INCOMING!, Detection and observation of Earth-approaching asteroids. |
INCOMING!, Detection and observation of Earth-approaching asteroids. |
Jul 17 2017, 10:43 AM
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#391
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
this is interesting: ESA tested on LISA Pathfinder the possibility of using the spacecraft star trackers to observe near Earth asteroids (with some success, apparently)
http://blogs.esa.int/rocketscience/2017/07...unts-asteroids/ |
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Jul 20 2017, 09:34 PM
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#392
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
this is interesting: ESA tested on LISA Pathfinder the possibility of using the spacecraft star trackers to observe near Earth asteroids (with some success, apparently) http://blogs.esa.int/rocketscience/2017/07...unts-asteroids/ Actually, it would be interesting to know if their ultra stability requirements allow them to detect dust particle impacts & their direction. Would be interesting data, anyways. -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Jul 21 2017, 03:41 AM
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#393
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
there was an arXiv paper on this subject:
Detection and Characterization of Micrometeoroids with LISA Pathfinder QUOTE The Solar System contains a population of dust and small particles originating from asteroids, comets, and other bodies. These particles have been studied using a number of techniques ranging from in-situ satellite detectors to analysis of lunar microcraters to ground-based observations of zodiacal light. In this paper, we describe an approach for using the LISA Pathfinder (LPF) mission as an instrument to detect and characterize the dynamics of dust particles in the vicinity of Earth-Sun L1. Launching in late 2015, LPF is a dedicated technology demonstrator mission that will validate several key technologies for a future space-based gravitational-wave observatory. The primary science instrument aboard LPF is a precision accelerometer which we show will be capable of sensing discrete momentum impulses as small as 4×10−8N⋅s. We then estimate the rate of such impulses resulting from impacts of micrometeoroids based on standard models of the micrometeoroid environment in the inner solar system. We find that LPF may detect dozens to hundreds of individual events corresponding to impacts of particles with masses >10−9g during LPF's roughly six-month science operations phase in a 5×105km by 8×105km Lissajous orbit around L1. In addition, we estimate the ability of LPF to characterize individual impacts by measuring quantities such as total momentum transferred, direction of impact, and location of impact on the spacecraft. Information on flux and direction provided by LPF may provide insight as to the nature and origin of the individual impact and help constrain models of the interplanetary dust complex in general. Additionally, this direct in-situ measurement of micrometeoroid impacts will be valuable to designers of future spacecraft targeting the environment around L1. don't know whether any meaningful results were obtained or not |
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Jul 21 2017, 05:38 AM
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#394
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
Thanks for that paper! I searched citations on it, and it looks like the same authors just published some initial results, with some candidate impacts:
http://iopscience.iop.org/article/10.1088/...0/1/012007/meta -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Apr 14 2019, 03:18 PM
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#395
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Noticed on the calendar that yesterday marked 10 years until the 2029 Apophis flyby! I presume a lot of telescopic/radar observations will be done, but haven't heard of any missions being planned to it (anyone know if those proposals are going ahead?). That Friday the 13th should be an unaided eye reminder of Earth's place in the solar system, in addition to the scientific value of observing this object get so close; if it's a rubble-pile, might it break-up from Earth's tides?
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Apr 14 2019, 05:38 PM
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#396
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Hmm. Sentry no longer seems to be tracking the 2029 approach as an impact risk. I assume that means that once the risk is completely retired the model stops paying attention?
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Apr 14 2019, 06:51 PM
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#397
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
haven't heard of any missions being planned to it (anyone know if those proposals are going ahead?) I have seen a few missions proposed over the years. see for ex http://www.unoosa.org/pdf/pres/stsc2010/tech-45.pdf |
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Jun 26 2019, 04:03 PM
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#398
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
I looks like they detected another rock headed for Earth just before it impacted. Entry occurred June 22nd around 21:30 UT. It was first noticed by ATLAS-MLO around 10 am UT and subsequently a detection by Pan-STARRS was found from a couple of hours earlier than that.
The (very small) asteroid is being designated 2019 MO. Now presumed deceased. The Minor Planet Center is only just now reporting it after the fact. They've been running way behind on their work lately. Apparently they've been having some serious computer issues. LINK to MPC report on 2019 MO Update: Here is a report from an asteroid blog site: Small Asteroid Impacted |
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Jun 27 2019, 05:51 AM
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#399
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Member Group: Members Posts: 184 Joined: 2-March 06 Member No.: 692 |
COOL!
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Mar 26 2021, 03:53 PM
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#400
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
New radar images of Apophis; very pixelly, but seems to be a peanut shape, as is common.
https://www.nasa.gov/feature/jpl/nasa-analy...-100-plus-years And more importantly: impacts ruled out of the next century, due to the precision of the measurements. |
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Jun 11 2021, 06:54 PM
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#401
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Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
NEO Surveyor approved for next phase of development (decision phase B )
https://www.nasa.gov/feature/nasa-approves-...ue-development/ Still no approximate launch date, however.... |
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Jun 17 2021, 12:29 AM
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#402
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Member Group: Members Posts: 127 Joined: 15-April 21 Member No.: 9009 |
New radar images of Apophis; very pixelly, but seems to be a peanut shape, as is common. https://www.nasa.gov/feature/jpl/nasa-analy...-100-plus-years And more importantly: impacts ruled out of the next century, due to the precision of the measurements. this is the most accurate shape model we have for this particular rock https://echo.jpl.nasa.gov/asteroids/brozovi...pophis.2018.pdf a user from the celestia forums contacted the author of the paper above and sent the shape model (obj), sence the user that contacted the author is not a member here, i'll post it for you guys apophis_model_2018.zip ( 43.58K ) Number of downloads: 534 its a good thing apophis will not hit earth our lifetime! |
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Sep 4 2024, 04:32 PM
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#403
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
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Sep 4 2024, 04:46 PM
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#404
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
Above link no longer live, but available for replay. Asteroid 2024 RW1 expected to have impacted ten minutes ago. No confirmation yet.
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