small bodies assessment group meeting #14 …...jfc size distributions. neowise 2016 data release...
TRANSCRIPT
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The NEOWISE TeamPresented by James “Gerbs” Bauer, Deputy PI
January 27, 2016
Small Bodies Assessment Group Meeting #14NEOWISE Reactivation Update
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NEOWISE Reactivation Overview• Science objectives:
–Survey Near-Earth Objects (NEOs) at mid-infrared wavelengths using WISE channels W1 and W2
–Obtain physical characterization (including diameters and albedos) of these objects
• Science team members: – JPL: Amy Mainzer, PI; James Bauer, Deputy PI; Joe
Masiero; Emily Kramer and Sarah Sonnett (postdocs) – IPAC: Roc Cutri, Carrie Nugent– PSI: Tommy Grav– UCLA: Ned Wright
• Project Mgr: Beth Fabinsky
• JPL roles: - Div. 32 (PI, Science Team)- Div. 31/34/39 (Operations)- 7X: Management- 8X: ESMC operations facility
• Partners:- IPAC Science data processing - BATC S/C ops support - SDL payload ops support - UCLA survey design- ATK operations support- Alethium GDS support
• Reactivation of NEOWISE mission following hibernation of WISE S/C in February 2011
• 3.4 and 4.6 µm bands (W1 and W2)• ~75K post-cryo operation • Low-Earth orbit with downlink through
TDRSS• Similar mission plan, observing strategy as
WISE/NEOWISE• 3-year Survey
2010 GH7
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NEOWISE Reactivation Year 1 Data Release 3/26, 2015
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• MBAs• NEAs• Comets
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• The reactivated NEOWISE has made infrared detections of 18159solar system objects as of 1/22/16, including 467 NEOs of which 78 are new discoveries
• Recent discoveries include:– Two comets within a single day,– First Three NEO discoveries of 2016 are PHAs, – An Aten asteroid (2015 XY278) that crosses the orbits of the Earth, Venus and
Mercury
• 301 deliveries to the MPC, including 40188 Tracklets
Science Progress to Date
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Diameters & Albedos Unchanged by Hibernation
Diameters and albedos using W1 and W2 are consistent with values from original NEOWISE mission
1st year follow-up, Nugent et al. 2015, ApJ 814, 177
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NEOWISE Synergies with Other Projects
NEOWISE data: • enable better predictions for radar target
prioritization
• allow diameters and albedos to be computed for objects discovered by other surveys
• support pre-covery of NEO candidates using IRSA services
2014 HQ124• Discovered by NEOWISE 4/23/14• Goldstone-Arecibo Obs. 6/8/14• NEOWISE diam. 330+/-80m,
Goldstone/Aricebo diam. 370m
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Comet Observing Campaigns
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67P/Churyumov-Gerasimenko, Dec. 21, 2015
C/2013 A1, Siding Spring, July 18, 2014
NEOWISE Supports coordinated campaigns:• Comet C/2013 A1 Siding
Spring observations• C/2013 US10 Catalina• Recent jointly coordinated
observation campaign of 67P with the Rosetta mission MIRO instrument Team.
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NEOWISE Depends on NEOO Program Observatories for Follow-up
Extremely grateful for the follow-up effort of the community!!
YR1 + YR2 Follow-upNugent et al. 2016 (in prep.)
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Peer-Reviewed Publications
• Total citation count using NEOWISE data & discoveries: >200 refereed publications– Total citation count for WISE/NEOWISE >1500 refereed
publications
• NEOWISE is a time-domain mid-infrared all-sky survey, so its science spans a wide range of topics
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Recent Science Highlights
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Diameters & Albedos from Reactivation Year 1
• Nugent et al. (2015 ApJ): Diameters & albedos for 7956 asteroids detected in Yr1
• Diameters accurate to ~20%, albedos to ~40%
• NEOWISE preferentially detects large NEOs
• NEO discoveries tend to be dark• Nearly a quarter are PHAs
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• Euphrosyne family mimics extinct JFCs in NEA populations• Jupiter Tisserand parameter < 3 and albedos of a few percent• Euphrosyne family populates an otherwise rare region of NEO
space, allowing for direct links from NEO to formation 12
Euphrosyne Family Study
Masiero et al. 2015 (ApJ)
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Grav et al. 2015 (ApJ): Jovian Irregular Satellite populations darker than Jupiter Trojans or Hildas, and are a better match with cometary populations.
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Irregular Satellites
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• Close & contact binaries can sometimes be identified by their large brightness variations
• We identified 77 Trojan and Hilda asteroids w/ large NEOWISE brightness variations: • binary candidates.
• 29 new binary candidates out of 953 Trojans (13-150 km) estimated fraction of 14-25%
• 48 new binary candidates out of 554 Hildas (4-36 km) estimated fraction of 30-51%
Binary Asteroids Candidates Identified by Large Amplitude Lightcurves
Sonnett et al. (2015)
• Candidates are in need of follow-up to confirm binarity (follow-up underway)
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Dust tails in the NEOWISE data
o Kramer et al ApJ (2016, submitted): Dynamical models are used to constrain the size and age of the particles, with the best models selected using a novel analytical tail fitting method.
Example of WISE data dust tail analysis: Kramer et al. 2014 (based on PhD thesis work)
C/2008 N1
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The NEOWISE CO+CO2 Survey
• Completed largest survey of CO+CO2 to date
• LPCs and SPCs behave the same closer to Sun, but larger fraction of LPCs produce more CO+CO2 further from Sun
• LPCs maintain more of their lighter volatiles
• Differences in CO+CO2 reflect thermal history
CO
+CO
2-to
-Dus
t Pro
duct
ion
Rat
io (l
og u
nits
)
Distance from the Sun (Relative to Earth-Sun Distance)
Comet Dust Temperature (approximate)
286K 165K 128K 108K 95K
Water + CO2 Driven Ac vity
CO+CO2 Driven Ac vity
Know
n Co
mets
NEO
WISE Discoverie
s
SPCs
LPCs
Bauer et al. 2015, The Astrophysical Journal
NEOWISE’s View of C/2006 W3 Christensen
4 arcmin = 700,000 km
4.6 µm; CO+CO2 3.4, 12, & 22 µm; Dust
‐V
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Extinct comet candidates
• Licandro et al (2015, Astron. and Astrop.) Size and albedo distributions of Asteroids in Cometary Orbits using WISE data
Found that Tancredi-
selected extinct comet
candidates better-
matched Centaur &
JFC size distributions.
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NEOWISE 2016 Data ReleaseScheduled for March 2016
• Single-exposure data from the second year of the NEOWISE Reactivation Mission
• Two complete sky coverages, bringing total to four coverages since start of Reactivation
• Data access:– Image and source database from the NASA/IPAC Infrared Science
Archive (IRSA) http://irsa.ipac.caltech.edu/wise – Moving Object tracklets from the IAU Minor Planet Center
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C/2013 US10 (Catalina), Aug. 2015
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Year 2 NEOWISE Data Combined with Year 1 Data In Single Archive
Year 1 Year 2 Total
Single-exposure Images(image sets) 2,497,867 2,557,865 5,055,732
Single-exposure Source Database (detections) 18,468,575,596 19,691,230,571 38,159,806,157
Moving Object Tracklets(detections/objects)
136,63510,200
162,73611,786
299,371 17,240
Known Solar System ObjectPossible Assoc. List(entries/objects)
14,383,217563,059
15,626,395614,606
30,008,612640,236
We are excited to see what will be done with this data release!
Thank You!!