IPB

Welcome Guest ( Log In | Register )

31 Pages V  < 1 2 3 4 > »   
Reply to this topicStart new topic
Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015
Malmer
post Mar 12 2015, 10:08 AM
Post #16


Member
***

Group: Members
Posts: 241
Joined: 22-August 05
From: Stockholm Sweden
Member No.: 468



I like these perspective jolting moments. My absolute favorite is earth and the moon seen from mercury during the lunar eclipse.
Go to the top of the page
 
+Quote Post
Habukaz
post Apr 15 2015, 11:12 AM
Post #17


Member
***

Group: Members
Posts: 415
Joined: 13-November 14
From: Norway
Member No.: 7310



Dawn is currently communicating with Earth. Here's hoping for some of spot(s) 5. smile.gif

http://eyes.nasa.gov/dsn/dsn.html


--------------------
Go to the top of the page
 
+Quote Post
JohnVV
post Apr 16 2015, 04:53 AM
Post #18


Member
***

Group: Members
Posts: 818
Joined: 18-November 08
Member No.: 4489



for those interested this is the orbit for the Dawn spacecraft as in spirals down to a lower orbit over the next few weeks



the red line is the spacecraft orbit
generated from the
dawn_ql_150219-150531_150415_v1.bsp
dawn_ref_150423-150704_150414_DA400_v1.bsp

naif kernels
Go to the top of the page
 
+Quote Post
belleraphon1
post Apr 16 2015, 07:09 PM
Post #19


Member
***

Group: Members
Posts: 810
Joined: 29-December 05
From: NE Oh, USA
Member No.: 627



Dawn Glimpses Ceres' North Pole
http://dawn.jpl.nasa.gov/news/Dawn_glimpse..._north_pole.asp
Go to the top of the page
 
+Quote Post
elakdawalla
post Apr 16 2015, 07:11 PM
Post #20


Administrator
****

Group: Admin
Posts: 5028
Joined: 4-August 05
From: Pasadena, CA, USA, Earth
Member No.: 454



JPL has released an animation of the April 10 opnavs. Very cool smile.gif



On Twitter, Brian Wolven asked me if the prominent bright peaks seen at the right-hand limb at the beginning of the animation were the two bright spots. I tried to figure out the answer to that, but couldn't. I made the attached polar projection of the northern hemisphere of the DEM from JohnVV's map, but I couldn't match crater features.
Attached thumbnail(s)
Attached Image
 


--------------------
My blog - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post
JohnVV
post Apr 16 2015, 07:31 PM
Post #21


Member
***

Group: Members
Posts: 818
Joined: 18-November 08
Member No.: 4489



it would NOT be visible YET in the April 10 images

it is at 20 deg North
what is visible in that gif is 50+ to 90 north
as you can see in these two screenshots ( if the naif kernels are accurate, i have been having MAJOR issues with some of them )
added extra light to the scene
-- FOR APRIL 10 like the gif--
near the center

- off to the right side of ceres
Go to the top of the page
 
+Quote Post
Habukaz
post Apr 16 2015, 07:36 PM
Post #22


Member
***

Group: Members
Posts: 415
Joined: 13-November 14
From: Norway
Member No.: 7310



Pleasantly surprised to see that OpNav 6 was released today. Something odd happens when I try to extract the individual frames with IrfanView, though: the frames come out in all sorts of sizes. blink.gif (edit: never mind, Python to the rescue)

In the latest Dawn Journal, it was mentioned that spot(s) 5 would not be visible in OpNav 6:

QUOTE
As we describe below, Dawn’s extensive photographic coverage of the sunlit terrain in early May will include these bright spots. They will not be in view, however, when Dawn spies the thin crescent of Ceres in its next optical navigation session, scheduled for April 10


so I think it would be odd if they suddenly turned up anyway.


--------------------
Go to the top of the page
 
+Quote Post
elakdawalla
post Apr 16 2015, 07:37 PM
Post #23


Administrator
****

Group: Admin
Posts: 5028
Joined: 4-August 05
From: Pasadena, CA, USA, Earth
Member No.: 454



QUOTE (JohnVV @ Apr 16 2015, 12:31 PM) *
it would NOT be visible YET

Thanks for those simulations, they are really helpful.


--------------------
My blog - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post
JohnVV
post Apr 16 2015, 08:12 PM
Post #24


Member
***

Group: Members
Posts: 818
Joined: 18-November 08
Member No.: 4489



in the northpole image you posted the two side by side bright spots are the line here circled


and it will be visible TODAY but not much better than before. just from a different angle
Go to the top of the page
 
+Quote Post
Gladstoner
post Apr 16 2015, 09:18 PM
Post #25


Member
***

Group: Members
Posts: 646
Joined: 3-January 08
Member No.: 3995



I think this mound (or mounds) in the large crater is a good candidate for the limb peaks:

Attached Image

Note the trio of craters circled in red:


Attached Image


They seem to correspond with the craters in red here:

Attached Image


Now extend a longitudinal line over the north pole here:

Attached Image


And here (north pole marked with 'N'):

Attached Image


The peaks are to the east of the line. The crater with the mound(s) is marked with a yellow box on the longitudinal map.
Go to the top of the page
 
+Quote Post
Gerald
post Apr 17 2015, 04:14 AM
Post #26


Senior Member
****

Group: Members
Posts: 1840
Joined: 7-December 12
Member No.: 6780



With the following assumed globes for PIA19317.gif OpNav6

I've obtained these projections:

Addition of the projections to the DLR map from RC2:


The bright spot is probably just outside frame 20 of the sequence.
Go to the top of the page
 
+Quote Post
JohnVV
post Apr 17 2015, 05:56 AM
Post #27


Member
***

Group: Members
Posts: 818
Joined: 18-November 08
Member No.: 4489



aligning the animated gif with the textured mesh and lat long marks

the other "bright spot" is at 42 N and 0 long.
it is barely visible in the gif
3 frames from the gif with and without a spherical grid
the 0/360 long is top right on the sphere and you can see the major bright spot

hidden under the horizon

almost visible on the top left
Go to the top of the page
 
+Quote Post
Toma B
post Apr 17 2015, 08:20 AM
Post #28


Member
***

Group: Members
Posts: 625
Joined: 9-May 05
From: Subotica
Member No.: 384



Ceres rotating back and forth in latest images from Dawn spacecraft.
I find it much easier to spot different surface details this way.

Attached Image


--------------------
The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.
Jules H. Poincare

My "Astrophotos" gallery on flickr...
Go to the top of the page
 
+Quote Post
TheAnt
post Apr 17 2015, 10:44 AM
Post #29


Member
***

Group: Members
Posts: 474
Joined: 12-February 12
Member No.: 6336



QUOTE (Toma B @ Apr 17 2015, 10:20 AM) *
I find it much easier to spot different surface details this way.


Thank you for your effort Toma. Now this make me think the surface resemble a golf ball. =)
Go to the top of the page
 
+Quote Post
mcgyver
post Apr 17 2015, 05:26 PM
Post #30


Member
***

Group: Members
Posts: 107
Joined: 1-August 14
Member No.: 7227



QUOTE (Toma B @ Apr 17 2015, 08:20 AM) *
Ceres rotating back and forth in latest images from Dawn spacecraft.
I find it much easier to spot different surface details this way.


I can't figure out if bright spot is visible in the animation.
I place here the other available images for more comfortable comparisons:
http://cdn.phys.org/newman/csz/news/800/20...warfplanetc.jpg
http://cdn.phys.org/newman/csz/news/800/20...hisimageist.jpg
https://lightsinthedark.files.wordpress.com...3/pia189231.jpg
http://www.jpl.nasa.gov/spaceimages/images...19056_hires.jpg


I don't understand if I must link them or upload them or insert them in tag so I just add the links.
Go to the top of the page
 
+Quote Post

31 Pages V  < 1 2 3 4 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 23rd July 2017 - 08:56 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.