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PGIR19brv (AT2019qwf): another highly reddened galactic classical nova in Cygnus

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FRF
FRF's picture
PGIR19brv (AT2019qwf): another highly reddened galactic classical nova in Cygnus

The Palomar Gattini-IR. Palomar Gattini-IR wide-field NIR survey found a candidate transient generated in at a J band mag of 11.3 ± 0.02 mag on UT 2019-09-17.25 and at J2000 coordinates

RA: 21:09:25.52
Dec: +48:10:51.9

The source was not detected to a 5 sigma depth of 13.8 mag on UT 2019-09-14.27.
There is no source at the position of the transient in archival 2MASS images.
The transient is at a galactic latitude of 0.2 degrees, with a corresponding
integrated line of sight extinction of 14.6 mags in g-band and 3.1 mags
in J band (Schalfly et al. 2011). Subsequent detections of the source indicate
a steady rise to a magnitude of 10.6 ± 0.01 mag on UT 2019-09-24.26.

More details: http://www.astronomerstelegram.org/?read=13130

 

FRF
FRF's picture
Nothing visible on my 4x60s

Nothing visible on my 4x60s stacked DSLR images made on 19 September ~01:54UT (limit mag ~16.0TG).

File upload: 
FRF
FRF's picture
Quite bright in I-band

PGIR19brv is quite bright on the 2x90s I-band images I made using a 0.41m itelescope.net reflector at New Mexico this morning. Photometry will be done later.
I'll check my 2x90s V-band images soon.

FRF
FRF's picture
Visible on V-band images too

The nova is clearly visible on the 2x60s V-band images too, somewhere around ~17.0V. (Precize photometry will be done later.)

FRF
FRF's picture
AAVSO chart of PGIR19brv
DEY_VAR
PGIR19bvr (AT2019qwf) V & Rc

 

Using the 24-inch Norfolk State University Rapid Response Robotic Telescope (RRRT) located at the University of Virginia Fan Mountain Observatory and via the Skynet Robotic Telescope Network the follow photometry was obtained for PGIR19brv (AT2019qwf).

JD 2458752.61851 V 16.885 (0.042) from stack of 2 x 240s
2458752.62306 Rc 14.620 (0.013) from stack of 2 x 120s

V-Rc +2.265

James A. DeYoung (DEY)

hptuttle
PGIR19bvr Ic observations

Burleith Observatory, Washington, DC  0.32-m PlaneWave CDK + SBIG STL-1001E CCD Cousins Ic filter

4-min exposures.

Richard Schmidt (SREB)

DATE               MAGNITUDE  MAGERR 
2458752.6486468  13.11346  0.00788
2458752.6516127  13.11558  0.00797
2458752.6545631  13.09924  0.00802
2458752.6584173  13.11329  0.00806
2458752.6612855  13.10507  0.00796
2458752.6641528  13.09896  0.00790
2458752.6670183  13.10254  0.00797
2458752.6698858  13.10706  0.00797
2458752.6727531  13.10485  0.00799
2458752.6756206  13.09659  0.00787
2458752.6784884  13.11006  0.00818
2458752.6873806  13.10236  0.00810

 

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hptuttle
PGIR19brv (AT2019qwf) Ic observations

PGIR19brv (AT2019qwf)

New Ic photometry from Burleith Observatory Washington DC  Ensemble 6 comp stars + CK

39 images 4-min  0.32-m PlaneWave CDK + SBIG STL-1001E CCD + Cousins I filter

Mean JD    Mean m(Ic)   Mean MAGERR   st.dev

2458753.5834793  13.093 (0.0082) 0.0076

Previous night:

2458752.6658188  13.106 (0.0080) 

Nova brightening in 24 hours: 0.0126 mag(Ic)

Richard Schmidt

 

 

hfhenrichs
hfhenrichs's picture
MAGERR check?

to Richard Schmidt:

From the format it looks that the values of MAGERR were determined with MaximDL, based on 6 comparison stars. Could you verify the values of MAGERR independently, as MDL uses only the first comparison star while ignoring all others. This error is documented (forum MDL and AAVSO), and according to DL will be corrected in a newer version, yet to appear. 

hptuttle
MAGERR check?

I do not use MaximDL, I use C-Muniwin.

hptuttle
MAGERR.

  I do not use MaximDL,  I use C-Muniwin 2.1.27

res
res's picture
In that version MDL? 5.** or

In that version MDL? 5.** or 6.**? Or both?

hptuttle
PGIR19bvr (AT2019qwf)

Observations in Cousins Ic  October 2, 2019

Burleith Observatory 0.32-m CDK + STL-1001E CCD

8 x 4-min exposures

Mean HJD   2458758.70990341

Mean mag (Ic)   13.016   stdev.  +- 0.009

hptuttle
PGIR19bvr (AT2019qwf

The slow rise is continuing...

Latest Cousins Ic photometry:

Means of 33 4-min exposures, ensemble photometry 6 comps:

HJD                          mag(Ic)           magerr

2458767.54859939    12.924    0.0079

File upload: 
hptuttle
PGIR19bvr (AT2019qwf )

Latest Ic photometry mean of 43 observations

MJD 768.59793555    12.876   (0.008)

File upload: 
hptuttle
PGIR19bvr (AT2019qwf )

Still brightening...Cousins Ic, mean of 52 observations tonight.

2458771.5666724          12.8271        +/-0.0076 mean error

File upload: 
hptuttle
PGIR19bvr (AT2019qwf )

AT2019qwf is still on the rise. See latest Ic data from Burleith Observatory

Richard Schmidt

File upload: 
hptuttle
PGIR19bvr (AT2019qwf )

AT2019qwf is still on the rise. See latest Ic data from Burleith Observatory

File upload: 
hptuttle
PGIR19bvr (AT2019qwf )

AT2019qwf appears to have peaked and begun a slight decline. See graph.

There is preliminary indication that the orbital period is 3.7973 hours, epoch 2458758.6920 based on 318 observations over a time span of 17 days (reduced to nightly means).  Mean amplitude of curve fit 0.009 magnitude Ic.  Source: Peranso ANOVA, DCDFT, DFT and CLEANest period solutions.  VStar DC DFT standard analysis gives a period of 0.174846 days , epoch 2458758.692.

 

VStar analysis attached here...

Rich Schmidt

Burleith Observatory.

hptuttle
PGIR19bvr (AT2019qwf )

Following two days of decline, PGIR19bvr has now brightened to its max so far, 12.551 Cousins I band.

A possible orbital period is found: 3.7991 hr +- 0.0064  amplitude 0.010 based on 422 obs. time span 22.94 d.   Epoch 1458758.6920

Rich Schmidt

Burleith Observatory

hptuttle
PGIR19bvr (AT2019qwf) still on the rise

Latest point mean of 57 observations.

Rich Schmidt

Burleith Observatory

hptuttle
V2891 Cyg = PGIR19brv

Still on the rise tonight!

File upload: 
hptuttle
V2891 Cyg = PGIR19brv

Latest nightly mean Ic photometry...

hptuttle
V2891 Cyg = PGIR19brv

  Tonight mean of 34 4-min. exposures, I-band. 

MJD 794.53925256  11.922 (.008)

Richard Schmidt  Burleith Observatory Washington, DC

FRF
FRF's picture
CBET 4694: V2891 Cyg

Finally a CBET on V2891 Cyg (behind paywal):

"R. E. Schmidt, Washington, DC, writes that he has derived an observed photometric period of 3.7991 ± 0.0048 hr and a polynomial fit of 0.018
magnitude for the mean amplitude at Oct. 2.192 UT in the Cousins I band from his 583 CCD images obtained during Sept. 26.17-Nov. 4.06 with a 0.32-mastrograph at the Burleith Observatory."

His nightly I-band photometry can be seen in the AAVSO light curve above.

"He adds that this indicates a very slow rising, perhaps indicative of 'F'-class novae such as DO Aql 1925."

http://www.cbat.eps.harvard.edu/.../004600/CBET004694.txt
 

hptuttle
V2891 Cyg = PGIR19brv Cousins I photometry

V2891 Cyg = PGIR19brv

Cousins I photometry from Burleith Observatory

 

MJD        Ic    Err
752.66581880    13.106    0.008
753.58347930    13.093    0.008
758.70990341    13.016    0.009
767.54859939    12.924    0.008
768.59793555    12.876    0.008
771.56667243    12.827    0.008
773.56186822    12.696    0.008
774.57765200    12.652    0.008
775.57886101    12.659    0.008
780.55384379    12.718    0.008
781.55132119    12.551    0.008
784.55128261    12.529    0.008
789.57086300    11.894    0.005
790.54321827    11.782    0.006
791.55758836    11.794    0.007
794.53925256    11.922    0.008
797.50008805    11.772    0.010
798.48570537    11.658    0.008

 

 

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hptuttle
V2891 Cyg = PGIR19brv

Tonight's mean of 24 images

MJD     Ic     Mag err

799.50445  11.866 (0.017)

RIch Schmidt

Burleith Observatory

hptuttle
V2891 Cyg = PGIR19brv

Nova V2891 Cyg still brightening as of last night. Mean of 30 images Burleith Observatory:

MJD           Mag Ic           MagErr

800.531600   11.468   (0.009)

hptuttle
V2891 Cyg = PGIR19brv

This novai is still on the rise, very much worth watching!

See chart...

hptuttle
V2891 Cyg = PGIR19brv

V2891 Cyg Nightly means
Burleith Observatory
Richard Schmidt
MJD        mag Ic   magErr
752.66581880    13.106    0.008
753.58347930    13.093    0.008
758.70990341    13.016    0.009
767.54859939    12.924    0.008
768.59793555    12.876    0.008
771.56667243    12.827    0.008
773.56186822    12.696    0.008
774.57765200    12.652    0.008
775.57886101    12.659    0.008
780.55384379    12.718    0.008
781.55132119    12.551    0.008
784.55128261    12.529    0.008
789.57086300    11.894    0.005
790.54321827    11.782    0.006
791.55758836    11.794    0.007
794.53925256    11.922    0.008
797.50008805    11.772    0.010
798.48570537    11.658    0.008
799.50444928    11.866    0.017
800.53159988    11.468    0.009
802.55091400    11.233    0.008
804.49734345    11.447    0.007

 

hptuttle
V2891 Cyg = PGIR19brv

Latest photometry from Burleith Observatory...

File upload: 
hptuttle
V2891 Cyg = PGIR19brv

Latest photometry from Burleith Observatory...

hptuttle
V2891 Cyg = PGIR19brv

Latest photometry from Burleith Observatory...

 

FJQ
FJQ's picture
Spectrum Of PGIR19brv

Here is a Alpy600/LISA-IR spectrum I got of this object last month from Mt. Pinos, CA:


PGIR19brv

 

Not much data in the Visual, but nice OI(8446A) line in the IR.

James

p.s.  Now to submit the photometry data I've taken on it.........

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