(7482) 1994 PC₁

(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]

(7482) 1994 PC₁

Orbit and positions on 1 January 2019
Discovery [1]
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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	41.97 yr (15,331 days)
Aphelion	1.7882 AU
Perihelion	0.9042 AU
Semi-major axis	1.3462 AU
Eccentricity	0.3283
Orbital period	1.56 yr (571 days)
Mean anomaly	47.475°
Mean motion	0° 37^m 51.6^s / day
Inclination	33.487°
Longitude of ascending node	117.89°
Argument of perihelion	47.625°
Earth MOID	0.0010 AU (0.4 LD)
Physical characteristics
Dimensions	1.052±0.303 km[3] 1.30 km (calculated)[4]
Rotation period	2.5999 h[5]
Geometric albedo	0.20 (assumed)[4] 0.277±0.185[3][3]
Spectral type	SMASS = S [1][4]
Absolute magnitude (H)	16.8[1][4] · 16.80±0.3[3]

Orbit and classification

1994 PC₁ orbits the Sun at a distance of 0.9–1.8 AU once every 1 years and 7 months (571 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 0.00752 AU (1,125,000 km; 699,000 mi) from Earth. On 18 January 2022, it will pass 0.01324 AU (1,981,000 km; 1,231,000 mi) from Earth.[1]

Physical characteristics

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

Rotation period

In 1998, a rotational lightcurve of 1994 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

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

On 19 January 2022, 1994 PC₁ will pass just outside of 3 lunar distances of the earth, with a peak magnitude of 7-8.

Sky trajectory with hourly 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)
		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	15.30	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≈6400 km). ^(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

As of 2018, this minor planet has not been named.[2]

References

1. "JPL Small-Body Database Browser: 7482 (1994 PC1)" (2016-09-12 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
2. "7482 (1994 PC1)". Minor Planet Center. Retrieved 2 November 2017.
3. 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.
4. "LCDB Data for (7482)". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
5. 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.

External links

• Asteroid Lightcurve Database (LCDB), query form (info)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• (7482) 1994 PC1 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• (7482) 1994 PC1 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters