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Citizen "Ice Hunters" help find a Neptune Trojan target for New Horizons

Posted by Alex Parker on 2012/10/09 12:15 CDT | 1 comments

2011 HM102 is an L5 Neptune Trojan, trailing Neptune by approximately 60 degrees. This object was discovered in the search for a New Horizons post-Pluto encounter object in the Kuiper Belt.

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A fifth moon for Pluto, and a possible hazard for New Horizons

Posted by Emily Lakdawalla on 2012/07/16 02:55 CDT | 9 comments

Pluto is now known to have at least five moons (Charon, Nix, Hydra, P4, and the newly discovered P5), and its burgeoning population might pose a risk to New Horizons during its flyby, three years from now.

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Salacia: As big as Ceres, but much farther away

Posted by Emily Lakdawalla on 2012/06/26 12:27 CDT | 10 comments

A newly published paper shows trans-Neptunian object Salacia to be unexpectedly large; it's somewhere around the tenth largest known thing beyond Neptune. It has a companion one-third its size, making it appear similar to Orcus and Vanth.

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What Saturn's moons can tell us about comets (Notes from LPSC 2012)

Posted by Emily Lakdawalla on 2012/04/03 05:20 CDT

My notes on a two-part presentation by collaborators Jim Richardson and David Minton about the sizes of things in the Kuiper belt, a story they told by looking at Saturn's moons. How does that work? What connects Saturn's moons to the Kuiper belt is craters.

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Where are the big Kuiper belt objects?

Posted by Emily Lakdawalla on 2012/02/16 05:35 CST | 8 comments

Earlier today I wrote a post about how to calculate the position of a body in space from its orbital elements. I'm trying to get a big-picture view of what's going on in trans-Neptunian space.

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Scale solar system presentation slide, a provisional version for you to review

Posted by Emily Lakdawalla on 2011/09/15 02:18 CDT

I'm preparing a talk for the Pacific Astronomy and Telescope Show here in Pasadena on Sunday afternoon at 1:45. I have spent the morning putting together a slide that I have long wanted to have for presentations.

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Meeting today: The infelicitously named "SBAG"

Posted by Emily Lakdawalla on 2011/08/25 01:45 CDT

NASA funds regular meetings of scientists who work on different parts of the solar system to provide scientific input into NASA's future plans. These "analysis groups" are known by their acronyms, all of which sound kind of horrible, but none has quite as terrible-sounding an acronym as "SBAG," usually pronouced "ess-bag," the Small Bodies Assessment Group.

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Observing at the WIYN

Posted by Meg Schwamb on 2011/06/08 02:43 CDT

On May 5 and 6, I had a run on the WIYN (Wisconsin-Indiana-Yale-NOAO) telescope, a 3.5 m telescope, the second largest telescope on Kitt Peak in Arizona.

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South of the Border

Posted by Meg Schwamb on 2011/05/25 08:30 CDT

The last decade has seen an explosion in our understanding of the solar system with the discovery of the largest Kuiper belt objects (KBOs) of comparable size to Pluto.

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LPSC 2011: Day 1: Small bodies

Posted by Emily Lakdawalla on 2011/03/08 12:28 CST

Here are some of the noteworthy items from the morning's session on "Small Bodies: A Traverse from NEOs to TNOs" and the afternoon's session on "Asteroid Geophysics and Processes: Surfaces and Interiors."

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Report from the 2011 New Horizons Science Team Meeting

Posted by Ted Stryk on 2011/01/24 01:01 CST

The annual New Horizons Science Team Meeting was held last week at NASA's Ames Research Center.

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Orcus and Vanth

Posted by Emily Lakdawalla on 2011/01/11 01:49 CST | 1 comments

As part of a big, ongoing project to make a comparison chart of the dimensions and physical properties of solar system objects I've spent the morning tackling the difficult problem of summarizing the physical characteristics of the biggest things that are out there beyond Neptune.

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New maps of Pluto show pretty amazing amounts of surface change

Posted by Emily Lakdawalla on 2010/02/04 02:17 CST

I just posted my writeup of today's press briefing on a new map of Pluto produced from Hubble images. The main conclusion was that Pluto has shown an astonishing amount of changes across its surface between 1994 and 2002 -- more, in fact, than any other solid surface in the solar system.

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Ted Stryk: Report from New Horizons science team meeting

Posted by Ted Stryk on 2010/01/19 07:55 CST

The New Horizons science team is meeting this week. Ted Stryk was invited to attend the meeting, and he sent the following notes from the first day.

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LPSC: Thursday: Rovers, Titan, Mars, Venus Express, Neptune

Posted by Ted Stryk on 2008/03/14 03:49 CDT

I spent a large portion of the day at the Lunar and Planetary Institute's library and presented my own poster during the poster sessions, so my coverage of Thursday's sessions is limited.

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(Almost) everything you ever wanted to know about New Horizons and Pluto

Posted by Emily Lakdawalla on 2005/12/20 05:56 CST

I was browsing around the Web today looking for material to improve the information we have on our site about Pluto, and discovered that the New Horizons mission has just posted their launch press kit.

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An official pronouncement may be coming about the "what is a planet?" debate

Posted by Emily Lakdawalla on 2005/09/21 02:28 CDT

Since the discovery of 2003 UB313, larger than Pluto, there's been a lively debate going on in many places about what makes a planet. There's now an article in Nature talking about a proposal that would address the controversy

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Pluto: The Discovery of a Planet

Posted by Amir Alexander on 2005/02/18 11:00 CST

To mark the 75th anniversary of the discovery of the planet Pluto, The Planetary Society presents to its readers the remarkable story of the discovery.

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The Discovery of a Planet, Part 6: From Pluto to Sedna

Posted by Amir Alexander on 2005/02/17 11:00 CST

74 years after Clyde Tombaugh discovered Pluto as a faint dot on a pair of photographic plates, a modern group of astronomers made another remarkable discovery. On March 15, 2004, Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale announced the discovery of Sedna – the furthest object ever detected in the Solar System.

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