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(Top) 1 Orbit and classification 2 Physical characteristics 2.1 Rotation period 2.2 Diameter and albedo 3 2022 flyby 4 Naming 5 See also 6 Notes 7 References 8 External links

(7482) 1994 PC₁

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(7482) 1994 PC₁
Discovery^[1]
Orbit with positions Jan 2020
Discovered by	R. H. McNaught
Discovery site	Siding Spring Obs.
Discovery date	9 August 1994
Designations
MPC designation	(7482) 1994 PC₁
Alternative designations	1994 PC₁
Minor planet category	Apollo · NEO · PHA^[1]^[2]
Orbital characteristics^[1]
Epoch 2022-Jan-21 (JD 2459600.5)
Uncertainty parameter 0
Observation arc	47.23 yr (17,251 days)
Earliest precovery date	22 September 1974
Aphelion	1.7935 AU
Perihelion	0.9042 AU
Semi-major axis	1.3488 AU
Eccentricity	0.3297
Orbital period (sidereal)	1.56 yr (572 days)
Mean anomaly	337.27°
Mean motion	0° 37^m 51.6^s / day
Inclination	33.479°
Longitude of ascending node	117.88°
Argument of perihelion	47.477°
Earth MOID	0.00054 AU (0.21 LD)
Mars MOID	0.139 AU (20.8 million km)^[2]
Physical characteristics
Mean diameter	1.052±0.303km^[3] 1.30 km (calculated)^[4]
Synodic rotation period	2.5999 h^[5]
Geometric albedo	0.277±0.185^[3] 0.20 (assumed)^[4]
Spectral type	SMASS = S^[1]^[4]
Absolute magnitude (H)	16.6^[1]^[4] · 16.80±0.3^[3]

(7482) 1994 PC₁ is a stony asteroid, classified as near-Earth object and potentially hazardous asteroid of 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.^[2] With an observation arc of 47 years it has a very well known orbit and was observed by Goldstone radar in January 1997.^[6] The 2022 approach has been observed every month since August 2021.^[2]

Orbit and classification

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1994 PC₁ 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.^[1]

On 17 January 1933, it passed 811,350 km (504,150 mi) from the Moon and then about an hour later made its closest known approach to Earth of 1,125,400 km (699,300 mi).^[1] On 18 January 2022, it passed about 1,981,468 km (1,231,227 mi) from Earth.^[1]

Close approaches^[1]
Date	JPL SBDB nominal geocentric distance	uncertainty region (3-sigma)
1933-01-17	1125383 km	± 65 km^[a]
2022-01-18	1981468 km	± 47 km^[7]
2105-01-18	2328125 km	± 1069 km^[8]

Physical characteristics

[edit]

In the SMASS classification, 1994 PC₁ is a common stony S-type asteroid.^[1]^[4]

Rotation period

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In 1998, a rotational lightcurveof1994 PC₁ 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 (U=3).^[5]

Diameter and albedo

[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1994 PC₁ measures 1.052 kilometers in diameter and its surface has an albedo of 0.277.^[3] 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.^[4]

2022 flyby

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At 18 January 2022 21:51 UTC, 1994 PC₁ passed 5.15 lunar distances from Earth^[1] and had a 3-sigma uncertainty region of less than ± 50 km.^[7] It peaked at an apparent magnitude of about 10^[9] 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.

2022 Moon/Earth approach
Date & Time	Approach to	Nominal distance
2022-01-18 18:58	Moon	2085780 km^[10]
2022-01-18 21:51	Earth	1981468 km^[1]

Animation of 1994 PC1 - 2022 close approach
Sun · Earth · 1994 PC₁

Sky trajectory with daily motion

History of close approaches of large near-Earth objects since 1908 ^(A)

PHA	Date	Approach distance (lunar dist.)			Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
PHA	Date	Nomi- nal^(B)	Mini- mum	Maxi- mum	Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
(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 lunar distances (LD) of objects with H brighter than 18. ^(B) Nominal geocentric distance from the Earth's center to the object's center (Earth radius≈0.017 LD). ^(C) Diameter: estimated, theoretical mean-diameter based on H and albedo range between X and Y. ^(D) Reference: data source from the JPL SBDB, with AU converted into LD (1 AU≈390 LD) ^(E) Color codes: unobserved at close approach observed during close approach upcoming approaches

Naming

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As of 2022, this minor planet has not been named.^[2]

Notes

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^ The 1933 approach is better constrained than the 2105 approach as a result of the 1974, 1977, 1980 precovery images of the asteroid.^[2]

References

[edit]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l "JPL Small-Body Database Browser: 7482 (1994 PC1)" (Under "Distance Units" select km for more sig figs). Jet Propulsion Laboratory. Retrieved 12 January 2022.

^ ^a ^b ^c ^d ^e ^f "7482 (1994 PC1)". Minor Planet Center. Retrieved 12 January 2022.

^ ^a ^b ^c ^d Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Cutri, R. M.; McMillan, R. S.; et al. (November 2012). "Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey". The Astrophysical Journal Letters. 760 (1): 6. arXiv:1210.0502. Bibcode:2012ApJ...760L..12M. doi:10.1088/2041-8205/760/1/L12. S2CID 41459166.

^ ^a ^b ^c ^d ^e ^f "LCDB Data for (7482)". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.

^ ^a ^b Pravec, Petr; Wolf, Marek; Sarounová, Lenka (November 1998). "Lightcurves of 26 Near-Earth Asteroids". Icarus. 136 (1): 124–153. Bibcode:1998Icar..136..124P. doi:10.1006/icar.1998.5993.

^ "Asteroid Radar History". Jet Propulsion Laboratory. Retrieved 12 January 2022.