(35396) 1997 XF11

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(35396) 1997 XF11
Discovery
SMASS = Xk[3]
  • X[6]

    • (35396) 1997 XF11 (

    potentially hazardous asteroid of the Apollo group.[1]

    2028 Earth/Moon approach[3]
    Date & Time Approach
    to     		Nominal distance uncertainty
    region
    (
    3-sigma
    )
    2028-Oct-26 06:44 Earth 929253 km ± 106 km[13]
    2028-Oct-26 07:39 Moon 1326430 km ± 106 km

    Description

    Three months after its discovery on 6 December 1997 by

    LD).[3][14][15] During the close approach, the asteroid should peak at about apparent magnitude 8.2,[16] and will be visible in binoculars.[17]

    1997 XF11 measures between 0.7 and 1.4 kilometers in diameter.[6][4][5]

    This asteroid also regularly comes near the large asteroid Pallas.[15]

    IAU Circular

    On 11 March 1998, using a three-month observation arc, a faulty International Astronomical Union circular and press information sheet were put out that incorrectly concluded "that the asteroid was 'virtually certain' to pass within 80% of the distance to the Moon and stood a 'small...not entirely out of the question' possibility of hitting the Earth in 2028."[18] But by 23 December 1997, it should have been clear that XF11 had no reasonable possibility of an Earth impact.[18] Within hours of the announcement, independent calculations by Paul Chodas, Don Yeomans, and Karri Muinonen had calculated that the probability of Earth impact was essentially zero, and vastly less than the probability of impact from as-yet-undiscovered asteroids.[18] Chodas (1999) concurs with Marsden (1999) that based on the 1997 data alone there was about 1 chance in a hundred thousand that XF11 could have been on an Earth-impact trajectory—that is, until the 1990 precovery observations eliminated such possibilities.[19] During the October 2002 close approach, the asteroid was observed by the 70-meter Goldstone radar dish, further refining the orbit.[17]

    History of close approaches of large near-Earth objects since 1908 (A)
    PHA
    		 Date Approach distance (
    lunar dist.
    )
    H
    )     		Diameter (C)
    (
    m
    )     		Ref (D)
    Nomi-
    nal(B)     		Mini-
    mum     		Maxi-
    mum
    (33342) 1998 WT24 1908-12-16 3.542 3.537 3.547 17.9 556–1795 data
    (458732) 2011 MD5 1918-09-17 0.911 0.909 0.913 17.9 556–1795 data
    (7482) 1994 PC1 1933-01-17 2.927 2.927 2.928 16.8 749–1357 data
    69230 Hermes 1937-10-30 1.926 1.926 1.927 17.5 668–2158 data
    69230 Hermes 1942-04-26 1.651 1.651 1.651 17.5 668–2158 data
    (137108) 1999 AN10 1946-08-07 2.432 2.429 2.435 17.9 556–1795 data
    (33342) 1998 WT24 1956-12-16 3.523 3.523 3.523 17.9 556–1795 data
    (163243) 2002 FB3 1961-04-12 4.903 4.900 4.906 16.4 1669–1695 data
    (192642) 1999 RD32 1969-08-27 3.627 3.625 3.630 16.3 1161–3750 data
    (143651) 2003 QO104 1981-05-18 2.761 2.760 2.761 16.0 1333–4306 data
    2017 CH1 1992-06-05 4.691 3.391 6.037 17.9 556–1795 data
    (170086) 2002 XR14 1995-06-24 4.259 4.259 4.260 18.0 531–1714 data
    (33342) 1998 WT24 2001-12-16 4.859 4.859 4.859 17.9 556–1795 data
    4179 Toutatis 2004-09-29 4.031 4.031 4.031 15.3 2440–2450 data
    2014 JO25
    		 2017-04-19 4.573 4.573 4.573 17.8 582–1879 data
    (137108) 1999 AN10 2027-08-07 1.014 1.010 1.019 17.9 556–1795 data
    (35396) 1997 XF11 2028-10-26 2.417 2.417 2.418 16.9 881–2845 data
    (154276) 2002 SY50 2071-10-30 3.415 3.412 3.418 17.6 714–1406 data
    (164121) 2003 YT1 2073-04-29 4.409 4.409 4.409 16.2 1167–2267 data
    (385343) 2002 LV 2076-08-04 4.184 4.183 4.185 16.6 1011–3266 data
    (52768) 1998 OR2 2079-04-16 4.611 4.611 4.612 15.8 1462–4721 data
    (33342) 1998 WT24 2099-12-18 4.919 4.919 4.919 17.9 556–1795 data
    (85182) 1991 AQ 2130-01-27 4.140 4.139 4.141 17.1 1100 data
    314082 Dryope
    		 2186-07-16 3.709 2.996 4.786 17.5 668–2158 data
    (137126) 1999 CF9 2192-08-21 4.970 4.967 4.973 18.0 531–1714 data
    (290772) 2005 VC 2198-05-05 1.951 1.791 2.134 17.6 638–2061 data
    (A) List includes near-Earth approaches of less than 5
    JPL SBDB, with AU
    converted into LD (1 AU≈390 LD)
    (E) Color codes:   unobserved at close approach   observed during close approach   upcoming approaches

    References

    1. ^ a b c "35396 (1997 XF11)". Minor Planet Center. Retrieved 18 January 2018.
    2. IAU Minor Planet Center
      . 23 December 1997. Retrieved 8 February 2012. (J97X11F)
    3. ^ a b c d e f "JPL Small-Body Database Browser: 35396 (1997 XF11)" (2023-05-29 last obs.). Jet Propulsion Laboratory. Retrieved 21 September 2023.
    4. ^
      S2CID 45334910
      .
    5. ^
      S2CID 56105212
      .
    6. ^ a b c d e f g h "LCDB Data for (35396)". Asteroid Lightcurve Database (LCDB). Retrieved 18 January 2018.
    7. ISSN 1052-8091
      .
    8. ISSN 1052-8091
      .
    9. ISSN 1052-8091
      .
    10. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (35396)". Geneva Observatory. Retrieved 18 January 2018.
    11. S2CID 53493339
      .
    12. doi:10.1016/j.icarus.2012.07.026
      .
    13. ^ "Horizons Batch for 2028-10-26 Close Approach". JPL Horizons. Archived from the original on 12 January 2023. Retrieved 12 January 2023. RNG_3sigma = uncertainty range in km.
    14. ^ Piero Sicoli; Francesco Manca. "Sormano Astronomical Observatory: Table of Next Closest Approaches to the Earth by Asteroids". Astronomical Observatory of Brera. Archived from the original on 1 December 2007. Retrieved 4 February 2008.
    15. ^ a b "NEODyS (35396) 1997XF11 Close Approaches". Department of Mathematics, University of Pisa, ITALY. Archived from the original on 3 March 2016. Retrieved 4 February 2008.
    16. ^ "1997XF11 Ephemerides for 26 Oct 2028". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 16 October 2011.
    17. ^ a b "Halloween Asteroid". 31 October 2002. Retrieved 9 February 2012.
    18. ^ a b c Clark R. Chapman (5 April 1998). "The Asteroid Impact Scare of Mid-March 1998" (last update: 3 September 1998). Southwest Research Institute (SwRI). Retrieved 8 February 2012.
    19. ^ Clark R. Chapman (19 August 1999). "The AsteroidsComet Impact Hazard". Southwest Research Institute (SwRI). Retrieved 9 February 2012.

    External links

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