2015 V2 (Johnson)

Fri May 26, 2017 6:22 am (PDT) . Posted by:

scholten0dcs

2017 05 25.96 m = 7.3 (coma 18' DC=7) in 8x56B
Eerbeek (Netherlands)
Alex Scholten

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2

C/2015 ER61, C/2015 V2, 41P, 71P.

Fri May 26, 2017 1:45 pm (PDT) . Posted by:

"Juan José González Suárez" jjgsgp

C/2015 ER61 (PANSTARRS):
2017 May 24.12 UT: m1=7.9, Dia.=4', DC=5, 25x100B.
[ In 20 cm SCT(77x): tail 0.4-deg in PA 260 deg.
Beginning of astronomical twilight. Sidgwick method.
Tycho-2 comparison stars. Altitude: 9 deg. SQM : 20.8.
Mountain location, very clear sky.].

C/2015 V2 (Johnson ):
2017 May 24.01 UT: m1=7.1, Dia.=15', DC=4/,
Tail: 0.5 deg. in PA 320 deg, 12x45 monocular.
[ The comet shows a much wider coma diameter, providing
a brighter m1 estimate in comparison with my previous
May 3.12 observation; there is also a lesser influence of
the inner dust tail on the magnitude estimate. Sidgwick method.
Tycho-2 comparison stars. SQM : 21.5 at zenith.].

41P/Tuttle-Giacobini-Kresak:
2017 May 24.09 UT: m1=7.8, Dia.=9', DC=2, 8 cm R (20x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.5 at zenith.].

71P/Clark:
2017 May 24.02 UT: m1=11.2, Dia.=2.2', DC=3/, 20 cm SCT (100x).
[ Sidgwick method. Tycho-2 comparison stars. SQM : 21.2.].

( Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54' N, 5º 48' W ).

---------------------------------------------------
ICQ Format :

2015ER612017 05 24.12 S 7.9 TK 10.0B 25 4 5 ICQ
XX GON05

2015V2 2017 05 24.01 S 7.1 TK 4.5R 12 15 4/ 0.5 320 ICQ
XX GON05

41 2017 05 24.09 S 7.8 TK 8.0R 20 9 2 ICQ
XX GON05

71 2017 05 24.02 S 11.2 TK 20.3T10 100 2.2 3/ ICQ
XX GON05
---------------------------------------------------

J. J. Gonzalez

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