APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3301
Joined: Fri Dec 04, 2009 3:27 am

APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by APOD Robot » Wed Aug 15, 2018 4:06 am

Image Launch of the Parker Solar Probe

Explanation: When is the best time to launch a probe to the Sun? The now historic answer -- which is not a joke because this really happened this past weekend -- was at night. Night, not only because NASA's Parker Solar Probe's (PSP) launch window to its planned orbit occurred, in part, at night, but also because most PSP instruments will operate in the shadow of its shield -- in effect creating its own perpetual night near the Sun. Before then, years will pass as the PSP sheds enough orbital energy to approach the Sun, swinging past Venus seven times. Eventually, the PSP is scheduled to pass dangerously close to the Sun, within 9 solar radii, the closest ever. This close, the temperature will be 1,400 degrees Celsius on the day side of the PSP's Sun shield -- hot enough to melt many forms of glass. On the night side, though, it will be near room temperature. A major goal of the PSP's mission to the Sun is to increase humanity's understanding of the Sun's explosions that impact Earth's satellites and power grids. Pictured is the night launch of the PSP aboard the United Launch Alliances' Delta IV Heavy rocket early Sunday morning.

<< Previous APOD This Day in APOD Next APOD >>

Boomer12k
:---[===] *
Posts: 2310
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by Boomer12k » Wed Aug 15, 2018 7:59 am

Go, Baby, Go!!!!

:---[===] *

User avatar
Fred the Cat
Theoretic Apothekitty
Posts: 456
Joined: Mon Feb 22, 2016 4:09 pm
AKA: Ron
Location: Eagle, Idaho

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by Fred the Cat » Wed Aug 15, 2018 3:53 pm

It's the photographer that needed a shield. Let alone his camera. :wink: Sure his aperture was only open a whisper. 8-)
Freddy's Felicity "Only ascertain as a cat box survivor"

suicidejunkie
Ensign
Posts: 29
Joined: Wed Oct 21, 2015 6:46 pm

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by suicidejunkie » Wed Aug 15, 2018 5:32 pm

I like to use that same angle for launching from KSC. The ship looks awfully familiar too. I gotta get a high rez texture mod like this image.
Good to see they added the extra boosters and struts too :D

Uwe

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by Uwe » Wed Aug 15, 2018 8:51 pm

Of course the best time to launch a probe to the sun is .. on a sunday :D

User avatar
MarkBour
Subtle Signal
Posts: 727
Joined: Mon Aug 26, 2013 2:44 pm
Location: Illinois, USA

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by MarkBour » Mon Aug 27, 2018 11:33 pm

Since we have not sent anything that close to the Sun before, I wonder a little if they are right about the temperature that the shielded part will experience. I'm sure they've modeled it based on the knowledge we already have of the solar wind and corona. I hope it goes smoothly and gathers lots of interesting data.
Mark Goldfain

User avatar
neufer
Vacationer at Tralfamadore
Posts: 15288
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by neufer » Tue Aug 28, 2018 12:30 am

MarkBour wrote:
Mon Aug 27, 2018 11:33 pm

Since we have not sent anything that close to the Sun before,
I wonder a little if they are right about the temperature that the shielded part will experience.
Black Body radiation is pretty well understood.

Parker Solar Probe shield Temp. = 0.89 x [Photosphere Temp.: 5,772 K) / sqrt(distance in R)]
Last edited by neufer on Tue Aug 28, 2018 7:53 pm, edited 1 time in total.
Art Neuendorffer

User avatar
MarkBour
Subtle Signal
Posts: 727
Joined: Mon Aug 26, 2013 2:44 pm
Location: Illinois, USA

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by MarkBour » Tue Aug 28, 2018 5:40 pm

neufer wrote:
Tue Aug 28, 2018 12:30 am
MarkBour wrote:
Mon Aug 27, 2018 11:33 pm

Since we have not sent anything that close to the Sun before,
I wonder a little if they are right about the temperature that the shielded part will experience.
Black Body radiation is pretty well understood.

Parker Solar Probe shield Temp. = 0.89 x (Photosphere Temp.: 5,772 K) / sqrt(distance in R)
But the Parker Solar Probe will get into the corona, right?
The gases therein are evidently not heated by blackbody radiation.
Helping figure out how that works is why it is being sent there ...
Mark Goldfain

User avatar
Chris Peterson
Abominable Snowman
Posts: 13927
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Launch of the Parker Solar Probe (2018 Aug 15)

Post by Chris Peterson » Tue Aug 28, 2018 7:24 pm

MarkBour wrote:
Tue Aug 28, 2018 5:40 pm
neufer wrote:
Tue Aug 28, 2018 12:30 am
MarkBour wrote:
Mon Aug 27, 2018 11:33 pm

Since we have not sent anything that close to the Sun before,
I wonder a little if they are right about the temperature that the shielded part will experience.
Black Body radiation is pretty well understood.

Parker Solar Probe shield Temp. = 0.89 x (Photosphere Temp.: 5,772 K) / sqrt(distance in R)
But the Parker Solar Probe will get into the corona, right?
The gases therein are evidently not heated by blackbody radiation.
Helping figure out how that works is why it is being sent there ...
The corona is "hot" in the same way that the Earth's thermosphere is. That's where the ISS orbits, and the temperature is over 2000° C. The ISS does not need a heat shield. The corona where the Parker probe will dip has a density of around 109 particles per cubic centimeter. That's a pretty good vacuum. What that means is that very little heat is transferred. "Hot" means very energetic particles as well as x-ray emission. That's what they had to be concerned about. The heat shield protects the probe from ordinary solar radiation. Other measures are used to protect from radiation and energetic plasma in the corona itself.
Chris

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