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Previously,
at Bolides 2009 Prague...
Veres et al. (2009)
Sky-plane probability distribution for impactors 30 days before impact
with V < 22.7 and apparent motion < 12 deg/day
2008 TC3
Sky-plane probability distribution for 3 meterdiameter impactors (bolides) 1 day before impact
with V < 22.7 and apparent motion < 12 deg/day
Veres et al. (2009)
impactor discoveries in a4 year PS1 survey mission
3 night orbit1 night tracklet
Veres et al. (2009)
Veres et al. (2009)
impactor discoveries in a4 year PS1 survey mission
3 night orbit1 night tracklet
So how did CSS find 2008 TC3?
• they got ‘lucky’ or
• there are more small impactors than expected or
• something is wrong with our simulation
ATLAS
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
• John Tonry, PI
• 8 telescopes and cameras– 25cm aperture, f/2.8, 5° FOV, 20 deg2
– 4x4k pixels at 4.4”/pix– 30s exp, 4s readout, 10e- read-noise
• Sensitivity at SNR=5– V=19.3 1 telescope, 1 exp, red & blue– V=20.0 4 telescope, 4 exp, red & blue
• Deployment– 2 pairs x 2 pointings x 2 sites – “blue” (g+r) and “red” (r+i) filters– 2 observations of 20,000 deg2/night
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
ATLAS
A STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
TLAS
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
ATLAS
• portable • robotic• autonomous
Ironwood Observatory
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
ATLAS
• Cost• ≈ $2M construction for 2 sites• ≈ $0.5M/year operations• ≈ $1M incremental/site
• Time• 2 years from start of funding
• Asteroid collisions• 10m MB asteroid disruption/day• 100m MB asteroid disruption/year• 1000m dust cloud visible in MB
• Light curves• ~400 photometric observations/year
for ~105 asteroids
• Bolides• One bolide like 2008 TC3 per year
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
ATLAS
ATLAS
ATLASwill identify>60% of allimpactors
STEROID
ERRESTRIALIMPACT
AST
LERT
YSTEM
ATLAS
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