Re: Rosetta Mission thread
Rosetta captures some nice imagery of weather patterns over the South Pacific.
Andrew Brown.
Rosetta captures some nice imagery of weather patterns over the South Pacific.
Andrew Brown.
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Re: Rosetta Mission thread
*drools*
Those are fantastic images. Our little blue marble is a very photogenic place, isn't it?
*drools*
Those are fantastic images. Our little blue marble is a very photogenic place, isn't it?
Re: Rosetta Mission thread
or at least they mostly hide from natives ..
Interesting tour has this bird. We will know a bit more about a composition of NEO s, for one.
Not much talk about 21 Lutetia on ESA site, i wanted to know how close will it get.
Yea and not crowded by touristsCalliArcale":2c0wtt6d said:
or at least they mostly hide from natives ..Interesting tour has this bird. We will know a bit more about a composition of NEO s, for one.
Not much talk about 21 Lutetia on ESA site, i wanted to know how close will it get.
Re: Rosetta Mission thread
Rosetta images the Moon.
Rosetta will pass the Main Belt Asteroid 21 Lutetia at a distance of approx 3,000 KM. It may be reduced slightly. The OSIRIS Narrow Angle Camera will hopefully take high res mosaics of the large Type M asteroid. The OSIRIS Wide Angle Camera will take colour mugshots.
Andrew Brown.
Rosetta images the Moon.
Rosetta will pass the Main Belt Asteroid 21 Lutetia at a distance of approx 3,000 KM. It may be reduced slightly. The OSIRIS Narrow Angle Camera will hopefully take high res mosaics of the large Type M asteroid. The OSIRIS Wide Angle Camera will take colour mugshots.
Andrew Brown.
Re: Updates on Asteroid 2867 Šteins.
Emily Lakdawalla has come up trumps again with this fascinating update concerning Asteroid 2867 Šteins.
Planetary Society 2867 Šteins update.
ESA 2867 Šteins update.
Below interesting catanae spotted on both sides of 2867 Šteins. Seven depressions were seen sell during the pass on the side Rosetta saw at closest approach, but during approach, another linear depression was seen on the other side.
My own enlarged sharpened crop of the top left panel.
2867 Šteins rotates in a retrograde direction, i.e from east to west, so on 2867 Šteins, the sun rises in the west & sets in the east. ESA decided that because of this the 'large' 2.1 KM wide crater at the top is at the South Pole of 2867 Šteins, even though it is facing north.
Andrew Brown.
Emily Lakdawalla has come up trumps again with this fascinating update concerning Asteroid 2867 Šteins.
Planetary Society 2867 Šteins update.
ESA 2867 Šteins update.
Below interesting catanae spotted on both sides of 2867 Šteins. Seven depressions were seen sell during the pass on the side Rosetta saw at closest approach, but during approach, another linear depression was seen on the other side.
My own enlarged sharpened crop of the top left panel.
2867 Šteins rotates in a retrograde direction, i.e from east to west, so on 2867 Šteins, the sun rises in the west & sets in the east. ESA decided that because of this the 'large' 2.1 KM wide crater at the top is at the South Pole of 2867 Šteins, even though it is facing north.
Andrew Brown.
Re: Updates on Asteroid 2867 Šteins.
The reason for the reversed north and south pole is that technically because of the retrograde rotation, the south pole is called north. It's standard IAU nomenclature so that the Lat/Long system on all bodies is consistant
The reason for the reversed north and south pole is that technically because of the retrograde rotation, the south pole is called north. It's standard IAU nomenclature so that the Lat/Long system on all bodies is consistant
Re: Updates on Asteroid 2867 Šteins.
Thanks Wayne, coming to think of it, I had come across this before as technically, Uranus, Pluto, Venus, 243 Ida & 2867 Šteins are all retrograde rotators & the axial tilts are all given in excess of 90 degrees (with Uranus & Venus anyway), so therefore south would be north so to speak.
I had a go at sharpening up the opposing catenae on 2867 Šteins. I wonder if that is a weakness that goes right through the asteroid? Looks like craters on one side, but a linear depression on the other.
Andrew Brown.
Thanks Wayne, coming to think of it, I had come across this before as technically, Uranus, Pluto, Venus, 243 Ida & 2867 Šteins are all retrograde rotators & the axial tilts are all given in excess of 90 degrees (with Uranus & Venus anyway), so therefore south would be north so to speak.
I had a go at sharpening up the opposing catenae on 2867 Šteins. I wonder if that is a weakness that goes right through the asteroid? Looks like craters on one side, but a linear depression on the other.
Andrew Brown.
Asteroid 21 Lutetia (ESA Rosetta Encounter).
Whilst this is very early, the ESA Comet 67P/Churyumov-Gerasimenko bound Rosetta spacecraft will encounter the large main belt Asteroid 21 Lutetia.
The 3,000 KM pass of this 135 KM wide asteroid (a little larger than previously thought based on recent observations)will take place on: Saturday 10th July 2010.
However, Emily Lakdawalla has written a fascinating article, about what is know to date about this enigmatic large asteroid.
Asteroid 21 Lutetia article.
Abstract from Arvix..
It as fascinating read. Apparently owing to light curves, there is evidence of a huge impact crater on the asteroid & the surface is spectrally homogenous, i.e it hardly varies in composition.
I have posted a question regarding what season 21 Lutetia will be in when Rosetta passes by, owing to 21 Lutetia's 85 degree axial tilt. North polar star of 21 Lutetia is thought to be Theta Virginis, some 10 degrees north of Spica / Alpha Virginis. I hope it's near an equinox.
If so we should see near enough of the entire asteroid during the approach as 21 Lutetia rotates in front of the approaching Rosetta. If near a Solstice, we will see only just over half, as most of the same 'hemisphere' will be in sunlight. Either way, this will still be awesome & by far the largest asteroid seen close up, until DAWN arrives at 4 Vesta in August 2011.
I think this asteroid will turn out to be more interesting then the target comet IMO.
Andrew Brown.
Whilst this is very early, the ESA Comet 67P/Churyumov-Gerasimenko bound Rosetta spacecraft will encounter the large main belt Asteroid 21 Lutetia.
The 3,000 KM pass of this 135 KM wide asteroid (a little larger than previously thought based on recent observations)will take place on: Saturday 10th July 2010.
However, Emily Lakdawalla has written a fascinating article, about what is know to date about this enigmatic large asteroid.
Asteroid 21 Lutetia article.
Abstract from Arvix..
It as fascinating read. Apparently owing to light curves, there is evidence of a huge impact crater on the asteroid & the surface is spectrally homogenous, i.e it hardly varies in composition.
I have posted a question regarding what season 21 Lutetia will be in when Rosetta passes by, owing to 21 Lutetia's 85 degree axial tilt. North polar star of 21 Lutetia is thought to be Theta Virginis, some 10 degrees north of Spica / Alpha Virginis. I hope it's near an equinox.
If so we should see near enough of the entire asteroid during the approach as 21 Lutetia rotates in front of the approaching Rosetta. If near a Solstice, we will see only just over half, as most of the same 'hemisphere' will be in sunlight. Either way, this will still be awesome & by far the largest asteroid seen close up, until DAWN arrives at 4 Vesta in August 2011.
I think this asteroid will turn out to be more interesting then the target comet IMO.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Wiki : 21 Lutetia ( a lot of links )
Nice picture, not completely related, i dl-ed it anyway :
Where does Steins fit in?
Wiki : 21 Lutetia ( a lot of links )
Nice picture, not completely related, i dl-ed it anyway :
Where does Steins fit in?
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
ESA Blog opened on the very exciting upcoming 21 Lutetia encounter on: Saturday 10th July 2010 @ 15:44 HRS UTC.
Andrew Brown.
ESA Blog opened on the very exciting upcoming 21 Lutetia encounter on: Saturday 10th July 2010 @ 15:44 HRS UTC.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
I find this interesting, among other :
From http://en.wikipedia.org/wiki/21_Lutetia
http://en.wikipedia.org/wiki/Hydrate
I could also add
Wiki : Rosetta (spacecraft)
I find this interesting, among other :
From http://en.wikipedia.org/wiki/21_Lutetia
http://en.wikipedia.org/wiki/Hydrate
I could also add
Wiki : Rosetta (spacecraft)
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Thanks EarthlingX.
It is a strange one, 21 Lutetia displays mostly a Carbon rich (Type C) surface with a little Metallic (Type M) signature. On the face of it, it may seem the type M category is incorrect. However, it is still too soon to know for sure. Gravity data will help, the close up images & spectra will also help, as a metallic rich surface will behave differently to a carbon rich one to impacts & a metallic rich asteroid may look more angular than a type C or S one will.
Below 21 Lutetia as imaged by Rosetta from afar on: Monday 31st May 2010.
21 Lutetia, it is a composite frame from both navigation cameras A & B. Camera A took a longer exposure than B.
Rosetta makes small course adjustment burn to optimise for 21 Lutetia pass.
Andrew Brown.
Thanks EarthlingX.
It is a strange one, 21 Lutetia displays mostly a Carbon rich (Type C) surface with a little Metallic (Type M) signature. On the face of it, it may seem the type M category is incorrect. However, it is still too soon to know for sure. Gravity data will help, the close up images & spectra will also help, as a metallic rich surface will behave differently to a carbon rich one to impacts & a metallic rich asteroid may look more angular than a type C or S one will.
Below 21 Lutetia as imaged by Rosetta from afar on: Monday 31st May 2010.
21 Lutetia, it is a composite frame from both navigation cameras A & B. Camera A took a longer exposure than B.
Rosetta makes small course adjustment burn to optimise for 21 Lutetia pass.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Latest update concerning the 21 Lutetia pass.
Current anticipated pass: 3,169 KM / 1,968 miles from the 132 KM by 95 KM (82 by 59 miles) sized Main Belt Asteroid 21 Lutetia at a predicted time of 15:44:55 UTC / GMT. 16:44:55 CET / BST. 10:44:55 EDT on: Saturday 10th July 2010.
Andrew Brown.
Latest update concerning the 21 Lutetia pass.
Current anticipated pass: 3,169 KM / 1,968 miles from the 132 KM by 95 KM (82 by 59 miles) sized Main Belt Asteroid 21 Lutetia at a predicted time of 15:44:55 UTC / GMT. 16:44:55 CET / BST. 10:44:55 EDT on: Saturday 10th July 2010.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
http://www.esa.int : Call for Media: Rosetta flyby of asteroid Lutetia on 10 July
http://www.esa.int : Call for Media: Rosetta flyby of asteroid Lutetia on 10 July
30 June 2010
ESA PR-14 2010: The media are invited to ESA’s Space Operations Centre in Darmstadt, Germany to follow Rosetta’s encounter with asteroid Lutetia on 10 July, 18:00–23:00. The first images of the asteroid will be released before midnight, with experts available for interview.
ESA’s Rosetta comet-chaser is en route to its main target, comet 67P/ Churyumov-Gerasimenko, arriving in 2014. On Saturday, 10 July it will fly past the previously unvisited asteroid Lutetia.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
"At closest approach, Rosetta will be travelling past Lutetia at 15 kilometres per second – or 54,000 kilometres per hour. This is comparable to sending a radio-controlled car down an autobahn at roughly 100 kilometres per hour to take pictures of a stationary object it passes in the next lane (just about six metres away), with the ex.......
Latest update on the 21 Lutetia pass.
Andrew Brown.
"At closest approach, Rosetta will be travelling past Lutetia at 15 kilometres per second – or 54,000 kilometres per hour. This is comparable to sending a radio-controlled car down an autobahn at roughly 100 kilometres per hour to take pictures of a stationary object it passes in the next lane (just about six metres away), with the ex.......
Latest update on the 21 Lutetia pass.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
webservices.esa.int : Timeline for Lutetia flyby 9-10 July 2010
webservices.esa.int : Rosetta right on target for Lutetia flyby
webservices.esa.int : Timeline for Lutetia flyby 9-10 July 2010
07 July, 2010 11:02
We've put together a simplified timeline showing some of the more interesting and critical events that are happening this week and on 'F-Day' - 10 July, when Rosetta makes closest approach to Lutetia.
Highlights include: ground stations passes using ESA and NASA deep-space antennas, Rosetta's famous 'flip' into its upside-down orientation for flyby mid-day on Saturday, loss and acquisition of signal and the start/pause/stop of the webcast live from ESA/ESOC.
Access the detailed timeline below under 'full story' -- Daniel
webservices.esa.int : Rosetta right on target for Lutetia flyby
07 July, 2010 16:27
Rosetta Spacecraft Operations Manager Andrea Accomazzo has just sent a note to update us on the latest orbit determination done by ESA's Flight Dynamics specialists supporting the flyby. He writes:
Basically, this news means that Rosetta is lined up on the correct trajectory to bring her to the desired fly-by point on 10 July.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Thank you very much EarthlingX for that timeline.
It looks like the images will start becoming available from 21:00 HRS UTC / 22:00 CET (BST) / 23:00 SCET.
I intend to watch the release live & will throw images up here on SDC as they become available. I will post enhanced, enlarged crops, etc later on.
Below. Asteroid 21 Lutetia (dead centre) from 5.8 million KM, through NavCam A approx 11:00 HRS UTC on: Wednesday 7th July 2010.
Latest size estimates of 21 Lutetia: 132 KM by 101 KM by 76 KM.
Update Here.
Andrew Brown.
Thank you very much EarthlingX for that timeline.
It looks like the images will start becoming available from 21:00 HRS UTC / 22:00 CET (BST) / 23:00 SCET.
I intend to watch the release live & will throw images up here on SDC as they become available. I will post enhanced, enlarged crops, etc later on.
Below. Asteroid 21 Lutetia (dead centre) from 5.8 million KM, through NavCam A approx 11:00 HRS UTC on: Wednesday 7th July 2010.
Latest size estimates of 21 Lutetia: 132 KM by 101 KM by 76 KM.
Update Here.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
No problem
Just noticed :
http://www.esa.int : Rosetta lines up for spectacular asteroid flyby
(timeline : ) ...
No problem
Just noticed :
http://www.esa.int : Rosetta lines up for spectacular asteroid flyby
8 July 2010
Artist's impression of asteroid 21 Lutetia
On 10 July, ESA's Rosetta will fly past 21 Lutetia, the largest asteroid ever visited by a satellite. After weeks of manoeuvres and a challenging optical navigation campaign, Rosetta is perfectly lined up to skim by at 3162 km at 18:10 CEST.
(timeline : ) ...
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Rosetta is currently about 2.8 million km from Lutetia.
That's from Dave Muller's mission page for Rosetta.
http://www.dmuller.net/spaceflight/real ... on=rosetta
Rosetta is currently about 2.8 million km from Lutetia.
That's from Dave Muller's mission page for Rosetta.
http://www.dmuller.net/spaceflight/real ... on=rosetta
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
That's interesting Wayne, ESA stated 5.8 million KM yesterday & D Muller's page now states 2.489 million KM 0.016 AU. Wonder what gives???? Their distance would not have shrunk by over 3 million KM after only 24 hrs!!!!!!!!
Below something I mentioned myself a while back, good to see ESA have now reported on this mystery.
21 Lutetia composition remains a mystery. Type C or Type M???.
Herschel Space Telescope & Rosetta to carry out joint observations.
Andrew Brown.
That's interesting Wayne, ESA stated 5.8 million KM yesterday & D Muller's page now states 2.489 million KM 0.016 AU. Wonder what gives???? Their distance would not have shrunk by over 3 million KM after only 24 hrs!!!!!!!!
Below something I mentioned myself a while back, good to see ESA have now reported on this mystery.
21 Lutetia composition remains a mystery. Type C or Type M???.
Herschel Space Telescope & Rosetta to carry out joint observations.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Might make sense if you consider the time differences. Between your and my posts the distance decreased by ~ 1.7 million km/day. If ESA reported the distance as of say the afternoon of the day before their article, and mine was 7 UT today it could make sense. Did they report the time of the measurement?
Currently 2.277 million km (as of 3 hours after your post)
2.489-2.277 = 0.212 million km / 3 = .07 million km/hr * 24 = 1.696 million km/day now
Edit... I believe that distance was at the time the image in the blog was taken, which was at 0542 CEST July 6th ~2.3 days ago.
3488":3pkopixq said:
Might make sense if you consider the time differences. Between your and my posts the distance decreased by ~ 1.7 million km/day. If ESA reported the distance as of say the afternoon of the day before their article, and mine was 7 UT today it could make sense. Did they report the time of the measurement?
Currently 2.277 million km (as of 3 hours after your post)
2.489-2.277 = 0.212 million km / 3 = .07 million km/hr * 24 = 1.696 million km/day now
Edit... I believe that distance was at the time the image in the blog was taken, which was at 0542 CEST July 6th ~2.3 days ago.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Distance now 2,000,000 km. Approach speed ~ 19.1 km/sec.
Time to Close encounter 1 day 11 Hr 57 min
Estimated CA height 3170 km, velocity 15 km/sec
Distance now 2,000,000 km. Approach speed ~ 19.1 km/sec.
Time to Close encounter 1 day 11 Hr 57 min
Estimated CA height 3170 km, velocity 15 km/sec
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
The Rosetta realtime simulation at http://www.dmuller.net/rosetta is now updated with some additional functionality. Events as per ESA blog, and trajectory issue has been fixed.
The Rosetta realtime simulation at http://www.dmuller.net/rosetta is now updated with some additional functionality. Events as per ESA blog, and trajectory issue has been fixed.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
Great to see you here again Daniel
Below 21 Lutetia seen by OSIRIS NAC from 2 million KM. The large asteroid is beginning to show a shape.
ESA Live webcast link
Closest Approach.
0 Days.
19 Hours
19 Minutes
45 Seconds.
Andrew Brown.
Great to see you here again Daniel
Below 21 Lutetia seen by OSIRIS NAC from 2 million KM. The large asteroid is beginning to show a shape.
ESA Live webcast link
Closest Approach.
0 Days.
19 Hours
19 Minutes
45 Seconds.
Andrew Brown.
Re: Asteroid 21 Lutetia (ESA Rosetta Encounter).
:shock:
Sounds like the images near closest approach will be much more detailed than I was expecting. Could be quite spectacular.
3488":4fo2eh53 said:
:shock:
Sounds like the images near closest approach will be much more detailed than I was expecting. Could be quite spectacular.
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