APOD: Dim World, Dark Nebula (2010 Jul 08)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 5319
Joined: Fri Dec 04, 2009 3:27 am

APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by APOD Robot » Thu Jul 08, 2010 4:10 am

Image Dim World, Dark Nebula

Explanation: Dim, distant, dwarf planet Pluto can be hard to spot, especially in recent months as it wanders through the crowded starfields of Sagittarius and the central Milky Way. But fortunately for backyard Pluto hunters, it crossed in front of a dark nebula in early July. The diminutive world is marked with two short lines near the center of this skyscape recorded from New Mexico Skies on July 5. Pluto stands out only because obscuring dark nebula Barnard 92 (B92) blocks the background of the Milky Way's congeries of faint, innumerable stars. Another of astronomer E. E. Barnard's cataloged dark markings on the sky, B93, is easy to pick out just left of B92. Prominent at the lower left is open star cluster NGC 6603. In fact, Pluto, dark nebulae, and star cluster all lie within a portion of M24, also known as the Sagittarius Star Cloud, filling most of the frame.

<< Previous APODDiscuss Any APOD Next APOD >>
[/b]


phytophan

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by phytophan » Thu Jul 08, 2010 4:19 am

interesting to see how dim our companions can be, but what is the bright object slightly above and left of pluto that is also between us and B92 ?

User avatar
owlice
Guardian of the Codes
Posts: 8406
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by owlice » Thu Jul 08, 2010 4:33 am

A closed mouth gathers no foot.

User avatar
Chris Peterson
Abominable Snowman
Posts: 18053
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by Chris Peterson » Thu Jul 08, 2010 4:41 am

phytophan wrote:interesting to see how dim our companions can be, but what is the bright object slightly above and left of pluto that is also between us and B92 ?
It's a star, HD 312872. This star has a parallax of 4.1 mas, so it is about 800 ly distant, as compared to 10,000 ly for the dark nebula.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com

Guest

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by Guest » Thu Jul 08, 2010 4:51 am

Cool picture :)
How long does it take Pluto to go around the sun?


-H-

User avatar
bystander
Apathetic Retiree
Posts: 21570
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by bystander » Thu Jul 08, 2010 6:01 am

Guest wrote:How long does it take Pluto to go around the sun?-
90,613.3 days
248.1 years

workgazer

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by workgazer » Thu Jul 08, 2010 9:36 am

and only 20 days holidays in a plutoian working year :-( they need a better union

User avatar
orin stepanek
Plutopian
Posts: 8200
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by orin stepanek » Thu Jul 08, 2010 12:49 pm

Pluto pictures. http://space.about.com/od/solarsystem/i ... s-Gallery/
I hope New Horizons gets some good pictures of this outpost of the Solar System! :)
Orin

Smile today; tomorrow's another day!

Guest

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by Guest » Thu Jul 08, 2010 1:19 pm

workgazer wrote:and only 20 days holidays in a plutoian working year :-( they need a better union
lol :D

León
Science Officer
Posts: 120
Joined: Wed Jun 02, 2010 12:52 pm
AKA: Levon
Location: La Falda-Córdoba-Argentina

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by León » Thu Jul 08, 2010 1:25 pm

The dark world which passes the god of the underworld, the question arises, how will dwarf in the nebula, between subjects, shadows, miserable shattered parts of ancient gods transformed into dark powder.

User avatar
bystander
Apathetic Retiree
Posts: 21570
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by bystander » Thu Jul 08, 2010 2:03 pm

workgazer wrote:and only 20 days holidays in a plutoian working year :-( they need a better union
It's not quite as bad as it first looks, it's only 14,164.4 Pluto solar days :wink:
(one solar day on Pluto is almost a week long (6 days, 9 hr, 17 min)).
Look at all the free time you would have each 8 hour working day.

moonstruck
Science Officer
Posts: 164
Joined: Fri Jun 18, 2010 2:27 pm

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by moonstruck » Thu Jul 08, 2010 3:35 pm

It's amazing how far astronomy has come. I bought a pretty good telescope when I was younger and about all I could ever find was Saturn and Jupitor and maybe Mars and that would be on a lucky night. :| If I brought friends over I couldn't even do that half the time. In fact back then I don't think they even knew about Pluto and if we did we couldn't have found it. Way to go you professional type guys.

León
Science Officer
Posts: 120
Joined: Wed Jun 02, 2010 12:52 pm
AKA: Levon
Location: La Falda-Córdoba-Argentina

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by León » Thu Jul 08, 2010 4:28 pm

New Horizons is a NASA robotic spacecraft mission currently en route to the dwarf planet Pluto. It is expected to be the first spacecraft to fly by and study Pluto and its moons, Charon, Nix, and Hydra. NASA may also approve flybys of one or more other Kuiper Belt Objects.

New Horizons was launched on January 19, 2006 directly into an Earth-and-solar-escape trajectory. It had an Earth-relative velocity of about 16.26 km/s or 58,536 km/h (10.10 mi/s or 36,373 mi/h) after its last engine shut down. Thus, it left Earth at the fastest launch speed ever recorded for a man-made object. It flew by Jupiter on February 28, 2007 at 5:43:40 UTC and Saturn's orbit on June 8, 2008 at 10:00 UTC. It will arrive at Pluto on July 14, 2015 and then continue into the Kuiper belt. http://en.wikipedia.org/wiki/New_Horizons

User avatar
bystander
Apathetic Retiree
Posts: 21570
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by bystander » Thu Jul 08, 2010 4:56 pm


biddie67
Science Officer
Posts: 483
Joined: Sun Jan 31, 2010 9:44 am
Location: Possum Hollow, NW Florida

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by biddie67 » Thu Jul 08, 2010 6:28 pm

I am constantly amazed at the determination that the astrophotographers have to be able to pick out such a small object from the astounding myriad of objects around it - congratulations to you Ray Gralak!!!!

What also amazes me is that predictions of where to find Pluto like this can be so accurate.

The the length of Pluto's "day" is fascinating - I've often wished that our day was about 3-4 hours longer than it is - that would match my own internal clock better than the 24 hour day that I (we all) must live with! But Pluto's day would definitely be too much!!!

User avatar
orin stepanek
Plutopian
Posts: 8200
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by orin stepanek » Thu Jul 08, 2010 10:58 pm

The the length of Pluto's "day" is fascinating - I've often wished that our day was about 3-4 hours longer than it is - that would match my own internal clock better than the 24 hour day that I (we all) must live with! But Pluto's day would definitely be too much!!!
Maybe it's my age; but as tired as I get I don't think I could take a day longer than 24 hours. :wink:
Orin

Smile today; tomorrow's another day!

Wolf Kotenberg

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by Wolf Kotenberg » Fri Jul 09, 2010 3:05 am

Isaw no bulges so Charon must be in line of sight or behind. I made the image as big as my image software wouldlet me.You know what would be cool ? next planetary mission,put a laser generator on the machine and see if telescopes van follow the voyages.

User avatar
Chris Peterson
Abominable Snowman
Posts: 18053
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by Chris Peterson » Fri Jul 09, 2010 3:26 am

Wolf Kotenberg wrote:Isaw no bulges so Charon must be in line of sight or behind. I made the image as big as my image software wouldlet me.
At maximum separation, Pluto and Charon are only about 0.9 arcseconds apart. That is probably below the resolution limits of the optics and seeing conditions. In any case, this is a wide field image, with a plate scale (on the large image) of about 4 arcseconds per pixel. So Pluto and Charon together will always be seen as a point source, without the slightest hint of a bulge.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by DavidLeodis » Fri Jul 09, 2010 12:26 pm

I learnt a new word from the explanation, "congeries" that was used in "the Milky Way's congeries". My dictionary defines congeries as "a disorderly collection; a mass or heap" and is used as a singular and plural noun. Not sure if I should be :oops: or not for not knowing the word. :)

User avatar
owlice
Guardian of the Codes
Posts: 8406
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by owlice » Fri Jul 09, 2010 12:36 pm

David, one of the many things I love about APOD is that it expands my vocabulary. I love finding new-to-me words in APOD text.
A closed mouth gathers no foot.

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by DavidLeodis » Fri Jul 09, 2010 1:09 pm

owlice wrote:David, one of the many things I love about APOD is that it expands my vocabulary. I love finding new-to-me words in APOD text.
I wonder if we APODers are mostly considered to be an orderly lot or a disorderly lot hence a congeries of APODers. :wink: Hopefully the former! :)

User avatar
owlice
Guardian of the Codes
Posts: 8406
Joined: Wed Aug 04, 2004 4:18 pm
Location: Washington, DC

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by owlice » Fri Jul 09, 2010 1:30 pm

Wouldn't the latter be much more fun, though??

:: sits on the congeries bench ::

:: hopes others will join her ::

:-D
A closed mouth gathers no foot.

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Dim World, Dark Nebula (2010 Jul 08)

Post by DavidLeodis » Fri Jul 09, 2010 1:32 pm

owlice wrote:Wouldn't the latter be much more fun, though??

:: sits on the congeries bench ::

:: hopes others will join her ::

:-D
:lol: