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 TC 3 Sky-plane probability distribution for 3 meter diameter impactors (bolides) 1 day before impact with V < 22.7 and apparent motion < 12 deg/day Veres et al. (2009)

impactor discoveries in a 4 year PS1 survey mission 3 night orbit 1 night tracklet Veres et al. (2009)

impactor discoveries in a 4 year PS1 survey mission 3 night orbit 1 night tracklet So how did CSS find 2008 TC 3 ? they got ‘lucky’ or there are more small impactors than expected or something is wrong with our simulation they got ‘lucky’ or there are more small impactors than expected or something is wrong with our simulation

AA TT LL AA SS STEROID ERRESTRIAL IMPACT AST LERT YSTEM John Tonry, PI 8 telescopes and cameras –25cm aperture, f/2.8, 5° FOV, 20 deg 2 –4x4k pixels at 4.4”/pix –30s exp, 4s readout, 10e- read-noise Sensitivity at SNR=5 –V=19.31 telescope, 1 exp, red & blue –V=20.04 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 deg 2 /night

STEROID ERRESTRIAL IMPACT AST LERT YSTEM AA TT LL AA SS

AA STEROID ERRESTRIAL IMPACT AST LERT YSTEM TT LL AA SS

STEROID ERRESTRIAL IMPACT AST LERT YSTEM AA TT LL AA SS portable robotic autonomous Ironwood Observatory

STEROID ERRESTRIAL IMPACT AST LERT YSTEM AA TT LL AA SS 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 ~10 5 asteroids Bolides One bolide like 2008 TC3 per year STEROID ERRESTRIAL IMPACT AST LERT YSTEM AA TT LL AA SS

AA TT LL AA SS ATLAS will identify >60% of all impactors

STEROID ERRESTRIAL IMPACT AST LERT YSTEM AA TT LL AA SS