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(35396) 1997 XF11

Asteroid of the Apollo group

Field	Value
minorplanet	yes
name
background	#FFC2E0
discovery_ref
discoverer	Spacewatch
discovery_site	Kitt Peak National Obs.
discovered	6 December 1997
mpc_name
alt_names
mp_category	{{Hlist
PHA<ref name	"jpldata" /
orbit_ref
epoch	13 September 2023
(JD 2453300.5)
uncertainty	0
observation_arc	33.19 yr (12,121 days)
aphelion	2.139 AU
perihelion	0.7446 AU
time_periastron	26 June 2023
semimajor	1.442 AU
eccentricity	0.48369
period	1.73 yr (633 days)
inclination	4.0995°
asc_node	213.65°
arg_peri	103.06°
mean_anomaly	44.44°
mean_motion	/ day
moid	0.0003 AU
mean_diameter	{{Ubl
{{val	0.704	0.103	u	km}}
{{val	0.940	0.480	u	km}}
1.39 km <ref name	"lcdb" /
rotation	{{Ubl
{{val	3.252	0.002	u	h}}
{{val	3.253	0.002	u	h}}
{{val	3.2566	0.0002	ul	h}}
{{val	3.25765	0.00005	u	h}}
3.259 h<ref name	"lcdb" /
{{val	3.2591	0.0025	u	h}}
albedo	{{Ubl
0.18 <ref name	"lcdb" /
<ref name	"Trilling-2016" /
<ref name	"Masiero-2017" /
spectral_type	{{Hlist
SMASS {{	}} Xk
X<ref name	"lcdb" /
abs_magnitude	{{Ubl
16.66<ref name	"Masiero-2017" /
<ref name	"Veres-2015" /
16.77<ref name	"lcdb" /
<ref name	"lcdb" /
16.9<ref name	"jpldata" /
<ref name	"Trilling-2016" /

| Apollo | NEO | PHA (JD 2453300.5) | | | 1.39 km (derived) | | | | | 3.259 h | | 0.18 (assumed) | | | SMASS Xk | X | 16.66 | | 16.77 | | 16.9 |

**** (provisional designation ****) is a kilometer-sized asteroid, classified as a near-Earth object, Mars-crosser and potentially hazardous asteroid of the Apollo group.

Date & Time	Approach
to	Nominal distance	uncertainty
region
(3-sigma)
2028-Oct-26 06:44	Earth		± 106 km
2028-Oct-26 07:39	Moon		± 106 km

Description

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 929000 km. During the close approach, the asteroid should peak at about apparent magnitude 8.2, and will be visible in binoculars.

measures between 0.7 and 1.4 kilometers in diameter.

This asteroid also regularly comes near the large asteroid Pallas.

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." 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.

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.

References

|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

|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

|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

|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

|url-status=live

|url-status = live}}

|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

|archive-date=24 November 2020 |archive-url=https://web.archive.org/web/20201124042947/https://www.boulder.swri.edu/clark/fx11.html |url-status=live

|archive-date=25 November 2020 |archive-url=https://web.archive.org/web/20201125202042/https://www.boulder.swri.edu/clark/ncar799.html |url-status=live

|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

|archive-date = 19 June 2015 |archive-url = https://web.archive.org/web/20150619010828/http://obswww.unige.ch/%7Ebehrend/page5cou.html#035396 |url-status = live

|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

|display-authors = 6

References

. ["Twenty Years of Tracking Near-Earth Objects"](https://www.jpl.nasa.gov/news/twenty-years-of-tracking-near-earth-objects).

Info: Wikipedia Source

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