It’s been cloudy here for several days and before tonight, my last estimate of V1369 Centauri was on Feb 10 at magnitude 6.2.
My latest visual estimate tonight (under the cross-hairs above) was magnitude 6.55, with 6.5 and 6.6 comparison stars.
My latest visual estimate of the nova is magnitude 6.0 (with comparison stars 6.0 and 6.1). Here’s the latest V and visual light curve.
The overall fading trend continues with some oscillations. The latest VSS newsletter has some interesting articles about the nova.
The nova is gradually on the way down, but it’s certainly not smooth. Here’s the latest light curve.
The cross-hair is on my latest visual estimate (5.85). Rob Jenkins (a fellow ASSA member) made a photometric observation (5.932, Johnson V) a couple of hours later. Subsequent visual estimates suggest the nova has brightened a little again.
A number of members enjoyed views of the nova in Centaurus (V1369 Cen). The cross hairs in the light curve below are over my visual estimate just after 1am; as in previous posts, the observations in purple show others I’ve made (only 5 up to this point).
The details of the observation are as follows:
When I first submitted the observation to AAVSO at around 3am, it was around 0.3 magnitudes brighter than the previous one. Others have since submitted more observations around the same time with similar magnitude values.
The nova was clearly visible to the unaided eye from Stockport at that time, as were the 4.7 and 4.3 comparison stars I used for the estimate (shown, by the conventional labels, as 43 and 47 above).
An observation a couple hours earlier at around 10:30pm when the nova was closer to the horizon was around 4.8 but I was a little uncertain of the estimate due to the low altitude so I didn’t submit that one to AAVSO.
Will the current rise continue past the last peak? The only way to find out is to keep watching!
I also made visual estimates of the Classical Cepheid l Carinae and LBV (Luminous Blue Variable) η Carinae. I had aimed to make estimates of others (R Carinae and V Puppis) but didn’t quite get there. I was too busy having a good time looking at other objects through my Meade LX-90 ‘scope and sharing views with ASSA members.
I made a visual estimate of magnitude 4.4 of the nova overnight. Subsequent observations show that it has dropped further since.
Here is the updated light curve:
The observation under the cross-hairs is my last (magnitude 4.4) observation and the others in purple (click image to enlarge) are the estimates I’ve submitted to AAVSO so far.
Sebastian Otero’s latest forum reply asks whether the current fading will be the nova’s last one and suggests possibly not, given its erratic behaviour so far.
I just made an estimate of V1369 Cen (at about 2am on Dec 29) at magnitude 4.3. It may actually be closer to 4.2 but I could not convince myself of that with respect to nearby magnitude 4.0 and 4.3 comparison stars. Visual and Johnson V observations are shown below (via VStar), with my estimate in the cross-hairs and a polynomial fit (in red) to make the outline of the light curve more obvious.
Regarding the polynomial fit, bear in mind of course George E.P. Box’s maxim that:
Essentially, all models are wrong, but some are useful.
So far, 628 observations have been submitted to AAVSO. Of these, 214 are visual observations.
What a fascinating, meandering, unpredictable progression. I’ll try to monitor this nova as much as possible over the next week, while still on holidays.