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5222 Ioffe
	Rotating frame animation in reference to Jupiter. Each frame 81 years.
Discovery
Discovered by	N. S. Chernykh
Discovery site	Crimean Astrophysical Obs.
Discovery date	11 October 1980
Designations
MPC designation	(5222) Ioffe
Named after	Abram Ioffe; (Soviet physicist)
Alternative designations	1980 TL13 · 1978 LP; 1989 TG1
Minor planet category	main-belt · (middle); Pallas
Orbital characteristics
	Epoch 16 February 2017 (JD 2457800.5)
	Uncertainty parameter 0
Observation arc	64.08 yr (23,405 days)
Aphelion	3.1728 AU
Perihelion	2.3788 AU
Semi-major axis	2.7758 AU
Eccentricity	0.1430
Orbital period (sidereal)	4.62 yr (1,689 days)
Mean anomaly	172.25°
Mean motion	0° 12m 47.16s / day
Inclination	34.539°
Longitude of ascending node	220.66°
Argument of perihelion	331.02°
Physical characteristics
Dimensions	17.989±0.093 km; 21.73 km
Synodic rotation period	19.4 h
Geometric albedo	0.1031; 0.1463±0.012; 0.202±0.041
Spectral type	B (SMASSII)
Absolute magnitude (H)	11.4

5222 Ioffe, provisional designation 1980 TL₁₃, is a rare-type carbonaceous Palladian asteroid from the central region of the asteroid belt, approximately 18 kilometers in diameter. It was discovered on 11 October 1980, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj, Crimea.^[3] It is the largest of the Palladian asteroids apart from Pallas itself.

Classification and orbit

Rotating frame animation in reference to Pallas, showing how Ioffe is in the group with the obvious 1:1 resonance.

Ioffe is a member of the Pallas family (801), a small, carbonaceous asteroid family in the central main-belt.^[4]^[7]^: 23

It orbits the Sun at a distance of 2.4–3.2 AU once every 4 years and 7 months (1,689 days). Its orbit has an eccentricity of 0.14 and an inclination of 35° with respect to the ecliptic.^[1] A first precovery was taken at Palomar Observatory in 1952, extending the asteroid's observation arc by 28 years prior to its official discovery observation at Nauchnyj.^[3]

Physical characteristics

In the SMASS classification Ioffe is a carbonaceous B-type asteroid, in line with the overall spectral type of the Palladian asteroids.^[1]^[7]^: 23

Photometric observations of this asteroid collected during 2006 show a rotation period of 19.4 ± 0.2 hours with a brightness variation of 0.27 ± 0.03 magnitude.^[8]

Naming

This minor planet was named in memory of Soviet physicist Abram Ioffe (1880–1960), an expert in electromagnetism, radiology, crystals, high-impact physics, thermoelectricity and photoelectricity. Ioffe was a pioneer in the investigation of semiconductors. Proposed by the Institute of Theoretical Astronomy, naming citation was published on 5 March 1996 (M.P.C. 26763).^[2]^[9]

References

^ ^a ^b ^c ^d ^e ^f ^g "JPL Small-Body Database Browser: 5222 Ioffe (1980 TL13)" (2017-01-09 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 March 2017. Retrieved 20 March 2017.
^ ^a ^b Schmadel, Lutz D. (2007). "(5222) Ioffe". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 448. doi:10.1007/978-3-540-29925-7_5056. ISBN 978-3-540-00238-3.
^ ^a ^b ^c "5222 Ioffe (1980 TL13)". Minor Planet Center. Retrieved 20 March 2017.
^ ^a ^b "Asteroid 5222 Ioffe – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
^ ^a ^b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 20 March 2017.
^ ^a ^b ^c "LCDB Data for (5222) Ioffe". Asteroid Lightcurve Database (LCDB). Retrieved 20 March 2017.
^ ^a ^b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
^ Warner, Brian D. (December 2006), "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006", The Minor Planet Bulletin, 33 (4): 85–88, Bibcode:2006MPBu...33...85W.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 March 2017.