Another Nova Cen????????

[Merlin66]

While testing a low res spectroscope last night I found an image of a 11 mag star which doesn't show on the UCAC4 catalogue.

RA: 14h37m27.98s
Dec: -60d53m08.5s

Close to UCAC4-146-159258 (Mag 11.3) and UCAC4-146-159279 (Mag 10.5)

Has anyone got images of this area around Alp Cen???????

[Merlin66]

Hmmm
Nothing showing on the DSS images......

[StuTodd]

Had a look in MPC too Ken. Simbad comes up with a target close to a NIR object.

[Stonius]

Is it just me, or does it look slightly diffuse?

[Merlin66]

Markus,
I think you're correct.
This was a trial image with a grating spectrograph - the focus in the red I believe was compromised.

A comparison (non spectrograph) image needs to be taken for verification.....

[Merlin66]

I'm coming to the conclusion that it may have been a brightening of the NIR star IRAS 14336-6040. This would go some way to explaining the slightly larger (out of focus?) red stellar image.

(I was using a FULL spectrum modded Canon D1000 on an ED80.)

[StuTodd]

Yes, that was my conclusion too from the Simbad result.

I know the object was diffuse but didn't look like an optical light anomaly/reflection.

Have you asked anyone for a confirmation image Ken? Total cloud here for weeks.

Stu

[Rob_K]

Hi Ken, I imaged this field every night from 02 to 06 April and there was nothing showing at the co-ordinates you gave down to around mag 12.5. I missed the next two nights but tonight I imaged the field a bit more deeply and there's nothing showing down into the mag 14s.

However, I can't reconcile your co-ordinates with the image you posted, the stars don't seem to match up. In fact I can't really fathom what your field is - could you supply a scale & north arrow? Thanks.

EDIT: Hang on, my mistake, -60!!! Be right back! :rolleyes:

Cheers -

[Merlin66]

Rob,
North to top.
The attached screen dump from CdC UCAC4 may help.
X marks the spot!
Ken

[Rob_K]

Yeah, got it Ken, something faint there, probably around 13.3 - 13.4 ~V. 10:52, 09 Apr 2018 UT, DSLR & 200mm lens, 5 x 15 sec, ISO 6400, F/6.3. Huge extinction at that location! On 6 Apr it's under a diffraction spike. On 5th April, something at limit of detection is visible at the location (55mm lens, limiting mag ~12.5). Earlier shots are indeterminate. Tonight's image attached.

Cheers -

[Rob_K]

According to this, extinction is somewhere 20-24 magnitudes in V-band, depending which system!!
https://irsa.ipac.caltech.edu/workspace/TMP_074ATm_20533/DUST/14h37m28s_-60d53m09s.v0001/extinction.html

Cheers -

[Rob_K]

Yep, ASAS J143728-6053.2 (IRAS 14336-6040) would be a good guess I reckon, very close to your given position.

Cheers -

[Rob_K]

Latest ASAS-SN light curve for this object is here (last 20 days):
https://asas-sn.osu.edu/light_curves/46e40026-c15e-4302-9d45-bf227de36370

On the rise.

Cheers -

[Merlin66]

Rob,
Thanks very much for adding that very useful data.

Simbad gives a 5.46 mag in the J band (1.05 - 1.34 micron) - this is a bit of a stretch for the Canon - The Full Mod, both internal filters removed.
This does allow recording to at least 8000A, where the 2nd order spectrum kicks in.

[StuTodd]

Good to be of help Ken.

[gary]

Gaia DR2 5878471748912790016 is within a couple of arcseconds of the
given RA/Dec coordinates with a G-band mean magnitude of 19.37