Nova en Sagitario

[Carlosfb]

Apareció una nova en Sagitario con Mag. V=7.7

acá la noticia en Sky & Telescope:

http://www.skyandtelescope.com/resource ... 91655.html

y este es el telegrama de la IAU con los últimos datos:

NOVA SAGITTARII 2012 No. 4 = PNV J18202726-2744263

Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan,

report their discovery of possible nova (mag 7.8 ) on two 40-s unfiltered CCD

frames (limiting magnitude 13.7) taken around July 7.4986 UT using a 105-mm

f/4 camera lens (+ SBIG STL6303E camera). Five 3-s unfiltered CCD confirming

frames (limiting magnitude 17.0) were taken around July 7.5091 using a Meade

200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera); they provided the

position for the new variable star as R.A. = 18h20m27s.26, Decl. =

-27d44'26".3 (equinox 2000.0), though they did not specify which image or

instrumentation was used for the astrometry. The variable was designated PNV

J18202726-2744263 when it was posted at the Central Bureau's TOCP webpage.

Additional magnitudes for PNV J18202726-2744263: June 12.637, [13.6

(Nishiyama and Kabashima); June 13.609, [13.3 (Nishiyama and Kabashima);

June 20, [13 (Hideo Nishimura, Miyawaki, Kakegawa, Shizuoka-ken, Japan, Canon

EOS 5D Digital Camera + Canon 200-mm f/3.2 lens; communicated by S. Nakano,

Sumoto, Japan); June 28, [9.0 (Hiroshi Kaneda, Minami-ku, Sapporo, Japan;

Nikon D40 Digital Camera + 105-mm f/2.5 lens; communicated by Nakano); June 29,

[8.6 (Kaneda); July 7.496, 8.9 (Nishimura; independent discovery on four 15-s

exposures as above; limiting mag 14.7; observing site Mt. Ogasa, Kakegawa;

position end figures 27s.11, 26".1); July 7.499, 7.8 (Kaneda; independent

discovery on four unfiltered 3-s frames as above; limiting mag 8.7; position

end figures 27s.59, 26".2; positional uncertainty stated as +/- 15"); July

7.520, 7.7 (Shizuo Kaneko, Kamiyashiki, Kakegawa, Shizuoka-ken, Japan;

independent discovery on two 10-s frames taken with a Canon EOS 5D Mark II

Digital Camera + Canon 200-mm f/2.8 lens; position end figures 27s.30, 26".5;

communicated by Nakano); July 7.613, I_c = 6.89 (Hiroyuki Maehara, Kwasan

Observatory, Kyoto University; 0.25-m telescope); July 7.617, R_c = 7.31

(Maehara); July 7.618, V = 7.77 (Maehara); July 7.620, B = 8.18 (Maehara).

Maehara also forwards a report from Mitsugu Fujii (Okayama, Japan), who

obtained a low-resolution spectrum (R about 500, range 390-950 nm) of PNV

J18202726-2744263 on July 7.629 UT with a 40-cm telescope at the Fujii

Kurosaki Observatory. The spectrum shows Balmer series, Fe II multiplets 37,

42, 48, 49, 55, 73, and 74; Na I D; O I 777.3- and 844.6-nm; and Ca II

849.8- and 854.2-nm lines in emission. These features indicate that the

variable is a "Fe II"-class nova. His spectrum has been posted at website

URL http://otobs.org/FBO/novae/pnv_j18202726-2744263.htm.

Saludos,

Carlos

[Borges]

Excelente noticia para tratarse de una zona actualmente a disposición y en una magnitud visible fácilmente con telescopios modestos