Bright (mag 6) nova in Perseus

Here's the place for any sights you wish to remark on

Moderators: joe, Brian, Guy Fennimore

Post Reply
Tracie Heywood
Posts: 21
Joined: Sat Sep 24, 2016 10:16 pm
Contact:

Bright (mag 6) nova in Perseus

Post by Tracie Heywood »

A mag 6 nova was discovered in Perseus yesterday by Japanese observer Yuji Nakamura.

The position of the nova (RA 04 43 21.38, Dec +47 21 25.9) coincides exactly with that of another variable star V392 Persei, which was already known to produce small dwarf-nova type outbursts (the most recent of which only reached mag 14). This is somewhat reminiscent of another nova GK Persei. However GK Persei was first observed as a bright (mag 0) nova in 1901 and has since produced a number of smaller dwarf nova type outbursts to around mag 10, these becoming more frequent in recent decades.

Somewhat inconveniently, Perseus is rather low in the NNW sky at the start of the night at this time of the year.

The nova is located roughly midway between Capella and the main stars of Perseus. Robin Scagell is currently working on a newsletter that will be sent out to SPA members and will include a finder chart for the nova.
RMSteele
Posts: 570
Joined: Thu Jun 02, 2016 11:32 am
Location: New Farnley, Leeds lat 53.8N long 1.6W
Contact:

Re: Bright (mag 6) nova in Perseus

Post by RMSteele »

2018 April 30, 21.42 UT. 15x63 binoculars. Rather difficult to identify without an actual field chart for the variable, but IF I HAVE CORRECTLY IDENTIFIED IT, it appears to be fading already and my estimate is mag 7.2 - can anyone else confirm?
Regards, Bob
Tracie Heywood
Posts: 21
Joined: Sat Sep 24, 2016 10:16 pm
Contact:

Re: Bright (mag 6) nova in Perseus

Post by Tracie Heywood »

It is fading ... estimated at mag 7.3 at 22:05 UT tonight (70-3 on the AAVSO chart).

You can download a chart for V392 Per from the AAVSO website
https://www.aavso.org/apps/vsp/

This , by default, plots a narrow field chart with a LM of 14.5, but if you use the following link, you'll get a wider field chart with a LM of 9.0

https://www.aavso.org/apps/vsp/chart/?f ... type=chart
AndyF
Posts: 16
Joined: Wed Aug 03, 2011 11:19 am
Location: West Garforth, Leeds
Contact:

Re: Bright (mag 6) nova in Perseus

Post by AndyF »

Hi Bob,
2018-04-03 : 22:55UT : 15x70 binoculars
Good clear sky to the NW. Using the finder charts & RA & Dec info provided by Robin Scagell I was confident that I was looking in the right area of the sky. I did struggle to identify the nova, I was expecting it to be brighter than it was. I noted it at mag 7.0.
Regards
Andy
RMSteele
Posts: 570
Joined: Thu Jun 02, 2016 11:32 am
Location: New Farnley, Leeds lat 53.8N long 1.6W
Contact:

Re: Bright (mag 6) nova in Perseus

Post by RMSteele »

Hello Andy, Using the link to the mag 9 AAVSO chart that Tracie provides, I can now say that I correctly identified the nova last night and that I probably used the same mag 7.0 comparison star as Tracie to make my estimate (70-2). To my eyes the nova forms the lower right apex of an isosceles triangle of mag 7 - 8 stars. Given clear skies I wonder if we can continue to follow it.
Identifying newly discovered novae that only get to around mag 6-7 can be tricky. They fade so quickly. We are lucky to have a known dwarf nova here and a chart. I had difficulty last January with Nova Muscae 2018 and it was already down to around mag 7.5 when I picked it up in 8x40s on the 18th.
Best of luck and kind thoughts, Bob
AndyF
Posts: 16
Joined: Wed Aug 03, 2011 11:19 am
Location: West Garforth, Leeds
Contact:

Re: Bright (mag 6) nova in Perseus

Post by AndyF »

Hi Bob,
I've just printed off the AAVSO chart and compared it to my sketch I made last night and the position of the nova tallies on the sketch and chart. I'm quite pleased with this, as I spend most of the time with the moon & planets. Looking back this is the first nova I've ever looked at
Cliff's image also seems to show what I was seeing.
It would be nice if we had a few more clear nights to follow its progress.
Best Regards
Andy
Paul Sutherland
Site Admin
Posts: 917
Joined: Sat Jul 24, 2004 6:06 pm
Location: Walmer, Kent
Contact:

Re: Bright (mag 6) nova in Perseus

Post by Paul Sutherland »

I imaged the nova last night. It appears to be below magnitude 7 now. The session was enlivened by a lovely slow fireball that dropped below Polaris at around 20.10 UT and looked of similar brightness to Venus.

Image
David Frydman
Posts: 5361
Joined: Mon Jan 18, 2010 9:25 am
Contact:

Re: Bright (mag 6) nova in Perseus

Post by David Frydman »

Hi Paul,
I get an empty page with a No Entry sign?

Regards,
David
RMSteele
Posts: 570
Joined: Thu Jun 02, 2016 11:32 am
Location: New Farnley, Leeds lat 53.8N long 1.6W
Contact:

Re: Bright (mag 6) nova in Perseus

Post by RMSteele »

2018 May 02, 21.58 UT. 80mm f5 refractor x27. Sky transparency fair. Artificial illumination seriously affected the field and made observation difficult. Estimate 90+5 (reliability 3) and 87+3 (reliability 2). Deduced magnitude of nova = 8.4.
Anyone else managed to make an estimate tonight?
Kind Regards, Bob
edited to correct first draft which said "90-5" which should of course be "90+5"
Last edited by RMSteele on Wed May 02, 2018 10:30 pm, edited 2 times in total.
Tracie Heywood
Posts: 21
Joined: Sat Sep 24, 2016 10:16 pm
Contact:

Re: Bright (mag 6) nova in Perseus

Post by Tracie Heywood »

Managed to make an estimate using the AAVSO chart just before the cloud rolled in

21:41 UT V392 Per = 79-5, 86+3 Deduced mag 8.4 (11x80B) class 2 (averted vision for 86 comp)
Post Reply