Surface Heterogeneity, Physical, and Shape Model of Near-Earth Asteroid (52768) 1998 OR2

被引：2

作者：

Devogele, Maxime ^{[1
]}

McGilvray, Anna ^{[1
]}

MacLennan, Eric ^{[2
]}

Monchinski, Courteney ^{[3
]}

Marshall, Sean E. ^{[1
]}

Hickson, Dylan ^{[4
]}

Virkki, Anne ^{[2
]}

Giorgini, Jon D. ^{[5
]}

Abe, Lyu ^{[6
]}

Augustin, David ^{[7
]}

Aznar-Macias, Amadeo ^{[8
]}

Baudouin, Philippe ^{[9
]}

Behrend, Raoul ^{[10
]}

Bendjoya, Philippe ^{[6
]}

Benkhaldoun, Zouhair ^{[11
]}

Bosch, Josep ^{[12
]}

Cellino, Alberto ^{[13
]}

Chatelain, Joseph ^{[14
]}

Deldem, Marc ^{[15
]}

Ferrais, Marin ^{[1
]}

Goncalves, Rui ^{[16
,17
]}

Houdin, Gerard ^{[7
]}

Husarik, Marek ^{[18
]}

Jehin, Emmanuel ^{[19
]}

Kareta, Teddy ^{[20
]}

Kim, Myung-Jin ^{[21
]}

Licandro, Javier ^{[22
]}

Lister, Tim ^{[14
]}

Medeiros, Hissa ^{[22
,23
]}

Pravec, Petr ^{[24
]}

Rivet, Jean-Pierre ^{[6
]}

Rousseau, Gerald ^{[25
]}

Roh, Dong-Goo ^{[21
]}

Skiff, Brian ^{[20
]}

Taylor, Patrick A. ^{[26
]}

Venditti, Flaviane ^{[1
]}

Vernet, David ^{[27
]}

Vienney, Jean-Michel ^{[28
]}

Yim, Hong-Suh ^{[21
]}

Zambrano-Marin, Luisa ^{[1
]}

机构：

[1] Univ Cent Florida, Arecibo Observ, HC-3 Box 53995, Arecibo, PR 00612 USA

[2] Univ Helsinki, Dept Phys, POB 64, Helsinki 00014, Finland

[3] Tokyo Inst Technol, Earth Life Sci Inst ELSI, Meguro, Tokyo 1528550, Japan

[4] Colorado Sch Mines, Ctr Wave Phenomena, 1500 Illinois St, Golden, CO 80401 USA

[5] CALTECH, Jet Prop Lab, Pasadena, CA 91011 USA

[6] Univ Cote dAzur, CNRS, OCA, LAGRANGE, Nice, France

[7] Deep Sky Chile, Pichasca, Chile

[8] Isaac Aznar Observ, APT Observ Grp, Valencia, Spain

[9] Soc Astron Havre, F-76615 St Martin Du Bec, Seine Maritime, France

[10] Geneva Observ, CH-1290 Sauverny, Switzerland

[11] Cadi Ayyad Univ, High Energy Phys & Astrophys Lab, Oukaimeden Observ, Marrakech, Morocco

[12] S Maria de Montmagastrell, Tarrega, Spain

[13] INAF, Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy

[14] Las Cumbres Observ LCO, 6740 Cortona Dr,Suite 102, Goleta, CA 93117 USA

[15] Barres Observ, F-13113 Lamanon, Bouches Du Rhon, France

[16] Inst Politecn Tomar, Ci2, P-2300313 Tomar, Portugal

[17] UDMF, P-2300313 Tomar, Portugal

[18] Slovak Acad Sci, Astron Inst, SK-05960 Tatranska Lomnica, Slovakia

[19] Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee 6 Aout 19, B-4000 Liege, Belgium

[20] Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA

[21] Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea

[22] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38205, Tenerife, Spain

[23] Inst Astrofis Canarias IAC, C-Via Lactea S-N, San Cristobal la Laguna 38205, Tenerife, Spain

[24] Czech Acad Sci, Astron Inst, Prague, Czech Republic

[25] Observ Chillou, F-37500 La Roche Clermault, Indre & Loire, France

[26] Natl Radio Astron Observ, Green Bank Observ, 1180 Boxwood Estate Rd, Charlottesville, VA 22903 USA

[27] Univ Cote dAzur, CNRS, OCA, GALILEE, Nice, France

[28] Roncevaux Observ, F-77760 Buthiers, Seine & Marne, France

来源：

PLANETARY SCIENCE JOURNAL | 2024年 / 5卷 / 02期

基金：

美国国家航空航天局;

关键词：

RADAR OBSERVATIONS; LIGHTCURVE INVERSION; SPECTROSCOPIC SURVEY; OPTIMIZATION METHODS; THERMAL-MODEL; PHASE CURVES; POLARIZATION; CALIBRATION; ROUGHNESS; DENSITY;

D O I：

10.3847/PSJ/ad1f70

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 2020 April 29, the near-Earth object (52768) 1998 OR2 experienced a close approach to Earth at a distance of 16.4 lunar distances (LD). 1998 OR2 is a potentially hazardous asteroid of absolute magnitude H = 16.04 that can currently come as close to Earth as 3.4 LD. We report here observations of this object in polarimetry, photometry, and radar. Our observations show that the physical characteristics of 1998 OR2 are similar to those of both M- and S-type asteroids. Arecibo's radar observations provide a high radar albedo of sigma OC= 0.29 +/- 0.08, suggesting that metals are present in 1998 OR2 near-surface. We find a circular polarization ratio of mu c = 0.291 +/- 0.012, and the delay-Doppler images show that the surface of 1998 OR2 is a top-shape asteroid with large-scale structures such as large craters and concavities. The polarimetric observations display a consistent variation of the polarimetric response as a function of the rotational phase, suggesting that the surface of 1998 OR2 is heterogeneous. Color observations suggest an X-complex taxonomy in the Bus-DeMeo classification. Combining optical polarization, radar, and two epochs from the NEOWISE satellite observations, we derived an equivalent diameter of D = 1.80 +/- 0.1 km and a visual albedo p v = 0.21 +/- 0.02. Photometric and radar data provide a sidereal rotation period of P = 4.10872 +/- 0.00001 hr, a pole orientation of (332.degrees 3 +/- 5 degrees, 20.degrees 7 +/- 5 degrees), and a shape model with dimensions of (2.08-0.10+0.10,1.93-0.10+0.10,1.60-0.05+0.05) km.

引用

页数：23

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