- Review of the 20” f/3.4 Reginato Supermaser
- Celestron PowerSeeker 127EQ
- North Star Equatorial Platform
- OGMA AP26CC Review
- iOptron HAZ-46 Alt Azi Mount Review
- Brandon Vernonscope 94mmF7 APO first impressions.
- A quick review of the iStar Phantom FCL 140-6.5
- Explore Scientific, 16 inch / F 4.5 Truss tube Dobsonian
- Celestron PowerSeeker 70AZ Telescope ($10 Scope)
- Orion EQ-26 Mount Review
- Review of Explore Scientific First Light 8
- Rebuilding my CGE Pro
- COUNTING SUNSPOTS WITH A $10 OPTICAL TUBE ASSEMBLY
- Hubble Optics 14 inch Dobsonian - Part 2: The SiTech GoTo system
- iStar Optical’s Phantom FCL 140-6.5 review
CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.
If you're like me, you have probably seen Jupiter, Saturn, the Orion Nebula, and all of the sky's showpiece objects more times than you can count. And while they are truly spectacular and well worth revisiting, you may be looking for something new, something challenging to observe.
Of the dozens of galaxy groups scattered around the autumn sky, the 136-million-light-year-distant NGC 51 group is one of the more difficult bunches to spot. Although they are not listed among Paul Hickson's compact galaxy groups, the six galaxies here are ideally placed near the zenith in early December evenings for observers at mid-northern latitudes. Its high altitude carries the group far enough above any horizon-hugging interferences that might spoil some of our other challenges.
Of the constellations that line the autumn Milky Way, King Cepheus, the king of Aethiopia in Greek mythology, is trod upon by relatively few amateur astronomers. While this is most likely because the constellation's brightest stars are faint compared to his wife, Queen Cassiopeia, the King has many royal deep-sky subjects is his own right that merit a look, including this month's challenge.
Pegasus is one of the best-known autumn constellations. Depicting the winged horse that Perseus used to rescue Princess Andromeda from the clutches of Cetus the Sea Monster, Pegasus flies high in our southern sky during October and November evenings.
Of the more than 80 planetaries listed by George Abell in his 1966 paper "Properties of Some Old Planetary Nebulae," Abell 70 (also known as PK38.1-25.4) is one of the most unique. Actually, the planetary itself is a stereotypical example of a ring nebula, like M57, with a round shell of gas expanding away from the dim progenitor star. But look carefully and there is clearly more here than just that.
The curtain opened on this challenge in September 1916, when a pair of articles written by Edward Emerson Barnard appeared in the journals Nature and The Astronomical Journal. Both recounted Barnard's discovery of a faint star in the constellation Ophiuchus that appeared completely unremarkable except for the fact that its proper motion was faster than any other star ever found.
One of the more interesting, and at the same time, challenging of Herschel's planetaries to view through 3- to 5-inch (7.6- to 12.7-cm) instruments is NGC 6369 in southern Ophiuchus. Nicknamed the "Little Ghost Nebula," NGC 6369 is an example of a ring-type planetary nebula, a faint version of M57. That is, if you can find it.
One of the great challenges facing even the most devoted lunar observers is trying to see the many small craters that dot the lava-covered floor of the walled plain Plato. Plato itself is a prominent impact scar measuring 62 miles across. It takes no more than 10x binoculars to see Plato once the Sun is up in its sky. In general, the best times to view Plato and its environs are about 1.5 days past First Quarter and again near Last Quarter.
The Coma Galaxy Cluster, Abell Galaxy Cluster (AGC) 1656, contains more than 800 galaxies brighter than photographic magnitude 16.5. It’s a real galactic forest that will take great patience to make your way through. There is no rushing this one. Unless you have enough time to devote to the task, best to push on to another target and come back here when you do. In fact, you will never get through this huge collection of galaxies in one sitting. Or even two, three, or four sessions, for that matter. AGC 1656 could well take years before every galaxy in view is recorded and identified.
M81 and M82 form perhaps the most famous pair of galaxies north of the celestial equator. Johann Elert Bode bumped into both quite by chance on New Year's Eve 1774. His discovery is commemorated today by M81's nickname, Bode's Galaxy. But his discoveries went unknown by his contemporaries. Both galaxies went unobserved for another 5 years until they were independently rediscovered by Pierre Méchain. Charles Messier incorporated Méchain's find into his burgeoning catalog some 19 months later. Bode, Méchain, and Messier missed fainter companions that are found nearby. Two more decades would pass before William Herschel discovered their dim glows, yet both of this month's challenges - NGC 2976 and NGC 3077 -- can be spotted through small backyard telescopes given good skies.
Several of the challenges I have profiled over the years have involved hunting down tiny planetary nebulae. Many planetaries appear very small as seen from Earth, which can make them difficult to tell apart from surrounding stars. This also works in our favor, however, since their small size focuses all of the available light into small discs with high surface brightnesses. Their existence is also accented nicely by using narrowband and oxygen-III filters, which help suppress light pollution. That's why planetary nebulae are far better targets for urban observers than some other types of deep-sky objects.