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(7482) 1994 PC1

Near-Earth asteroid January 2022

Field	Value
minorplanet	yes
name
background	#FFC2E0
image	1994-PC1-orbit.png
caption	Orbit with positions Jan 2020
discovery_ref
discoverer	R. H. McNaught
discovery_site	Siding Spring Obs.
discovered	9 August 1994
mpc_name	(7482)
alt_names
named_after
mp_category	ApolloNEOPHA
orbit_ref
epoch	2022-Jan-21 (JD 2459600.5)
uncertainty	0
observation_arc	47.23 yr (17,251 days)
earliest_precovery_date	22 September 1974
aphelion	1.7935 AU
perihelion	0.9042 AU
semimajor	1.3488 AU
eccentricity	0.3297
period	1.56 yr (572 days)
mean_anomaly	337.27°
mean_motion	/ day
inclination	33.479°
asc_node	117.88°
arg_peri	47.477°
moid	0.00054 AU
mars_moid	0.139 AU
mean_diameter	km
1.30 km (calculated)
rotation	h
albedo
0.20 (assumed)
spectral_type	SMASS S
abs_magnitude	16.6

1.30 km (calculated) 0.20 (assumed)

**** is a stony asteroid and near-Earth object, currently estimated to be the most potentially hazardous asteroid over the next 1000 years. It is in the Apollo group, approximately 1.1 kilometers in diameter. It was discovered on 9 August 1994, by astronomer Robert McNaught at the Siding Spring Observatory in Coonabarabran, Australia. With an observation arc of 47 years it has a very well known orbit and was observed by Goldstone radar in January 1997.

Of all the known asteroids larger than 1 km, has the largest probability of a "deep close encounter" with Earth over the next 1000 years. It has a close encounter with Earth in 2525, after which the uncertainty of its orbit increases.

Orbit and classification

orbits the Sun at a distance of 0.9–1.8 AU once every 1 years and 7 months (572 days). Its orbit has an eccentricity of 0.33 and an inclination of 33° with respect to the ecliptic.

On 17 January 1933, it passed 811350 km from the Moon and then about an hour later made its closest known approach to Earth of 1125400 km. On 18 January 2022, it passed about 1981468 km from Earth.

Date	JPL SBDB
nominal geocentric
distance	uncertainty
region
([3-sigma](3-sigma))
1933-01-17		± 65 km
2022-01-18		± 47 km
2105-01-18		± 1069 km

Physical characteristics

In the SMASS classification, is a common stony S-type asteroid.

Rotation period

In 1998, a rotational lightcurve of was obtained from photometric observations by Petr Pravec. Lightcurve analysis gave a well-defined rotation period of 2.5999 hours with a brightness amplitude of 0.29 magnitude ().

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, measures 1.052 kilometers in diameter and its surface has an albedo of 0.277. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 1.30 kilometers based on an absolute magnitude of 16.8.

2022 flyby

At 18 January 2022 21:51 UTC, passed 5.15 lunar distances from Earth and had a 3-sigma uncertainty region of less than ± 50 km. It peaked at an apparent magnitude of about 10 placing it just outside the reach of common 7×50 binoculars. The nearly full moon being about 100 degrees from the asteroid during closest approach may have made it more difficult to observe with smaller telescopes.

Date & Time	Approach
to	Nominal distance
2022-01-18 18:58	Moon
2022-01-18 21:51	Earth

[[File:1994 PC1 skypath 2022.png	500px]]

Naming

As of 2022, this minor planet has not been named.

Notes

References

Carter, Jamie. (May 29, 2023). "We Are (Probably) Safe From Asteroids For 1,000 Years, Say Scientists".
(2023-06-12). "The Hazardous km-sized NEOs of the Next Thousands of Years". The Astronomical Journal.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

apollo-asteroids discoveries-by-robert-h.-mcnaught potentially-hazardous-asteroids s-type-asteroids-(smass) near-earth-objects-in-2022 astronomical-objects-discovered-in-1994

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