Galaxies Astronomy Club

Hosted by Cstar1|Galaxies & More!

We keep our star talk down to earth! Beginning stargazers, professional astronomers, armchair astronauts and the cosmologically curious are all invited to join us. Galaxies Astronomy Club was founded in 1994.

  • 3531
    MEMBERS
  • 31316
    MESSAGES
  • 0
    POSTS TODAY

Discussions

New Horizons Is Awake At Pluto   The Planets + Pluto!

Started 2/26/10 by GALAXIES; 102536 views.
Cstar1
Host

From: Cstar1

7/3/15

If you get any good pictures, I hope you'll share!

Cstar1
Host

From: Cstar1

7/3/15

For some reason, I was under the impression it had plenty of fuel.

I think the article said only a few hundred feet per second remaining delta-v fuel.

Found it: "They have discovered 52 faint objects, but none that New Horizons can get to. The closest-found object, 2011 HZ102, would require New Horizons to change its speed by 210 meters per second. It has only enough fuel to achieve 130 meters per second."

130 meters per second is 5,118 inches per second velocity change. This is 426.5 feet per second, or 1,535,430 feet per hour, which is 290.8 miles per hour. While that seems fast if you're driving a dragster, for a spacecraft, that is a very small velocity change, not much more than a space shuttle de-orbit burn velocity change.

Out of more than 36,000 mph or so, this is a vector that is less than 1% from the primary trajectory.

It also looks like they are not going to do a small burn prior to the Pluto fly-by to get a gravitational assist to get more total delta-V out of the fuel that is left to target another Kupier Belt object.

At least they got a lot of Hubble time to find more objects, not sure if they actually have any candidates picked out for a close fly-by.

 

Either they were right on top of each other in an occultation, or the haze / seeing was too poor to see both Venus and Jupiter.

Just cranked up Stellarium to see what's really going on and when.

Closest conjunction was the night of June 30th. But Jupiter is magnitude -1.36, while Venus is -4.15, nearly 3 orders of magnitude brighter, so I suspect it's the haze that made Venus visible like a streetlight in fog, while Jupiter just vanished in the haze and light pollution from town off to the northwest.

 

In reply toRe: msg 55
Cstar1
Host

From: Cstar1

7/4/15

This stamp is actually flying on New Horizons to Pluto. It's from 1991, a part of the solar system set.

 

This is the proposed new stamp, but I haven't figured out yet if it ever got beyond the proposal/petition stage. 

In reply toRe: msg 56
Cstar1
Host

From: Cstar1

7/5/15

 

CDP (PerraultC)

From: CDP (PerraultC)

7/5/15

Looking forward to when they can actually make the change!

 

Cstar1
Host

From: Cstar1

7/5/15

Do you know if they actually ever released the New Horizons stamp?

CDP (PerraultC)

From: CDP (PerraultC)

7/5/15

It doesn't look like they did.

 

Too bad we can't still mail a letter for that cheap.

I remember when a first class postage was a nickel, and I have some old letters with 5 cent stamps on them. Postage has increased almost 10x since then.

 

 

 

TOP