Autor Tema: Nova en Saxitario (e brillante)  (Leído 339 veces)

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16 de Marzo de 2015, 20:36:35


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Nova en Saxitario (e brillante)
« en: 16 de Marzo de 2015, 20:36:35 »
Ola a todos:
Acaban de descubrir unha nova 'nova' en Saxitario, a nº 2 deste ano. E parece ser que é brillante, está en magnitude 6, ou sexa que é moi doada para prismáticos e case a simple vista. Aquí vos deixo a alerta da AAVSO de hai uns minutos.

AAVSO Alert Notice 512
March 16, 2015

Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

Event: Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

Discovered by: John Seach, Chatsworth Island, NSW, Australia

Discovery magnitude: 6.0 using DSLR and 50mm f/1.0 lens

Discovery date: 2015 March 15.634 UT

Coordinates:  R.A. 18 36 56.84  Dec. -28 55 39.8  (2000.0)

Spectra: An optical spectrum by S. C. Williams (Liverpool John
Moores University) et al. (ATel #7230) obtained 2015 March 16.27 UT
using the FRODOspec spectrograph on the Liverpool Telescope at 2015
March 16.27 UT indicates N Sgr 2015 No. 2 is a classical Fe II nova.

J. Powles (PJOC, Latham, ACT, Australia) reports a low-resolution
(R=260, 150 l/mm) spectrum obtained by him appears to be that of a
Fe II nova shortly after maximum.

Observing recommendations: Observations of all types (visual, CCD,
DSLR, spectroscopy) are strongly encouraged as this nova evolves.
T. Finzell (Michigan State University) requests ongoing optical
coverage in support of radio and x-ray observations being scheduled.

Charts: Charts for Nova Sgr 2015 No. 2 may be created using the
AAVSO Variable Star Plotter (VSP) at

Observations reported to the AAVSO:
2015 Mar. 15.802 UT, 5.3 (K. Itagaki, Yamagata, Japan);
16.3131, 5.8 (AAX, A. Amorim, Florianapolis, Brazil);
16.3375, 5.9 (CLUB, L. Camargo da Silva, Brazil);
16.3604, 6.1 (Camargo da Silva);
16.5275, 5.8 R-CCD (E. Guido and N. Howes, 0.61-m f/6.5
astrograph+CCD) of ITelescope network (MPC Code U69, Auberry, CA);
16.74861, 6.0 (PEX, A. Pearce, Nedlands, WA, Australia);
16.77, 6.0 (CMQ, P. Camilleri, Warners Bay, Newcastle, NSW, Australia);

Submit observations: Please submit observations to the AAVSO
International Database using the name "N SGR 2015 NO. 2". Once
a GCVS name has been assigned, please use that name.

a. Assigned the name PNV J18365700-2855420 when posted to the IAU
Central Bureau for Astronomical Telegrams Transient Object
Confirmation Page (TOCP) at

b. Follow-up observations made by Seach on Mar. 2015 15.726 UT
showed a bright H-alpha source visible on 6 DSLR images using a
50mm f/1.0 lens and H-alpha filter. Seach reports nothing was
visible down to magnutude 10.5 on a survey image taken March
14.590 UT.

c. Position end figures
- K. Itagaki (Yamagata, Japan, using 0.5m f/6.8), 2015 Mar. 15.802
UT, 56.87s, 39.3"
- E. Guido and N. Howes (iTelescope network (MPC Code U69, Auberry,
CA), 2015 Mar. 16.5275, 56.85s, 40.0"

d. P. Schmeer (SPK, Bischmisheim, Germany) reports two USNO-B1.0
catalog stars within 6" of the nova: USNO-B1.0 0610-0784943,
position end figures 57.095s, 43.88", B1=17.17, R1=16.82, B2=16.86,
R2=16.42, I=15.55 mag; USNO-B1.0 0610-0784923, 56.912s, 38.88",
R1=14.36, B2=13.62, R2=13.65, I=15.08 mag; and a GALEX source 3.6"
from the nova: GALEX J183656.8-285539, 56.796s, 39.60",
NUV= 17.323 mag.

e. Images:
- E. Guido and N. Howes (iTelescope network (MPC Code U69, Auberry,
CA), annotated confirmation image:
- E. Guido and N. Howes, animation comparing their confirmation
image to archive POSS2/UKSTU plate (R Filter, 1996):

Congratulations to John Seach on his latest discovery!

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.