Asteroid Research projects in the Age of Wide-field Surveys

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Presentation transcript:

Asteroid Research projects in the Age of Wide-field Surveys Brian D. Warner Center for Solar System Studies / MoreData! Inc. http://planetarysciences.org NASA 80NSSC18K0851

Coming attractions Taking on the giants What’s needed Yarkovsky and YORP asteroid projects Publish your work

Taking on the giants Discovery is out follow-up is in: Time-sensitive astrometry to avoid losing an asteroid (V > 19) Astrometry and Photometry to help plan radar observations Physical characterization

What’s Needed You can do it! Telescope and ccd (DSLR) camera Familiarity with: Taking images Image reduction (dark/flats) Lightcurve period analysis (Basic) publishing science papers You can do it!

Blame it on YORP and Yarkovsky YORP (Yarkovsky-O’Keefe-Radzievskii-Paddack

Yarkovsky at work

Ups and downs of yorp

Asteroid research projects

H-g curves Absolute Magnitude (H) Phase Slope Parameter (G) V mag at 1 AU from Sun/Earth, a = 0° Phase Slope Parameter (G) Defines curve over a range of phase angles Accounts for “Opposition Effect” Rough correlation to taxonomic class

Binary asteroids 2000 DP107 Margot et al., 2002

Binary asteroids Optical Binary Discovery: Show Me the Lightcurve! Best Proof: Mutual Events Stephens and Warner (2016, MPB 43)

Finding the Ds/Dp Ratio: 1727 Mette Binary asteroids Finding the Ds/Dp Ratio: 1727 Mette Use shallowest attenuation Ds/Dp = 𝟏𝟎 𝟎.𝟒∆𝒎 −𝟏.𝟎 Ds/Dp = 𝟏𝟎 𝟎.𝟎𝟏𝟖 −𝟏.𝟎 Ds/Dp = 𝟎.𝟐𝟎±𝟎.𝟎𝟐

Family studies Putting it all together Rotation Statistics Show frequency distribution Signs of YORP Excess of slow rotators Flat distribution Compare stats across families

Family studies Putting it all together Spin Axis Statistics Show distribution Signs of YORP Grouping Favoring poles

Rotational statistics

The Minor Planet bulletin Refereed journal (SAO/NASA ADS) No Page Charges Open to any author Author friendly Vol 46-3: 146 pages, 220+ lightcurves! http://minorplanet.info/MPB

Asteroid lightcurve data exchange format Alcdef Asteroid lightcurve data exchange format Raw asteroid time-series data 3.5 million observations 32.5 million coming Standard and simple formats Open to anyone for upload and download http://alcdef.org

YES! WILL YOUR WORK MAKE A DIFFERENCE? Minor Planet Mailing List (MPML) https://groups.yahoo.com/neo/groups/mpml/info All the Things (not just asteroids) Citizen Scientists can do http://socastrosci.org