(35396) 1997 XF11

Three months after its discovery on 6 December 1997 by James V. Scotti of the University of Arizona's Spacewatch Project, the asteroid was predicted to make an exceptionally close approach to Earth on 28 October 2028. Additional precovery observations of the asteroid from 1990 were quickly found that refined the orbit and it is now known the asteroid will pass Earth on 26 October 2028, at a distance of {{convert|929000|km|LD|abbr=on|lk=on}}. During the close approach, the asteroid should peak at about apparent magnitude 8.2, and will be visible in binoculars.

{{mp|1997 XF|11}} measures between 0.7 and 1.4 kilometers in diameter.

This asteroid also regularly comes near the large asteroid Pallas.

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." But by 23 December 1997, it was clear that XF11 had no reasonable possibility of an Earth impact. Many news outlets mistakenly emphasized the possibility of disaster.{{Cite web |author= |title=Twenty Years of Tracking Near-Earth Objects |url=https://www.jpl.nasa.gov/news/twenty-years-of-tracking-near-earth-objects |access-date=2024-07-23 |website=NASA Jet Propulsion Laboratory (JPL) |language=en-US}}

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. 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. During the October 2002 close approach, the asteroid was observed by the 70-meter Goldstone radar dish, further refining the orbit.

{{Large near earth asteroid flybys 5LD}}

{{reflist|refs=

{{Cite web

|title=MPEC 1997-Y11 : 1997 XF11

|publisher=IAU Minor Planet Center

|date=1997-12-23

|url=https://www.minorplanetcenter.net/iau/mpec/J97/J97Y11.html

|accessdate=2012-02-08

|archive-date=18 August 2017

|archive-url=https://web.archive.org/web/20170818045155/http://www.minorplanetcenter.net/iau/mpec/J97/J97Y11.html

|url-status=live

}} (J97X11F)

{{cite web

|type = 2023-05-29 last obs.

|title = JPL Small-Body Database Browser: 35396 (1997 XF11)

|url = https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2035396&view=OPC

|publisher = Jet Propulsion Laboratory

|accessdate = 2023-09-21

|archive-date = 2 May 2021

|archive-url = https://web.archive.org/web/20210502171013/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000130#/?sstr=2035396&view=OPC

|url-status = live

}}

{{cite web

|title=Horizons Batch for 2028-10-26 Close Approach

|publisher=JPL Horizons

|url=https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271997+XF11%27&START_TIME=%272028-10-26%2006:44%27&STOP_TIME=%272028-10-27%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27

|archive-url=https://web.archive.org/web/20230112080448/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271997+XF11%27&START_TIME=%272028-10-26%2006:44%27&STOP_TIME=%272028-10-27%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27

|archive-date=2023-01-12

|url-status=live

|accessdate=2023-01-12}} RNG_3sigma = uncertainty range in km.

{{cite web

|title = 35396 (1997 XF11)

|work = Minor Planet Center

|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=35396

|accessdate = 18 January 2018

|archive-date = 18 January 2018

|archive-url = https://web.archive.org/web/20180118064711/https://www.minorplanetcenter.net/db_search/show_object?object_id=35396

|url-status = live

}}

{{cite web

|title=Sormano Astronomical Observatory: Table of Next Closest Approaches to the Earth by Asteroids

|publisher=Astronomical Observatory of Brera

|author=Piero Sicoli

|author2=Francesco Manca

|url=http://www.brera.mi.astro.it/sormano/teca.html

|accessdate=2008-02-04

|archiveurl=https://web.archive.org/web/20071201202009/http://www.brera.mi.astro.it/sormano/teca.html

|archivedate=1 December 2007

|url-status=live

}}

{{cite web

|title = NEODyS (35396) 1997XF11 Close Approaches

|publisher = Department of Mathematics, University of Pisa, ITALY

|url = https://newton.spacedys.com/neodys/index.php?pc=1.1.8&n=1997XF11

|accessdate = 2008-02-04

|archiveurl = https://web.archive.org/web/20160303182605/http://newton.dm.unipi.it/neodys/index.php?pc=1.1.8&n=1997xf11

|archivedate = 2016-03-03

|url-status = live}}

{{cite web

|title=1997XF11 Ephemerides for 26 Oct 2028

|publisher=NEODyS (Near Earth Objects{{Snd}} Dynamic Site)

|url=https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=35396&oc=500&y0=2028&m0=10&d0=25&h0=0&mi0=0&y1=2028&m1=10&d1=28&h1=0&mi1=0&ti=1.0&tiu=hours

|accessdate=2011-10-16

|archive-date=21 April 2024

|archive-url=https://web.archive.org/web/20240421003609/https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=35396&oc=500&y0=2028&m0=10&d0=25&h0=0&mi0=0&y1=2028&m1=10&d1=28&h1=0&mi1=0&ti=1.0&tiu=hours

|url-status=live

}}

{{cite web

|date=5 April 1998

|type=last update: 3 September 1998

|title=The Asteroid Impact Scare of Mid-March 1998

|publisher=Southwest Research Institute (SwRI)

|author=Clark R. Chapman

|url=http://www.boulder.swri.edu/clark/fx11.html

|accessdate=2012-02-08

|archive-date=24 November 2020

|archive-url=https://web.archive.org/web/20201124042947/https://www.boulder.swri.edu/clark/fx11.html

|url-status=live

}}

{{cite web

|date=19 August 1999

|title=The AsteroidsComet Impact Hazard

|publisher=Southwest Research Institute (SwRI)

|author=Clark R. Chapman

|url=http://www.boulder.swri.edu/clark/ncar799.html

|accessdate=2012-02-09

|archive-date=25 November 2020

|archive-url=https://web.archive.org/web/20201125202042/https://www.boulder.swri.edu/clark/ncar799.html

|url-status=live

}}

{{cite web

|date=October 31, 2002

|title=Halloween Asteroid

|url=https://science.nasa.gov/science-news/science-at-nasa/2002/31oct_1997xf11/

|accessdate=2012-02-09

|archive-date=29 November 2011

|archive-url=https://web.archive.org/web/20111129043456/http://science.nasa.gov/science-news/science-at-nasa/2002/31oct_1997xf11/

|url-status=dead

}}

{{cite web

|title = Asteroids and comets rotation curves{{Snd}} (35396)

|last = Behrend

|first = Raoul

|publisher = Geneva Observatory

|url = http://obswww.unige.ch/~behrend/page5cou.html#035396

|accessdate = 18 January 2018

|archive-date = 19 June 2015

|archive-url = https://web.archive.org/web/20150619010828/http://obswww.unige.ch/%7Ebehrend/page5cou.html#035396

|url-status = live

}}

{{cite web

|title = LCDB Data for (35396)

|publisher = Asteroid Lightcurve Database (LCDB)

|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=35396%7C

|accessdate = 18 January 2018

|archive-date = 31 August 2020

|archive-url = https://web.archive.org/web/20200831233109/http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=35396%7C

|url-status = live

}}

{{Cite journal

|display-authors = 6

|first1 = David E. |last1 = Trilling

|first2 = Michael |last2 = Mommert

|first3 = Joseph |last3 = Hora

|first4 = Steve |last4 = Chesley

|first5 = Joshua |last5 = Emery

|first6 = Giovanni |last6 = Fazio

|first7 = Alan |last7 = Harris

|first8 = Michael |last8 = Mueller

|first9 = Howard |last9 = Smith

|date = December 2016

|title = NEOSurvey 1: Initial Results from the Warm Spitzer Exploration Science Survey of Near-Earth Object Properties

|journal = The Astronomical Journal

|volume = 152

|issue = 6

|page = 10

|bibcode = 2016AJ....152..172T

|doi = 10.3847/0004-6256/152/6/172

|arxiv= 1608.03673|s2cid = 56105212 |doi-access = free }}

{{Cite journal

|display-authors = 6

|first1 = Joseph R. |last1 = Masiero

|first2 = C. |last2 = Nugent

|first3 = A. K. |last3 = Mainzer

|first4 = E. L. |last4 = Wright

|first5 = J. M. |last5 = Bauer

|first6 = R. M. |last6 = Cutri

|first7 = T. |last7 = Grav

|first8 = E. |last8 = Kramer

|first9 = S. |last9 = Sonnett

|date = October 2017

|title = NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos

|journal = The Astronomical Journal

|volume = 154

|issue = 4

|page = 10

|bibcode = 2017AJ....154..168M

|doi = 10.3847/1538-3881/aa89ec

|arxiv = 1708.09504

|s2cid = 45334910 |doi-access = free }}

{{Cite journal

|first1 = Stephen M. |last1 = Slivan

|first2 = Emily C. |last2 = Bowsher

|first3 = Bena W. |last3 = Chang

|date = December 2002

|title = Rotation period and spin direction of near-Earth asteroid (35396) 1997 XF11

|journal = The Minor Planet Bulletin

|volume = 30

|issue = 2

|pages = 29–30

|issn = 1052-8091

|bibcode = 2003MPBu...30...29S

}}

{{Cite journal

|author = Warner, Brian D.

|date = October 2016

|title = Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 April-July

|journal = The Minor Planet Bulletin

|volume = 43

|issue = 4

|pages = 311–319

|issn = 1052-8091

|bibcode = 2016MPBu...43..311W

}}

{{Cite journal

|display-authors = 6

|first1 = Vicente Mas |last1 = Martinez

|first2 = Gonzalo Fornas |last2 = Silva

|first3 = Angel Flores |last3 = Martinez

|first4 = Alfonso Carreno |last4 = Garceran

|first5 = Enrique Arce |last5 = Mansego

|first6 = Pedro Brines |last6 = Rodriguez

|first7 = Juan Lozano |last7 = de Haro

|first8 = Alvaro Fornas |last8 = Silva

|first9 = Onofre Rodrigo |last9 = Chiner

|first10 = David Herrero |last10 = Porta

|date = October 2016

|title = Lightcurves for Two Near-Earth Asteroids by Asteroids Observers (OBAS) - MPPD: 2016 April-May

|journal = The Minor Planet Bulletin

|volume = 43

|issue = 4

|pages = 283–284

|issn = 1052-8091

|bibcode = 2016MPBu...43..283M

}}

{{Cite journal

|first1 = Petr |last1 = Pravec

|first2 = Alan W. |last2 = Harris

|first3 = Peter |last3 = Kusnirák

|first4 = Adrián |last4 = Galád

|first5 = Kamil |last5 = Hornoch

|date = September 2012

|title = Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations

|journal = Icarus

|volume = 221

|issue = 1

|pages = 365–387

|bibcode = 2012Icar..221..365P

|doi = 10.1016/j.icarus.2012.07.026

}}

{{cite journal

|display-authors = 6

|first1 = Peter |last1 = Veres

|first2 = Robert |last2 = Jedicke

|first3 = Alan |last3 = Fitzsimmons

|first4 = Larry |last4 = Denneau

|first5 = Mikael |last5 = Granvik

|first6 = Bryce |last6 = Bolin

|first7 = Serge |last7 = Chastel

|first8 = Richard J. |last8 = Wainscoat

|first9 = William S. |last9 = Burgett

|first10 = Kenneth C. |last10 = Chambers

|first11 = Heather |last11 = Flewelling

|first12 = Nick |last12 = Kaiser

|first13 = Eugen A. |last13 = Magnier

|first14 = Jeff S. |last14 = Morgan

|first15 = Paul A. |last15 = Price

|first16 = John L. |last16 = Tonry

|first17 = Christopher |last17 = Waters

|date = November 2015

|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1{{Snd}} Preliminary results

|journal = Icarus

|volume = 261

|pages = 34–47

|bibcode = 2015Icar..261...34V

|doi = 10.1016/j.icarus.2015.08.007

|arxiv = 1506.00762

|s2cid = 53493339 }}

}}

• [https://web.archive.org/web/20061003012442/http://earn.dlr.de/nea/035396.htm {{mp|1997 XF|11}}] at the European Asteroid Research Node (E.A.R.N)
• [https://web.archive.org/web/20070927074124/http://www.britastro.com/jbaa/archive/marsden.htm Brian Marsden: {{mp|1997 XF|11}}: the true story] ([http://www.britastro.com/jbaa/archive/marsden.htm Archived from the original] {{Webarchive|url=https://web.archive.org/web/20070927074124/http://www.britastro.com/jbaa/archive/marsden.htm |date=27 September 2007 }})
• [https://web.archive.org/web/20071112233908/http://spacewatch.lpl.arizona.edu/1997XF11.html Spacewatch animation] of {{mp|1997 XF|11}}{{Dead link|date=July 2017}}
• [https://web.archive.org/web/20170216215019/http://neo.jpl.nasa.gov/news/1997xf11.html Asteroid {{mp|1997 XF|11}} (Earth Close-Approach)], JPL Near-Earth Object Program
• {{NeoDys|35396}}
• {{ESA-SSA|35396|1997XF11}}
• {{JPL small body}}

{{Minor planets navigator| |number=35396 |PageName={{mp|(35396) 1997 XF|11}} |}}

{{Small Solar System bodies}}

{{Authority control}}

{{DEFAULTSORT:1997 XF11}}

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