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Asteroid approach, Science operations begin!
Holder of the Tw...
post Aug 24 2018, 06:48 PM
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NASA update on the OSIRIS-REx mission, includes first picture of the asteroid from the spacecraft.

Begins Operations
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B Bernatchez
post Oct 6 2018, 10:33 PM
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First Approach Maneuver completed:

https://www.asteroidmission.org/?latest-new...proach-maneuver

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Explorer1
post Oct 19 2018, 02:12 PM
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New images! (they will be leaving the '8-bit' phase pretty soon)

https://www.asteroidmission.org/bennu-oct-2018-pixel-zoom/
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mcaplinger
post Oct 19 2018, 04:16 PM
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QUOTE (Explorer1 @ Oct 19 2018, 06:12 AM) *

When I first read this I assumed that there was an error in the captions: at a little under 10,000 km range Bennu is only 3.7 pixels in Polycam? But it's true, and that just goes to show how dinky Bennu is. Polycam's IFOV is 13.5 urad so at range R Bennu (246 meters mean radius) subtends 0.246*2/(R*13.5e-6) pixels.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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Explorer1
post Oct 24 2018, 08:03 PM
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https://www.asteroidmission.org/bennu-jupit...exobservations/

New image, plus a comparison with the Jupiter observation from last year to illustrate the albedo difference. Seems like another Ryugu so far....
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Hungry4info
post Oct 26 2018, 01:18 AM
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New rotation movie from 3000 km taken on 23 Oct 2018. We can see surface features, even if it's not clear exactly what they are.

https://www.asteroidmission.org/bennu-13px/


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-- Hungry4info (Sirius_Alpha)
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Phil Stooke
post Oct 26 2018, 05:37 AM
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These are the 3 frames in that short movie, a bit processed. One suggests a crater, maybe bigger (relatively) than any on Ryugu.

Phil

Attached Image


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... because the Solar System ain't gonna map itself.
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Guest_mcmcmc_*
post Oct 29 2018, 01:39 PM
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Countdowns:
https://programmi.000webhostapp.com/osiris/...is-counter.html

They are based on odd data: "future telemetries" available as "digital readouts", which always says 00:00 is the time of the maneuvers, and PDF schedule, I don't know where to find better data.
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Guest_mcmcmc_*
post Oct 29 2018, 02:39 PM
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QUOTE (mcmcmc @ Oct 29 2018, 02:39 PM) *
Countdowns:


Found more rich but less embellished countdowns:
http://www.whereisroadster.com/osiris_rex/
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Paolo
post Oct 30 2018, 07:41 PM
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Bennu at 100 Pixels

looking a lot like Ryugu
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Phil Stooke
post Oct 30 2018, 09:43 PM
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One very good thing about this is that I can use exactly the same map projection for Bennu as I used for Ryugu. Only the scale has to change.

Phil


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... because the Solar System ain't gonna map itself.
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Guest_mcmcmc_*
post Oct 31 2018, 01:44 PM
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These direct query links to NASA Horizons provide objects distance from the Sun in km:

OSIRIS-Rex
Bennu

Look for "$$SOE" in result; distance in km is value 3 counting from 0.
Resulting current distance between OSIRIS-Rex and Bennu:
2018-Oct-31 14:40 - 236.16 km

It looks quite precise despite the big distance: this method gives 7 km as Hayabusa2-Ryugu distance, which is currently 5 km.
I think the distance is based on light travel time.
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mcaplinger
post Oct 31 2018, 04:09 PM
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There are SPICE kernels for Orex at https://naif.jpl.nasa.gov/pub/naif/ORX/kernels/ -- AFAIK this is what the flight team is using.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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Guest_mcmcmc_*
post Oct 31 2018, 04:58 PM
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QUOTE (mcaplinger @ Oct 31 2018, 05:09 PM) *
There are SPICE kernels for Orex at https://naif.jpl.nasa.gov/pub/naif/ORX/kernels/ -- AFAIK this is what the flight team is using.

I have no idea of what SPICE kernels are. rolleyes.gif
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mcaplinger
post Oct 31 2018, 08:44 PM
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QUOTE (mcmcmc @ Oct 31 2018, 08:58 AM) *
I have no idea of what SPICE kernels are. rolleyes.gif

They are files that capture the position and orientation of spacecraft and solar system bodies, used for mission planning and data analysis. https://naif.jpl.nasa.gov/naif/aboutspice.html

If NASA Horizons does what you want, then by all means use it. I'm not certain how frequently it's updated, however.


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