Characterization of Temporarily Captured Minimoon 2020 CD3 by Keck Time-resolved Spectrophotometry

被引：23

作者：

Bolin, Bryce T. ^{[1
,2
]}

Fremling, Christoffer ^{[1
]}

Holt, Timothy R. ^{[3
,4
]}

Hankins, Matthew J. ^{[1
]}

Ahumada, Tomas ^{[5
]}

Anand, Shreya ^{[1
]}

Bhalerao, Varun ^{[6
]}

Burdge, Kevin B. ^{[1
]}

Copperwheat, Chris M. ^{[7
]}

Coughlin, Michael ^{[8
]}

Deshmukh, Kunal P. ^{[9
]}

De, Kishalay ^{[1
]}

Kasliwal, Mansi M. ^{[1
]}

Morbidelli, Alessandro ^{[10
]}

Purdum, Josiah N. ^{[11
]}

Quimby, Robert ^{[11
,12
]}

Bodewits, Dennis ^{[13
]}

Chang, Chan-Kao ^{[14
]}

Ip, Wing-Huen ^{[14
]}

Hsu, Chen-Yen ^{[14
]}

Laher, Russ R. ^{[2
]}

Lin, Zhong-Yi ^{[14
]}

Lisse, Carey M. ^{[15
]}

Masci, Frank J. ^{[2
]}

Ngeow, Chow-Choong ^{[14
]}

Tan, Hanjie ^{[14
]}

Zhai, Chengxing ^{[16
]}

Burruss, Rick ^{[17
]}

Dekany, Richard ^{[17
]}

Delacroix, Alexandre ^{[17
]}

Duev, Dmitry A. F. ^{[1
]}

Graham, Matthew ^{[1
]}

Hale, David ^{[17
]}

Kulkarni, Shrinivas R. ^{[1
]}

Kupfer, Thomas ^{[18
]}

Mahabal, Ashish ^{[19
]}

Mroz, Przemyslaw J. ^{[1
]}

Neill, James D. ^{[1
]}

Riddle, Reed ^{[17
]}

Rodriguez, Hector ^{[17
]}

Smith, Roger M. ^{[17
]}

Soumagnac, Maayane T. ^{[20
,21
]}

Walters, Richard ^{[1
]}

Yan, Lin ^{[1
]}

Zolkower, Jeffry ^{[17
]}

机构：

[1] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[2] CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA

[3] Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld, Australia

[4] Southwest Res Inst, Dept Space Studies, Boulder, CO 80302 USA

[5] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[6] Indian Inst Technol, Dept Phys, Mumbai 400076, Maharashtra, India

[7] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[8] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[9] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

[10] Univ Cote dAzur, Observ Cote dAzur, Lab Lagrange, CNRS, Blvd Observ,CS 34229, F-06304 Nice 4, France

[11] San Diego State Univ, Dept Astron, 5500 Campanile Dr, San Diego, CA 92182 USA

[12] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Inst Adv Study, Kashiwa, Chiba 2778583, Japan

[13] Auburn Univ, Dept Phys, Leach Sci Ctr, Auburn, AL 36832 USA

[14] Natl Cent Univ, Inst Astron, Taoyuan 32001, Taiwan

[15] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[16] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[17] CALTECH, Opt Observ, Pasadena, CA 91125 USA

[18] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[19] CALTECH, Ctr Data Driven Discovery, Pasadena, CA 91125 USA

[20] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[21] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2020年 / 900卷 / 02期

基金：

美国国家科学基金会; 英国科学技术设施理事会;

关键词：

Asteroids; Near-Earth objects; Meteoroids; DIGITAL SKY SURVEY; AMPLITUDE-PHASE RELATIONSHIP; SIZE-FREQUENCY DISTRIBUTION; NEAR-EARTH ASTEROIDS; YARKOVSKY; DISTRIBUTIONS; POPULATION; SHAPES; LIGHTCURVES; MAGNITUDES;

D O I：

10.3847/2041-8213/abae69

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present time-resolved visible spectrophotometry of 2020 CD3, the second known minimoon. The spectrophotometry was taken with the Keck I/Low Resolution Imaging Spectrometer between wavelengths 434 and 912 nm in theB,g,V,R,I, and RG850 filters as it was leaving the Earth-Moon system on 2020 March 23 UTC. The spectrum of 2020 CD(3)resembles V-type asteroids and some lunar rock samples with a 434-761 nm reddish slope of similar to 18%/100 nm (g-r = 0.62 0.08 andr-i = 0.21 0.06) with an absorption band at similar to 900 nm corresponding toi-z = -0.54 0.10. Combining our measured H of 31.9 0.1 with an albedo of 0.35 typical for V-type asteroids, we determine 2020 CD3's diameter to be similar to 0.9 0.1 m, making it the first minimoon and one of the smallest asteroids to be spectrally studied. We use our time-series photometry to detect significant periodic light-curve variations with a period of similar to 573 s and amplitude of similar to 1. In addition, we extend the observational arc of 2020 CD(3)to 37 days, to 2020 March 23 UTC. From the improved orbital solution for 2020 CD3, we estimate the likely duration of its capture to be similar to 2 yr and the nongravitational perturbation on its orbit due to radiation pressure with an area-to-mass ratio of (6.9 2.4) x 10(-4)m(2)kg(-1)implying a density of 2.3 0.8 g cm(-3), broadly compatible with other meter-scale asteroids and lunar rock. We searched for prediscovery detections of 2020 CD(3)in the Zwicky Transient Facility archive as far back as 2018 October but were unable to locate any positive detections.

引用

页数：14

共 118 条

[1]

[Anonymous], ARXIV161205560

[2]

[Anonymous], 2007, Second-order conservative equations. Numerical Recipes: The art of Scientific Computing

[3]

[Anonymous], 2016, ARXIV161205243

[4]

[Anonymous], 2015, Asteroid Models from Multiple Data Sources

[5]

BARUCCI MA, 1982, MOON PLANETS, V27, P47

[6] The Zwicky Transient Facility: System Overview, Performance, and First Results [J].

Bellm, Eric C. ;

Kulkarni, Shrinivas R. ;

Graham, Matthew J. ;

Dekany, Richard ;

Smith, Roger M. ;

Riddle, Reed ;

Masci, Frank J. ;

Helou, George ;

Prince, Thomas A. ;

Adams, Scott M. ;

Barbarino, C. ;

Barlow, Tom ;

Bauer, James ;

Beck, Ron ;

Belicki, Justin ;

Biswas, Rahul ;

Blagorodnova, Nadejda ;

Bodewits, Dennis ;

Bolin, Bryce ;

Brinnel, Valery ;

Brooke, Tim ;

Bue, Brian ;

Bulla, Mattia ;

Burruss, Rick ;

Cenko, S. Bradley ;

Chang, Chan-Kao ;

Connolly, Andrew ;

Coughlin, Michael ;

Cromer, John ;

Cunningham, Virginia ;

De, Kishalay ;

Delacroix, Alex ;

Desai, Vandana ;

Duev, Dmitry A. ;

Eadie, Gwendolyn ;

Farnham, Tony L. ;

Feeney, Michael ;

Feindt, Ulrich ;

Flynn, David ;

Franckowiak, Anna ;

Frederick, S. ;

Fremling, C. ;

Gal-Yam, Avishay ;

Gezari, Suvi ;

Giomi, Matteo ;

Goldstein, Daniel A. ;

Golkhou, V. Zach ;

Goobar, Ariel ;

Groom, Steven ;

Hacopians, Eugean .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2019, 131 (995)

[7]

BINZEL RP, 1989, ASTEROIDS II, P416

[8] CHIPS OFF OF ASTEROID-4 VESTA - EVIDENCE FOR THE PARENT BODY OF BASALTIC ACHONDRITE METEORITES [J].

BINZEL, RP ;

XU, S .

SCIENCE, 1993, 260 (5105) :186-191

[9] Size-dependent modification of asteroid family Yarkovsky V-shapes [J].

Bolin, B. T. ;

Morbidelli, A. ;

Walsh, K. J. .

ASTRONOMY & ASTROPHYSICS, 2018, 611

[10] Detecting Earth's temporarily-captured natural satellites-Minimoons [J].

Bolin, Bryce ;

Jedicke, Robert ;

Granvik, Mikael ;

Brown, Peter ;

Howell, Ellen ;

Nolan, Michael C. ;

Jenniskens, Peter ;

Chyba, Monique ;

Patterson, Geoff ;

Wainscoat, Richard .

ICARUS, 2014, 241 :280-297

← 1 2 3 4 5 6 7 8 9 10 →