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2005 LW3

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2005 LW3
Radar image of2005 LW3and its satellite (below) by theGoldstone Solar System Radaron 23 November 2022
Discovery[1][2]
Discovered bySiding Spring Survey
Discovery siteSiding Spring Obs.
Discovery date5 June 2005
Designations
2005 LW3
NEO·Apollo·PHA
Orbital characteristics[3]
Epoch25 February 2023 (JD2460000.5)
Uncertainty parameter0
Observation arc17.49 yr (6,389 days)[1]
Aphelion2.106AU
Perihelion0.771 AU
1.439 AU
Eccentricity0.4638
1.73 yr (630.3 days)
81.385°
0° 34m16.171s/ day
Inclination6.021°
59.587°
5 October 2022
288.663°
EarthMOID0.001397 AU (209,000 km; 0.544 LD)
JupiterMOID3.335 AU
Physical characteristics
400 m(primary)[4]
3.6 h[4]
0.02[5]
21.89[3]·21.68[1]

2005 LW3is abinarynear-Earth asteroidclassified as apotentially hazardous objectof theApollo group.It was discovered on 5 June 2005 by theSiding Spring SurveyatSiding Spring ObservatoryinAustralia.[2]It made a close approach of 2.97lunar distances(1.14×10^6km; 0.71×10^6mi) from Earth on 23 November 2022, reaching a peak brightness ofapparent magnitude13 as it passed over thenorthern celestial hemispheresky.[1]It was extensively observed by astronomers worldwide during the close approach, and radar observations byNASA'sGoldstone Solar System RadarinCaliforniadiscovered a 100 m (330 ft)-widenatural satelliteorbiting the asteroid at a wide separation of 4 km (2.5 mi).[6][7]

Physical characteristics

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Goldstone Solar System Radar observations in November 2022 resolved the shape of2005 LW3,revealing a body 400 m (1,300 ft) in diameter—larger than its previously expected diameter of 150 m (490 ft).[4][7]For anabsolute magnitudeof 21.9, this radar-measured diameter indicates that2005 LW3has a very lowgeometric albedoof 0.02.[5]These radar observations also determined arotation periodof 3.6 hours for2005 LW3.[4]

Satellite

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The satellite of2005 LW3was discovered by a team of astronomers[a]using Goldstone Solar System Radar observations from 23–27 November 2022. The satellite appears elongated, with equatorial dimensions of 100 m × 50 m (330 ft × 160 ft).[4]The satellite is widely separated from2005 LW3(the primary body of the system) at asemi-major axisof about 4 km (2.5 mi),[4]which is around 17% of the primary'sHill radius(24 km or 15 mi for an assumed primary density of1.6 g/cm3).[5]The satellite's discovery was announced in aCentral Bureau Electronic Telegramon 10 December 2022.[4]

Notes

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  1. ^Observers credited for the discovery of the satellite include: S. P. Naidu, L. A. M. Benner, M. Brozovic, J. D. Giorgini, S. Horiuchi, I. Savill-Brown, J. Stevens, C. Phillips, P. Edwards, and E. Kruzins.[4]

References

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  1. ^abcd"2005 LW3".Minor Planet Center.Retrieved10 December2022.
  2. ^ab"MPEC 2005-L19: 2005 LW3".Minor Planet Electronic Circular.Minor Planet Center. 6 June 2005.Retrieved10 December2022.
  3. ^ab"JPL Small-Body Database Browser: (2005 LW3)"(2022-12-02 last obs.).Jet Propulsion Laboratory.Retrieved10 December2022.
  4. ^abcdefghGreen, Daniel W. E. (10 December 2022)."CBET 5198: 2005 LW_3".Central Bureau Electronic Telegram.Central Bureau for astronomical Telegrams.Retrieved10 December2022.
  5. ^abcJohnston, Wm. Robert (1 December 2022)."2005 LW3".Johnston's Archive.Retrieved10 December2022.
  6. ^"MPEC 2022-U222: International Asteroid Warning Network (IAWN) Timing Campaign".Minor Planet Electronic Circular.Minor Planet Center. 24 October 2022.Retrieved10 December2022.
  7. ^abBenner, Lance A. M. (10 December 2022)."Goldstone Radar Observations Planning: 2005 LW3, 1998 SS49, and 2017 QL33".echo.jpl.nasa.gov.NASA.Retrieved10 December2022.
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