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INCOMING!, Detection and observation of Earth-approaching asteroids.
Paolo
post Jul 17 2017, 10:43 AM
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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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hendric
post Jul 20 2017, 09:34 PM
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QUOTE (Paolo @ Jul 17 2017, 04:43 AM) *
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.


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Paolo
post Jul 21 2017, 03:41 AM
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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 410−8N⋅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 5105km by 8105km 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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hendric
post Jul 21 2017, 05:38 AM
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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


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Explorer1
post Apr 14 2019, 03:18 PM
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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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nprev
post Apr 14 2019, 05:38 PM
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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?


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Paolo
post Apr 14 2019, 06:51 PM
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QUOTE (Explorer1 @ Apr 14 2019, 05:18 PM) *
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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Holder of the Tw...
post Jun 26 2019, 04:03 PM
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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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monty python
post Jun 27 2019, 05:51 AM
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COOL!
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