(IAAC) Obj: Virgo Galaxy Cluster - Inst: Celestron Nexstar 102mm f6, 6 refractor
anonymous at u15354731.onlinehome-server.com
anonymous at u15354731.onlinehome-server.com
Wed Jun 16 09:21:46 EDT 2010
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Observation Poster: Jose Ramon <joser416 at latinmail.com>
Observer: Jose Ramon
Your skills: Intermediate (some years)
Date/time of observation: Spring 2010
Location of site: Colmenarejo, Madrid (Spain (Lat 40 33', Elev 899)
Site classification: Suburban
Sky darkness: 6 <Bortle Scale (9 worst)>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Celestron Nexstar 102mm f6,6 refractor
Magnification: *23, *46, *79
Filter(s): None
Object(s): Virgo Galaxy Cluster
Category: Cluster of galaxies.
Class:
Constellation: Vir
Data: mag size
Position: RA : DEC :
Description:
OK, here's the second part of the observation campaign of the Virgo Cluster of
this year. As promised, this one will focus on its northern part, where one
can find most of its brightest spiral galaxies. Here we go:
*NGC 4064. Peculiar spiral galaxy in Coma Berenices and quite far of Virgo's
center. Very elongated NW-SE, well defined, little gtradient, needs *79 power
and a bit of averted vision to see it.
*M 98. Nearly edge-on spiral galaxy also in Coma Berenices. Needs *46 power to
start to see it and the help of a chart. Elongated N-S, well defined, little
gradient.
*M 99. Face-on spiral galaxy that at *23 can be seen (with difficulties), but
that with higher powers become much easier to see. Largue, round (perhaps some
elongation E-W), high luminosity gradient, diffuse ill-defined edges. Very
beautiful (one of my favourite spirals); looks like an unresolved globular.
*M 100. Altough this spiral it's considerated by some authors as the larguest
galaxy of the cluster, looks quite small. Can be guessed at *23 and at *46 and
higher appears as a round patch of light with well-defined edges and no
gradient; I suspect I'm seeing just its core (see the beautiful HST images).
*NGC 4212. An unexpected surprise. Despite being a late-type (Sc) and faint
(11th magnitude) is clearly visible at least *46 power as an elongated E-W
patch with little gradient and a bit ill-defined edges. Has a 11th magnitude
star some minutes to the south that helps a lot in locating her.
*NGC 4216. Nearly edge-on spiral galaxy. As with M99, at *23 can be guessed
and at higher powers is seen with no difficulties. Seen as a needle of light
well defined, with no gradient, and elongated N-S.
*M 85 & NGC 4394. Largue lenticular galaxy (M 85) and one of the brightest
galaxies of Virgo. Easily seen even at low powers as a well-defined patch
elongated N-S with no luminosity gradient and forming a pair with a 10th
magnitude star to the SE. With higher powers and averted vision, her companion
the barred spiral galaxy NGC 4394 can be seen a few minutes to the east as a
faint, round and diffuse patch with some luminosity gradient.
*NGC 4450. Peculiar spiral galaxy. Needs at least *46 power to start to see
it, looking as a patch of light elongated N-S. Well defined, no luminosity
gradient.
*NGC 4419. Another nearly edge-on galaxy to the N of M88. Needs at least *46
power to start to see it. Very elongated SE-NW, little luminosity gradient,
well-defined.
*M 88. Largue and bright spiral galaxy (one of the larguest and brightest
spirals of Virgo). Between a 9th magnitude star and one double star formed by
two 10th magnitude stars (closer to the former). Bright -can be seen with just
*23 power-, elongated N-S (a bit NW-SE), well defined, little gradient; seen
photos of it, it seems I saw (as always) just its central region.
*M 91. Barred spiral to the E of M88. At *46 pops up and despite being
classified as one of the hardest Messier, it's not hard to see it. Largue,
elongated E-W, ill-defined edges a bit diffuse, little luminosity gradient, at
*79 seems to have its center "fatted" respect to the rest of the galaxy (once
compared with photos, becomes clear I saw the bulgue and the bar)
--
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www.visualdeepsky.org/enter-log.html
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