10 Attachment(s)
Adventures in the White Mountains (Part I)
On August 30th 2016 I headed out for a 5-day camping/stargazing adventure in the White Mountains. The drive through Yosemite was crowded with summer tourists but gorgeous as usual, with a crystal-clear view of the north side of Half Dome from Olmsted Point and an exhilarating ride down the dramatic eastern slope of the Sierras to highway 395. I decided to spend a couple of hours at Mono Lake, exploring the unworldly Tufa columns and formations along the south shore.
The next day I met up with Al Smith (Santa Cruz) for breakfast in Bishop and drove up to Grandview Campground, the gateway to the Bristlecone Pine Forest in the White Mountains at an elevation of 8600 ft. This is a very primitive site, in terms of camping – no water, no food, no flush toilets, no trash cans, little shade. The attraction is stunning views along the road of the entire length of the Sierra Nevada, walking among the oldest trees in the world (up to 5000 years old) and observing in one of the prime dark locations in California.
Attachment 2253
At the campground Al and I met up with Bruce Sokol from southern San Diego county, who had already reserved several camping sites for the rest of our group that would be arriving within the next day. In the afternoon, Jimi and Connie Lowrey drove in from West Texas in their camper (3 day drive) and Paul Alsing and Debbie Searle, Kemer Thomson and John Hoey arrived from the San Diego area, Later we were also joined by Carter Scholz from Berkeley.
In this mountain region during the summer there is always a decent chance of waves of moist and unstable Monsoon flow moving in from the southwest desert and wiping out observing prospects. But we were fortunate to have at least 5 consecutive crystal-clear nights (by the time Jimi, Paul and Debbie left) with SQM readings in the 21.7-21.8 range. We noticed a trace of smoke to the west at sunset on the first night but it had no affect on observing.
Our group shared views through two 24" f/3.7 aluminum scopes, two 18" Obsessions (a Classic and a Ultra Compact), and a homemade 16". I prepared my usual eclectic list of observing targets for my 24" – bright NGC and dim Abell planetaries, Palomar globulars , interacting Arp and Vorontsov-Velyaminov pairs, small galaxy groups and Superthin galaxies – and ended up tracking down (with the help of Jimi Lowrey) 109 objects over 4 nights. Here’s are some observations from the first two nights, all with my 24”. Unless otherwise noted, all images are from the Sloan Digital Sky Survey (SDSS).
Attachment 2254
MCG +12-02-001 = PGC 3183
00 54 03.6 +73 05 12
B = 15.6; PA = 134°
On the DSS and HST image above, MCG +12-02-001 is fascinating interacting group of at least two galaxies within 20". The main galaxy is a LIRG (Luminous Infrared Galaxy) with an active nucleus and strong emission lines. It’s likely a merger of two more galaxies itself.
Unfortunately this is a dim target (B = 15.6) and visually it appeared as an extremely faint, round glow, only 15” diameter, with a very low surface brightness. A small group of four mag 14-15 stars (roughly forming a parallelogram) lies 2' NE. Located 7' SW of a very wide mag 8.6/9.3 pair [1.3' separation]. This is a tough galaxy to track down in a lonely region of northern Cassiopeia.
Attachment 2255
III Zw 22 = Shakhbazian 38
01 10 52.1 +08 19 22
V = 16.5; Size 0.6'x0.2'
III Zw 22 is a VERY compact chain (total length of only 33”!) of 4 galaxies in Pisces oriented WSW-ENE. The halos are merged on the SDSS image above. It was picked up as a very faint, small glow at 200x. At 375x it was still unresolved (the brightest individual galaxy is mag 16.5V), but clearly elongated WSW-ENE, ~0.4'x0.15'. A mag 16 star (white star to the lower left of the chain) is less than 30" ESE.
Attachment 2256
Taffy II Pair = UGC 813/816 = VV 769
01 16 16.5 +46 44 25
V = 13.9/13.3; Size 1.2’x0.5’ and 1.7’x0.8'; PA = 110° and 170°
Like the original "Taffy" galaxies UGC 12914 and 129155, these post-collisional spiral galaxies in Andromeda are joined by a synchrotron radio bridge whose brightness contours resemble stretched bands of taffy. Most of the H I gas was stripped by the collision ~50,000,000 years ago and now lies in the bridge. This paper has all the details.
At 375x UGC 813 appeared faint to fairly faint, very elongated ~3:1 WNW-ESE, 0.55'x0.2'. A mag 16 star is superimposed at the ESE end. UGC 816, just 45” NE, is the slightly brighter member of the pair. It appeared fairly faint, fairly small, elongated 3:2 N-S, 0.6'x0.4', slightly brighter core. The beginning of the northern spiral arm was just visible bending to the west.
Attachment 2257
Kohoutek 1-16 = PK 94+27.1 = PN G094.0+27.4
18 21 52.2 +64 21 54
V = 14.6; Size 130"x100"
Here’s a very unusual target – a challenging planetary (Kohoutek 1-16) in Draco with a relatively bright distant quasar at its edge!: The planetary was picked up at 200xusing a NPB filter as a very faint, fairly small, roundish glow, roughly 40" diameter. The 15th magnitude central star was occasionally visible with the filter and was easily visible continuously unfiltered. A mag 13.3 star is just off the east side.
KUV 18217+6419, a 14th magnitude quasar at 3.4 billion light-years distant, was easily visible as a “star” off the southeast side, 1.4' from center! Talk about a contrast in distances!
Attachment 2258
UGC 11798 trio
21 43 27.0 +43 33 19
V = 14.3; Size 1.7'x0.3'; Surf Br = 13.4; PA = 137°
This remarkable triplet lies in the rich star fields of Cygnus, far afield from the usual galaxy hunting grounds. At 322x UGC 11798 appeared fairly faint, moderately large, very elongated 4:1 NW-SE, 1.0'x0.25', broad weak concentration. UGC 11797, just 1.8’ NW, is slightly smaller and seen as a faint, moderately large glow , very elongated 4:1 or 5:1 E-W, 0.7'x0.15', nearly even surface brightness. The major axis is collinear with mag 8.5 SAO 51224 2.2' W. On the SDSS image above, a tidal arm or plume from UGC 11798 appears to wrap around UGC 11797. UGC 11801 si 1.2’ ESE of UGC 11798 and was logged as fairly faint, fairly small, elongated 5:3 WSW-ENE, 25"x15", broad concentration. A mag 15.2 star is at the northeast end.
Attachment 2259
UGC 12342 = VV 738
23 04 53.5 +16 40 42
Size 1.3'x0.4'; PA = 139°
The SDSS image above reveals an apparent interacting pair with a distorted blue looping galaxy on the south side. This system has a similar appearance to UGC 10402 = VV 560. Using 375x I found it fairly faint, fairly small, elongated roughly 2:1 ~N-S. There appears to be a brighter knot at the north end that bulges out to the northwest. On the SDSS this feature appears to be the nucleus of the galaxy or the northern component of the two distorted galaxies. An unequal 5" to 6" double star [mag 11-11.5 primary] is 3.3' NE. Located 7.3' NNW of mag 6.4 HD 218101. UGC 12350 lies 13’ NE. You’ll find this strange galaxy in Pegasus.
Albert Wilson of Cal Tech discovered this sparse globular cluster while examining the Palomar Observatory Sky Survey plate in 1955. It's one of the smallest, and faintest globular clusters in the Milky Way. Although it resides in the halo of our galaxy, its highly eccentric orbit brings it relatively close to the galactic center every billion years or so. During one of these plunges, gravitational forces strip away its remaining halo stars. Palomar 13's latest close approach was ~70 million years ago and it is thought the next passage through the galactic plane may be the final demise of the cluster.
At 324x, all that is visible is an extremely faint glow, roughly 0.4’ in diameter, with a very low surface brightness. It only occasionally “popped" but the precise position was confirmed using the nearby double star BRT 1364 = 11.4/11.9 pair at 4.5” (merged on the SDSS image above), which lies just 1.7’ E. A mag 15.5 star lies 0.8’ N of the dim globular. NGC 7479, a beautiful barred spiral, is located 38’ SW!
Attachment 2261
NGC 7559
23 15 46.6 +13 17 25
V = 13.7; Size 1.0'x0.8'; Surf Br = 14.0
At 375x the main NGC galaxy is moderately bright, fairly small, slightly elongated, 45"x35", small bright core. A mag 15.5 star is 0.8' NE. My main target was the companion at the edge of the halo. With averted vision, NGC 7559A was seen just off the NNW edge [24" from center]. It appeared extremely faint [V ~15.5] and small, perhaps 8" diameter. On the SDSS image above NGC 7559A is an edge-on galaxy, but I probably only noticed the brighter nucleus. It was a bit easier to view at 282x. NGC 7563 lies 6.2' SSE. A mag 9.3 star 8.7' SW forms the vertex of an isosceles triangle with NGC 7563 and 7559.
Attachment 2262
NGC 7625 = Arp 212 = VV 280
23 20 30.1 +17 13 32
V = 12.1; Size 1.6'x1.4'; Surf Br = 12.8; PA = 60°
Halton Arp placed NGC 7625 in his category of galaxies with "Irregularities, absorption and resolution”. This Pegasus galaxy is rich in gas, criss-crossed by several dust lanes and contains numerous HII regions, which are indicative of violent star formation. It has been proposed NGC 7625 is a post-merger, though only a single disturbed galaxy is seen.
At 375x it appeared bright, moderately large, roundish, well concentrated with a large bright core that is irregular and mottled and a small nucleus. The halo is much fainter and extends at least 1.0' diameter. With careful viewing I had the impression there was two close nuclei or perhaps a knot was close to the nucleus. The DSS and SDSS shows at two or more intersecting dust lanes, though this feature was not confidently seen.
(continued as I've reached the image limit)
