Jump to content

Walking on the Moon

21P/Giacobini-Zinner grows a tail


Recommended Posts

I'm finding it difficult to estimate the brightness of this comet... on a single DSLR frame it looks around mag 7.5 but through 20 x 80 binos it's big and nebulous and at least a magnitude brighter. It does seem on course to meet expectations.

Link to comment
Share on other sites

15 minutes ago, goodricke1 said:

I'm finding it difficult to estimate the brightness of this comet... on a single DSLR frame it looks around mag 7.5 but through 20 x 80 binos it's big and nebulous and at least a magnitude brighter. It does seem on course to meet expectations.

Been observing it for a while during the recent spell of good weather, not something I've been able to do on previous comets and the brightness seemed to vary up and down from one night to the other.

Dave

  • Like 1
Link to comment
Share on other sites

Spotted 21/P Giacobini-Zinner this morning  at 01.30 CEST with the 5.1" Heritage Flextube. NELM 5.0, so slightly sub-average. Using the 26mmf/62° ES LER, I found the comet, starhopping from Epsilon Cas, within five minutes, SkySafari showing the accurate position. The magnitude of the 4 arc min coma was about 8.3 mag (using the Sidgwick method with HD 7443 and HD 7757 as comparison stars). DC (= degree of condensation)  about 5. Using the Seben zoom set to 8mmf, giving 81x mag, a small, but distinct stellar nucleus ("false nucleus") could easily be made out. There was a very faint hint of a short, broad tail visible, extending for about 8 - 10 arc min to SW. A nice comet, promising for the next weeks. - On the way back, I stumbled over the small open cluster NGC 637. The "Heart and Soul" nebula formation was, despite the use of a Baader UHC filter, almost invisible.

Stephan

Edited by Nyctimene
  • Like 5
Link to comment
Share on other sites

Just been observing this one with my Tak FC100. Looks around mag 7.5 or so I'd say. Definately elongated and averted vision does suggest a tail of sorts. Easy to find tonight :smiley:

 

  • Like 3
Link to comment
Share on other sites

Spotted it with the 130P tonight, very easy to see, but shape more difficult, I thought it looked slightly fan shaped with the nucleus more towards the 'hinge' of the fan, but the images don't seem to look like this, so probably more my imagination! Nice to see it though.

  • Like 3
Link to comment
Share on other sites

A good view last night with the Dob. Very clear with the 14" aperture even before the skies were truly dark. Couldn't really see a tail as such more an elongated core stretched out in one direction. A sort of stubby tail? Watched it for over an hour which was long enough to detect movement against the background stars. I was pleased to find it without the help of goto although it did take a while! Must fit the Telrad back onto the Dob ?

  • Like 3
Link to comment
Share on other sites

Spotted 21/P G.-Z. this morning at 01.45 CEST with the Heritage 130 P; NELM 5.0. Easy to see at 25x mag; the brightness seems not to have increased during the last two nights; still about 8.3 to 8.5 mag. (compared to HD 10152 with 8.3 mag). Coma diameter about 4 arc min; the broad, fan-like tail was more apparent than before, similar to Rob's impression, and could be made out with direct vision (better, of course, with averted vision) The nucleus was a tad dimmer, IMO. With 7x50 binos, the comet was just visible. Let's  hope and continue..

Btw: during about 45 min observing time, I didn't spot a single Perseid meteor (partly due to a restricted field of view, but still strange) - just two days before the maximum - your experiences?

Stephan

Edited by Nyctimene
  • Like 4
Link to comment
Share on other sites

1 hour ago, Nyctimene said:

Btw: during about 45 min observing time, I didn't spot a single Perseid meteor (partly due to a restricted field of view, but still strange) - just two days before the maximum - your experiences?

Had the DSLR set up with 24mm lens aimed at Pegasus region, snapping away while I was comet hunting, only caught 2 dim specimens in 2 hours, saw a nice bright one overhead as I was packing up.

Dave

  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.