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CG Dra: a VSS campaign

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Jeremy's picture
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CG Dra: a VSS campaign

I've just posted an article about observing this dwarf nova. This is a star that is always doing something. It has outbursts every 11 days or so, and yet has been neglected of late.

It's also a good target for those wanting to have a go at digital photometry. For several years I used a 10 cm refactor and CCD to follow this object. And you don't need to use a filter. Perhaps you can fit in a few 60 sec exposures among your other imaging projects.

Visual obs also welcome, although at it's brightest it's 15th mag, so a large telescope will be needed.

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Many thanks for the article,

Many thanks for the article, Jeremy. I've scheduled a few instruments in Spain and New Mexico, so hopefully will have some data to chew on.

Jeremy's picture
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That's super, Maxim. Good

That's super, Maxim. Good luck!

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Outburst

CG Dra has been slowly rising to outburst over the past couple of nights...

May 10.06UT  17.06CV

May 12.01UT  16.88CV

May 12.98UT  16.15CV

May 13.95UT  15.90CV

Uisng both the OU COAST and SLOOH 2

Gary

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Alas, poor weather at my all

Alas, poor weather at my all locations. Runs cancelled one after another. Was only able to get this today on 0.5 m in New Mexico:

CG Dra, 2021-05-16 07:04:57.000 UTC, V = 16.33 ± 0.11

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Looks like it's on the fade

Looks like it's on the fade after the peak on the 13th/14th - back at about 16.7CV early this morning (17-May-21 03:18-03:56UT).

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Got a good session on May

Got a good session on May 17th. First observation 06:02, last 09:04 UTC. I wonder, is this a ~ 0.2 mag flickering or irregular modulations or this is actually an eclipse? In case of the latter then why the exit follows by an irregular tail - clumpy accretion disk?

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Jeremy's picture
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Good to see your photometry

Good to see your photometry run, Maxim. Thank you!

My first reaction, like yours, is it's probably flickering. But time will tell.

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Some results from iTEL 24

16.9 V mag on the early morning 20th May. Data is at AAVSO site. Stewart

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A few more observations -

A few more observations - moonlit sky.

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CG Dra, 2021-05-29 09:17:01

CG Dra, 2021-05-29 09:17:01.000 UTC, V = 16.71 ± 0.091

Difficult to get any good accuracy due to the Moon now.

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Outburst

It appears that the slightly overdue outburst of CG Dra has finally started...

June 16.895 UT  15.87CV  (SLOOH)

Gary