Esempi di Descrizioni The Night Sky Observer Guide (nsog)




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Esempi di Descrizioni

The Night Sky Observer Guide (NSOG)


NGC 4236

8/10 " Scopes-75x: This extremely faint galaxy lies in a field of bright stars, its northern tip just 5' SSW of a 7.5 magnitude star. The halo is a very diffuse 4' x 1.5' NNW-SSE glow containing a broad central brightening, and requires averted vision to be seen well.

12/14 " Scopes-100x: NGC 4236 has a very largo, low surface brightness halo elongated 17' x 4' NNW-SSE and containing an irregularly concentrateti 5' x l' inner region that shows a slight mottling through its center.

16/18 " Scopes-125x: This ghostly streak is best seen at low power. The haze is very faint and diffuse, elongated 20' x 4' NNW-SSE, and extends nearly to a 10th magnitude star at its southern tip. The central region is broadly brighter but irregularly illuminateti, and contains a few indistinct patches at center and 5' north of its center. Several knots or faint stars are 5' SE of the galaxy's center, and half a dozen faint stars are embedded in the halo's southern extension. A 13th magnitude star lies 3' WSW of the galaxy's center.


Mazza (da www.galassiere.it)


4236 Dra 10" ottimo / buono
molto debole ed estesa, assai stemperata sul fondo cielo e con bassissima luminanza superficiale; è allungata grosso modo da N a S per almeno 15'; è più facilmente osservabile a 63x.

Caglieris

Con 25 cm


C_Il terzetto ha sotto più distante una stella di 5m, con ad angolo retto un'altra stella;centrare dalla parte opposta a questa ad una distanza all'incirca uguale.

O_Cé una corona di stelle (asterismo simile alla Crb).a forma di semicoppa. All'altezza del diametro, a formare circa un angolo di 45° macchia molto allungata, evanescente ma visibile, taglio lunghissimo, stimabile a metà del diametro della coppa. E' la gal. ngc4236, molto difficile (Bertucci dice di non averla vista con un 25cm). La galassia punta all'esterno della coppa verso una stella (di 10m ?), posta a 13' dal centro della gal.


Polakis


NGC 4236: Faint, low surface brightness galaxy, 15'x4' in p.a. 330 deg., with some patchy structure occasionally visible. Mostly uniform, except for a tiny faint spot on the S end and a brighter glow, 1' across, on the N end. The center has a very subtle slight brightening, broadly concentrated. The glow on the S end "blinks" with an OIII filter. A 14.5 mag. star is embedded in the center.

Observing Hanbook and Catalogue of deep-Sky Object


eg 4236 dimen. 19'x 6'9 V= 9.6 sfe. br. 14.7

In 25 cm this large, low surface brightness object is a 20'x 4' patch of light elongated in pa 160°. The halo grows very broadly brighter across the center, but there is no distinctly bounded core. In the slightly brighter centrai region is a very faint star that is probably the nucleus; another lies 4'5 SE along the E flank. The nebu­losity reaches almost to a mag. 10 star that lies 13' S. This galaxy is difficult to view in 30 cm. The faint, very low surface brightness haze extends to about 15' x 4' The halo has a slight, even concentration without a distinct nucleus. A faint stellaring in the halo is visible 4' NNW of center, and a faint star lies about 3' W.


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