Nova in Cassiopeia

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RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

Hello Jeff, had a look at the blog, but the light curve only goes up to the beginning of Sept and as of 28 Aug the nova was still around mag 8.0 according to my notes. We really need a cloud break to see where it's at now. You've also got to be careful with light curves like this because the different symbols imply a mixture of different types of observations, visual, B-V, and estimates derived from Imaging - they give systematically different values. Good luck, Bob
Last edited by RMSteele on Sun Sep 12, 2021 10:55 am, edited 1 time in total.
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

Thanks Bob, I was trying to work out what the symbols were, as I couldn't see a key. Yes, at the next opportunity I'll take a peek. It will be interesting to see where it is at.

Best wishes, Jeff.
SkyBrowser
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Re: Nova in Cassiopeia

Post by SkyBrowser »

The graph is a copy of the one AVVSO will generate for you. Try this link -

https://www.aavso.org/LCGv2/

Use V1405 Cas for the star name, turn off "all bands" and then select "Vis", set the Plot field to 200 and tick the Days box. Then press send. You should get something like this -

AAVSO light curve.jpg
AAVSO light curve.jpg (174.08 KiB) Viewed 182 times

This is what you had before, but showing only the 2,580 visual observations.
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

Thanks SkyBrowser.

Best wishes, Jeff.
RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

2021 September 11, at 2125 UT I make the nova mag 6.8 in my 80mm f5 refractor x18 hand held. Bob
RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

2021 Sept 15 at 2050 UT, mag 7.3. Sept 16 at 1955 UT, mag 7.4. 80mm Refr x18, hand held. Bob
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

I'm having no luck weather-wise. It's been clear this last two nights, up until just before it gets dark, and then it has either hazed over or fully clouded over. Same again this evening. It's just to hazy too see V1405, sadly.

I can see a very atmospheric rising waxing Moon, surrounded in a yellowing haze, a little like a scene from a Hammer Horror movie, along with a hazy bright ball of light that is Jupiter, but not much else.

Best wishes, Jeff.
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

Attempted to observe last night (17 Sept @ 9:30pm), but magnitude +6.6 was the faintest I could see. That was using an 8x56 binocular.

Last night's session was particularly depressing. The waxing Moon didn't help, but that said, the combination of local and distant light pollution, and poor sky transparency, left me with a naked eye limiting magnitude of around +3.3.

Best wishes, Jeff.
RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

2021 September 20 1940 UT. The nova seems to have bounced up a bit since the 16th. I make it mag 6.8 in an 80mm f5 refractor x18 hand held. Sky hazy and lit with artificial illumination and Moon. Main stars of Cas only just visible. Bob
RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

2021 September 22, 2055 UT. I make it mag 7.1 in an 80mm refractor x18, hand held, Bob
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

I attempted an observation last night (23 Sept at 10:45pm), using a 25x100 binocular, but it turned into a utterly frustrating session. For some reason I really struggled to identify the nova compared to the chart I have been using. By the time I was just getting myself sorted the sky transparency deteriorated so quickly, and within a few minutes it was just a pointless exercise. Even my view of Jupiter was abysmal. I had to settle for an atmospheric view of the waning Moon through charcoal grey wisps of cloud.

Edit: Also, just out of interest, this particular nova has a designation of V1405, but does anyone know if the star has a formal catalogue number?

Best wishes, Jeff.
SkyBrowser
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Re: Nova in Cassiopeia

Post by SkyBrowser »

jeff.stevens wrote: Fri Sep 24, 2021 4:10 pm Edit: Also, just out of interest, this particular nova has a designation of V1405, but does anyone know if the star has a formal catalogue number?
From AAVSO -

2MASS J23244772+6111149 CzeV3217 GALEX J232447.6+611114
Gaia21bpe IPHAS J232447.74+611114.7 N Cas 2021
Nova Cas 2021 Nova Cassiopeiae 2021 PNV J23244760+6111140
TIC 269819908 UCAC4 756-077930 URAT1 756-382411

Take your pick! Alphabet soup if you ask me ...
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

Thanks SkyBrowser, I'll pick my way through this.
RMSteele
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Re: Nova in Cassiopeia

Post by RMSteele »

2021 Sept 25 at 2030 UT, I make it mag 7.2 from a dark sky site in Northumbria with 10x50 binoculars. Bob
jeff.stevens
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Re: Nova in Cassiopeia

Post by jeff.stevens »

Clear skies this evening, and no interference from the Moon. I was using a chart printed from Stellarium for this observation, which currently has V1405 listed in its catalogue. Using a 25x100, I'm quite away off your last observation, Bob, but I really do struggle with variable stars.

My estimate was around +8.1. I thought it was fainter the +8.05 star HIP 115661 and brighter than the +8.25 star HIP 115542 - roughly half way in between the two.

The sky transparency was good, and the seeing was good. Scruffy diagram of some of the stars in the field of view attached.

Best wishes, Jeff.
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