Time Sensitive Alerts

Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 10/16/2012 - 20:48

Please use this thread to distribute time sensitive observation alerts.  Those interested in receiving such alerts can subscribe to this thread using the instructions below.

Clear Skies!


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Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
PNV J18523496-0018423 very reddened -> faint in visual band

This star is located in a very reddened field. According to BRVI photometry of  S. Kiyota the B-V=3.21.

My DSLR photometry showed this star at 13.71TG last nigt.

Checking my DSLR images of the Landolt SA110 field there was nothing visible at the given position down to 14.7TG on 5 July 2011.

PNV J18523496-0018423   2011 07 05.97  <14.7TG
PNV J18523496-0018423   2012 10 20.722  13.71TG

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
re: PNV J18523496-0018423 very reddened -> faint in visual band

Has this one faded dramatically?  I have nothing at that position down to mag 14.2 in an unfiltered RGB image tonight at 11:04, 21 Oct 2012

I don't think so. It is just way too red: B-V=3.1! This is why this PNV is so faint in V or TG. The infiltered CCD images show this star much brighter since they are more sensitive in R and I band.

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
PNV J18523496-0018423

John,

use this name: PNV J18523496-0018423

This morning I've already submitted two DSLR observations via Webobs.
AUID: 000-BKS-398

Affiliation
American Association of Variable Star Observers (AAVSO)
PNV J18523496-0018423

John, you can use  PNV J18523496-0018423. Be sure to include the spaces as they appear here. The AUID is  000-BKS-398 if  you prefer something shorter.

We try very hard never to announce a seqeunce as being available for a star you can't submit data on. If it needs an AUID we get one assigned ASAP.

Mike

Affiliation
None
NGC3344 Possible SN

Possible supernova in ngc3344 (R:10 43 34, D:24 53 29). This is a fairly nearby Gx and the SN may get bright. Light travel time = 0.040 Gyr according to NASA NED.

----Andy

Affiliation
None
PNV J18194217-1442357

Cloudy tonight so didn't get a shot.  My last image including the field was 17.42 Oct 2012 UT, fainter than mag 11.5 unfiltered (DSLR).

SS Cyg

SS Cyg looks like it's headed up.  We may be able to help e-MERLIN trigger TOO radio wavelength observations if we can confirm; see Special Notice #279.  Any observations of SS Cyg tonight would be appreciated.  Please submit via WebObs *and* reply here if possible.

Thank you!

Affiliation
American Association of Variable Star Observers (AAVSO)
SS Cyg Continuing into outburst

Observations taken tonight at JD 2456226.605 show continued and accelerating brightening.  Data submitted to WebObs - B=10.57, V=10.23, R=10.01 and I=9.79

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
SN 2012ht - brigth supernova in NGC 3447

This type Ia SN was discovered ~1 week before it's possible maximum.

http://www.cbat.eps.harvard.edu/unconf/followups/J10532275+1646349.html

Further reference: CBET 3350

Still rising, lates observations show already around ~14.3CR.

http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-recent-sn/4077

I'll try to create an AAVSO sequence for this bright SN.

Calculating with 31.51 magnitude distant modulus of the host galaxy this SN can even reach ~12.2 magnitude at maximum...

Clear skies,

Robert Fidrich (FRF)

Affiliation
Svensk Amator Astronomisk Forening, variabelsektionen (Sweden) (SAAF)
Possible nova in Cepheus

I estimated the object to be 11.5 visual at 18:01 UT February 2, using comparison stars from the Tycho catalogue. Instrument: 20 cm Newton.

/Gustav, HGUA

Affiliation
American Association of Variable Star Observers (AAVSO)
Nova Cep 2013

Does anyone have a tricolor image of nova cep 2013 and its environs?  Something in the degree or larger regime would be nice.  Otherwise, I'll see if I can get one from BSM-Berry.

Arne

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
re: Nova Cep 2013 and NGC 7510

I have a DSLR image with 300mm focus, but my images are quite greenish - maybe white balance issue with IRIS? V Cas, UV Cas, N Cep 2013 and NGC 7510 are visible on the images. The limit is around 14.0 mag.

http://www.flickr.com/photos/26731206@N05/8444027583

It was overcast until 9PM, and by the time the sky became clear N Cep 2013 was quite low  on the sky, where the light pollution of Budapest also made it worse. Probably a BSM/Berry image would be more beautiful, but it you want I can try to play with the white balance and or remove the light pollution from the image...

Affiliation
American Association of Variable Star Observers (AAVSO)
Nova Cep 2013

Thanks, Robert!  That will do nicely as a placeholder; let me see how the BSM image turns out.  In the meantime, if you can do the ID marking of the nova, NGC 7510, etc. as you offered, that will help a lot.  I need this kind of an image to present in my upcoming talk at a local amateur club.

Arne

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
re: N Cep 2013

I have to leave the office. I can do it at home tonight. I hope it will be not too late within 2 hours.

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
N Cep 2013, V Cas, UV Cas and NGC 7510 tricolor image

Nova Cephei 2013 (N), VSX J230915.4+605855 (SR) and the open cluster NGC 7510.

http://www.flickr.com/photos/26731206@N05/8446619830/in/photostream/

A wider FOV:

Nova Cep 2013 (N), V Cas (M), UV Cas (RCB), VSX J230915.4+605855 (SR) and the open cluster NGC 7510.
03/04 February 2013, Pesterzsébet, Budapest, Hungary.
Canon EOS 1000D, 300mm (zoom) telephoto lens, 12x30 stacked images.
The brightness of Nova Cep 2013 was around 11.5TG.

http://www.flickr.com/photos/26731206@N05/8446847014/in/photostream

Affiliation
American Association of Variable Star Observers (AAVSO)
RR Tau

Observed RR  Tau last night.  This YSO/UXOR looks like its fading.  Saw about 0.1 mag last night over several hours.  Observations tonight might be interesting.  Will cross post on YSO forum.

Gary

WGR

Affiliation
American Association of Variable Star Observers (AAVSO)
BT Mon activity?

I think I observed it at v=14.6 last night, but there is a very close companion which makes visual estimation difficult. Rod Stubbings thought he saw a combined 13.8 there, but later said the variable was <14.4.

Could someone with a high resolution CCD please check this star?

Thanks!

Mike LMK

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
MASTER OT J212444.87+321738.3 - new very bright (10.7) variable

MASTER OT J212444.87+321738.3 - new very bright variable in Cygnus

"MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 21h 24m 44.87s +32d 17m 38.3s on 2013-03-13.84134 UT. The OT unfiltered magnitude is 10.7m (limit 16.9m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image with OT at 13.5m on 2012-10-21.52326 UT (magnitude limit 18.5m). The object is close to saturation on Mar. 13 images, so the real magnitude may be yet brighter."

More info: ATel #4888

Affiliation
American Association of Variable Star Observers (AAVSO)
OT_J2124

Further to my posting above, I looked at the Y-band (1micron) image from APASS.  The MASTER variable is present, and quite bright:

ftp://ftp.aavso.org/public/aavsonet/apass/ot_j2124y.jpg

This is a short exposure at a wavelength that CCDs are quite insensitive, so only the brightest objects show up.  Nonetheless, this shows that the MASTER OT is an extremely red object (supported by the 2MASS and WISE observations), either some red star or something suffering considerable extinction.  It is interesting just from that aspect.  However, it also shows why unfiltered observations often give a false impression as to the brightness of a target.  I'd be interested if any visual observer or V-band imager is able to measure this star.

Arne

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
re: V wanted

Arne,

When were these APASS images made? Isn't any image with V filter in APASS?

Aladin listed a 19th V magnitude object according to GSC2.3 - I wonder where this "V" magnitude in GSC2.3 came from...

Anyway it seems tonight will be clear in Hungary. I'll try to make some DSLR images with my 300mm (zoom) telephoto lens. Using 10-20x30s co-added images I can go down to ~14.5TG.

Affiliation
American Association of Variable Star Observers (AAVSO)
V wanted

Hi Robert,

APASS is currently observing in B,V,g,r,i,z,Y.  However, this particular observation was inserted into the queue very quickly, and I did not set up the observing plan properly.  Only two images were taken: B and Y.  We probably won't revisit the field with APASS.  There is likely archival data for that field with deeper images that will be made available in DR7 or DR8.

The B,Y images were taken 2013-03-15 around 11:42UT.

Arne

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
re: Possible SN in M65

PSN J11185695+1303494

Discovered by M. Sugano, Kakogawa, Hyogo-ken, Japan using 0.35-m f/11.0 Schmidt-Cassegrain + unfiltered CCD, which was confirmed on following ten frames taken during about one hour after discovery. Measurement has been done by K. Kadota, Ageo. Nothing is visible at this location on a frame taken on 2012 Dec. 10 UT (limit mag. wasn't reported).

http://www.cbat.eps.harvard.edu/unconf/followups/J11185695+1303494.html

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
will be bright?

Calculating with a distand modulus 30.46 (NED) a type Ia SN in M65 could reach 11.16 magnitude. Would be nice...

Affiliation
American Association of Variable Star Observers (AAVSO)
M65 SN

I have the Mt. John 61cm set up to get a BV image pair centered on the SNe candidate.  Those images should be taken in about an hour.  I'll post a finding chart based on those images sometime today (DSLR workshop in progress).

Arne

Affiliation
American Association of Variable Star Observers (AAVSO)
M65 B image

Here is a V image of the field using OC61 (60sec) from about an hour ago; there is something at the SNe location, but not very bright; my guess is that it is about 17th mag.

Arne

Affiliation
American Association of Variable Star Observers (AAVSO)
SN2013am

This again shows why unfiltered magnitudes often are unreliable estimates of brightness.  This SNe is reddened, and so is much brighter in the red than in a standard Johnson V bandpass.  That is why my image shows the SNe around 17th magnitude, while initial reports were as bright as 15.6mag.  As a TypeII, we won't be issuing an alert notice.  It would be a fun object for which to get a tricolor image, as it will be red and in the dust lane of this pretty galaxy.

Arne

Affiliation
URSA Astronomical Association, Variable Star Section (Finland) (URSA)
Possible Nova in Auriga PNV J06270375+3952504

The new object at coordinates 06 27 03.80 +39 52 49.4 (J2000.0) is confirmed by CCD images taken at Hankasalmi Observatory by A. Oksanen. Magnitude V=11.8 using close GSC 2931-0438 with V=10.9 as the magnitude reference.

Image: http://murtoinen.dyndns.org/ccd/ccd/NovaAur2013/NovaAur2013_20130403.jpg

arto

Affiliation
Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) (MCSE)
PNV J06270375+3952504 is a new UGWZ star?

According to Denisenko et al (MASTER OT team) the new object is an outburst of the blue star USNO-B1.0 1298-0172862 (06 27 03.705 +39 52 49.16 pmRA=0 pmDE=0 B1=20.71 B2=20.31), most likely a new variable of UGWZ (WZ Sge) type. Color-combined DSS finder chart (5'x5' FOV at 200% zoom) is uploaded to http://master.sai.msu.ru/static/OT/J062703+395250-BRIR5x5.jpg

Affiliation
American Association of Variable Star Observers (AAVSO)
USNO-B1.0 1298-0172862

Ran time series last night (130404 0013 UT to 0350). V Magnitude (VPhot ensemble) had slow decline from 12.35 to 12.45. Apparent period about 0.06 d. Amplitude about 0.05 p-p. Data on AID.

Ken