Archive for March, 2015

Another Nova Sgr 2015 No. 2 update

March 30, 2015

I’ve made 10 observations of the nova since March 19, mostly visual, 3 DSLR, one of which has yet to be processed.

The (rather noisy) light curve is starting to show the kind of early oscillations that seem to be common in novae and certainly the last two bright novae I’ve seen. The red fit “line” helps to make this more obvious.

LC-and-20-degree-polyfit-2015-03-31

The cross-hairs are over my most recent observation early this morning.

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Nova Sgr 2015 No. 2 update

March 25, 2015

I made visual and DSLR photometric observations of the nova on March 21 and 22. The image below shows the nova before sunrise on March 22.

NovaSgr2015_2_Mar22-arrowed

The light curve shows my most recent submission under the cross hairs.

LC-2015-03-25

 

It appears that the nova has peaked but these objects are unpredictable so we may see some fluctuations yet. The local weather has made observations difficult for the last 3 days.

Nova Sgr 2015: first observation

March 19, 2015

The conditions at 6am today were not ideal: lots of intermittent cloud, or more accurately, intermittent gaps.

I estimated the nova to be at magnitude 4.9. It was substantially brighter than the 53 comparison star and may even have been brighter than the 47 comparison star (AAVSO chart ID 14582KC).

NovaSgr2015-2015-03-20

I marked the observation as “uncertain” (comment code Z on WebObs) and added the comment:

7×50 binoculars;AT LEAST mag 4.9;may have actually been brighter than 47 comp;intermittent cloud

Tomorrow morning, whether permitting, a brighter comparison star may be needed assuming this thing keeps brightening. Getting up early enough to make a DSLR observation would be nice too.

 

 

Nova Sgr 2015

March 18, 2015

There’s a bright nova in Sagittarius (PNV J18365700-2855420 where PNV = possible nova candidate, its discovery designation).

Like the last bright southern nova (Nova Cen 2013), this one was also discovered by John Seach in NSW.

The nova was discovered on March 15 so it’s early days yet. There are 35 observations in the AAVSO International Database.

NovaSgr2015-2015-03-19

I tried to get out to observe it this morning but it was cloudy. When the weather clears I’ll make visual and time-permitting, DSLR observations.