Posts Tagged ‘Meteorite’

Lost in the Orange Haze

Tuesday morning’s off-track observing session left me a little disappointed but it hadn’t diminished my determination to nail down M44 and M67 in Cancer as well as M76 and NGC 1499 (The California Nebula) in Perseus. As Tuesday’s unsettled sky wavered in and out of clear spells and overcast gloom, I slowly felt any chance of another observing session slipping away; how wrong could I be?

Well, a lot as it so happens! As I glanced out of the window for the final time late on Tuesday night I saw that the clouds had all but drifted away and large patches of clear sky had managed to break through. Taking a chance, I waited till the constellation Cancer had cleared the roof tops and then headed out at 01:30 UT early on Wednesday morning.

Unlike my previous session I decided to use the 10×50 Bresser bins to find my quarry rather than the hefty Strathspey 25×100s. Moving out into the middle of the back yard I turned to the south east where I could see the mighty Leo rising into the sky. Moving slightly to the west of Leo I began scanning the sky for Cancer unaided. It was a little hard to make out against the orange haze being cast up by the local light pollution, but I eventually found Acubens and Al Tarf, the two stars that make up the lower portion of the constellation. Moving up from here I could just about see Asellus Borealis, and by using a little averted vision I then managed to make out Asellus Australis. This was the important part of my search as I knew finding these two stars would lead me to M44, The Beehive Cluster.

Reaching for my 10×50 bins I tracked back across my original path in the sky and star hopped my way to The Beehive. It really was a fantastic sight and well worth the effort. The cluster itself showed up as a myriad of glowing stars that traced out an almost spherical shape in the sky. A beautiful DSO and one that I’m sure I’ll get around to sketching very soon. Unfortunately a small blanket of cloud slowly drifted over Cancer forcing me to temporarily postpone my search for the smaller cluster M67.

Instead I turned my attention to Collinder 70, otherwise known as Orion’s Belt. Now, I didn’t have a clue that this was an open cluster of stars until I read one of The Rev Aaron’s posts over at Caffeinated Astronomy. This is a truly amazing Deep Sky Object on a par with the Pleiades and is really best viewed through binoculars so you can truly savor it’s delights. From here I moved up Orion to Collinder 69, the group of stars that form Orion’s head. This open cluster doesn’t offer the same WOW factor as Collinder 70, but it’s a beautiful little cluster all the same.

By this point the clouds over Cancer had been swept away eastwards and I could resume my search for the open cluster M67. Having found Acubens, the search for this Messier object was quite easy and in no time at all I was gazing upon this distant DSO. Now this open cluster was a lot smaller and a lot fainter, but was observable none the less.

By about 02:03 UT I decided to turn my attention to Perseus and that’s when something very bright exploded in the sky above me. This actually made me physically jump, but It lasted all of two to three seconds and was then gone. I never actually saw what is was, but I’m sure I heard a crackling or hissing sound that vanished with the light. My best guess is that it was a meteorite fireball, but I can’t be sure because I didn’t actually observe it (more’s the pity).

Feeling a little bewildered I returned to Perseus and began ambling over the constellation towards the location of NGC 1499. Gazing through the 10×50s just above Xi Persei I could make out a rich star field but unfortunately no nebulosity. To be honest I wasn’t expecting to see that much detail but it was still a worth while view.

M76 or The little Dumbbell Nebula as it is also affectionately known was the final stop on my short list and try as I might I couldn’t locate this DSO. It was only later on once I was back inside that I queried the exact location of M76 in Stellarium. I could have kicked myself, I was trying to find M76 around the locality of Tau Persei instead of Phi Persei!

Having no luck with M76 I ended my session by rambling over the north western sky. First up was the stunning Double Cluster in Perseus (NGC 869 and NGC 884) which I have neglected over the last month or so. From here I worked my way down to the beautiful and often over looked open cluster M34. Finally I let the binoculars land on the small and elusive M33 or The Triangulum Galaxy as it is also known. I always find  that this galaxy varies in brightness, something which I have put down to it’s position in my light polluted skies.

As I prepared to call time on my session I took in an unaided view of Saturn rising from the south east into the early morning sky. After spending a few moments taking in the distant but bright point of light of this planetary marvel I turned just in time to catch of small, faint meteorite pay me a ‘flying visit’ as it glanced the handle of Ursa Major and disappeared in to the east. Bidding farewell to my fleeting astral visitor I decided to wrap things up at around 02:30 UT and head indoors to warm up.

Not a Cloud in Sight

Saturday night was probably the best observing session that I have had in a while. The seeing was 5/5 while the sky transparency was in the region of 4/5, so not great. As always, my observing program begins with a look at the moons Jupiter. On show were from left to right Ganymede, Io and Europa. Callisto should have been about 8.7 arc minutes west from the centre of Jupiter. I’ve written it off as being down to light pollution and reduced sky transparency, but this is the second time I have failed to resolve Callisto through my 25×100 binoculars.

Moving on from Jupiter, I turned my attention to the constellation of Sagittarius, or what I could see of it from my position. My interest here, was to observe four Messier objects: M25, M24, M18 and M17. Using the 25×100s’ I successfully located M25, an open cluster of stars 2000 light years away from Earth. I wanted to clarify my find, so turned to my trusty 10×50s’ binoculars. The view of the cluster through the 7° FOV was a delightful sight, but I’m sure it would probably have been better in darker surroundings.

Although M24 is just west of M25, locating it proved a little more difficult. Also known as The Sagittarius Star Cloud, M24 is a pseudo cluster of stars some 600 light years wide. While I had placed the cluster It was extremely difficult to resolve it through the orange LP haze. The myriad of stars that were visible still delivered a beautiful sight all the same.

While I was searching for M24 a surprise satellite shot into my FOV. Now I don’t normally set out to track satellites, but a few have sprung up on me during my observations over the past month so I decided to do some checking up to find out which satellite this was. The Lacrosse 4 Rocket is the only one that fits in with my time frame and azimuth coordinates. As I’m not adept at tracking satellites I can’t be too sure how reliably this information compares with my observation.

Returning to my Messier search I began looking for M18, an open cluster not too far above M24 which also proved a little conspicuous. None the less, the view through my 10×50s’ was still a rewarding one. However, the real crown jewel of the evening was to be M17, The Omega Nebula.

A H II emission nebula between 5000 and 6000 light years from Earth and 15 light years in diameter, M17 is a fantastic sight. Even although it looked like a dim grey(ish) white smudge against the night sky through my 10×50s’ it is amazing to think that the gas in this nebula is around 800 solar masses.

The final Messier object on my list was M16, The Eagle Nebula. Technically, this open cluster is in the constellation Serpens, but it lies pretty close to The Omega Nebula so I thought I’d include it in my observations. Surrounded by a H II region known as IC 4703, the nebula lies a staggering 7000 light years away and is truly fantastic to behold.

Taking a much needed break I eventually moved my observations towards Cygnus and six objects, a mixture of stars and DSOs’. Deneb, NGC 7000, IC 5070, NGC 6960/6992/6995, Albireo and M56 in Lyra.

Turning the 25×100s’ on Deneb, a white super giant and one of the most luminous stars known, it was clear to see that it stood up to it’s reputation. The depth of stars that also surrounded this monster star was enumerable and breathtaking. From here I worked my way upwards towards NGC 7000 otherwise known as The North America Nebula 1.

Another emission nebula, distances to NGC 7000 are not precisely known. If Deneb is responsible for ionizing the gas in the nebula, estimates would place it at about 1800 light years away with a diameter of around 100 light years. The depth of stars in this area of the sky was unbelievable and completely blew me away, but unfortunately, due to transparency conditions I could’nt make out any nebulosity. My luck was also out with IC 5070 or The Pelican Nebula as it is better known. Disappointments aside, this is a truly brethtaking part of the sky and I felt as though I could have gazed upon it for hours.

Moving down Cygnus, my next target was The Veil Nebula i.e. NGC 6960/6992/6995. The remenants of an ancient supernova that exploded somewhere between 5000 to 8000 years ago, the nebula is all that remains. Though actual distances to this DSO are not known, estimates place the nebula between 1,400 and 2,600 light years away. I wasn’t overly optimistic that I could nail this faint DSO down, and how right I was. I quickly gave up the search here as I realized that my efforts would be fruitless.

My second last stop was the double star Albireo. At a distance of 380 light years from Earth, Albireo consists of a brighter yellow star and a faint blue companion. My 25×100s’ split the two stars reasonably well and I could pick out the contrasted colours of the two stars. From here the final stop was the globular cluster M56 in Lyra.

By this point my binoculars were beginning to fog up, suffice to say M56 remained quite elusive. Rather than continue to search through fogged up binoculars I broke out my 10×50s’ and reacquainted myself with some old friends while making a new one.

The Pleiades were quite high in the south east sky and I couldn’t resist a peek. Without waxing lyrical, this is one of the best views in the night sky and a simply stunning sight.

From here I moved on to M31, The Andromeda Galaxy and nearly broke my neck looking at it. Sitting almost at the zenith, this was probably one of the best views I have ever gotten of it through a pair of binoculars. Moving down from the constellation Andromeda, I decided to try my luck with the Triangulum Galaxy M33. I swept the sky a few times from Mirach in Andromeda to αTrianguli and that’s when it suddenly resolved right there in my binoculars like magic. A pale, distant ellipsoid lying some 2.9 million light years away.

After searching for this DSO earlier in the month, this was quite an achievement for me. Undoubtedly limited local light pollution at 02:30 UT in the morning was a big help. At this point, the cold began to set in, so I decided to content myself with my observational successes and call it a night.

  1. On an interesting note, while I was repositioning the binoculars on my way to NGC 7000, a small, faint meteorite passed through Lyra towards the north, just within my field of vision. At a guess I’d say it had an entrance and disappearance arc of maybe 20° to 30° with a small short tail.