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1987 Kaplan

Main-belt asteroid

Field	Value
minorplanet	yes
name	1987 Kaplan
background	#D6D6D6
image	File:1987Kaplan (Lightcurve Inversion).png
caption	Lightcurve-based 3D-model of Kaplan
discovery_ref
discoverer	P. F. Shajn
discovery_site	Simeiz Obs.
discovered	11 September 1952
mpc_name	(1987) Kaplan
alt_names	1952 RH
named_after	Samuil Kaplan
(Soviet astrophysicist)
mp_category	main-belt(inner)
Phocaea
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	64.54 yr (23,573 days)
aphelion	2.9234 AU
perihelion	1.8422 AU
semimajor	2.3828 AU
eccentricity	0.2269
period	3.68 yr (1,343 days)
mean_anomaly	238.97°
mean_motion	/ day
inclination	23.645°
asc_node	314.23°
arg_peri	38.176°
dimensions	km
km
km
13.89 km (calculated)
km
rotation	h
h
h
h
albedo
0.23 (assumed)

spectral_type	S (assumed)
abs_magnitude	11.4011.511.81

(Soviet astrophysicist) Phocaea km km 13.89 km (calculated) km h h h 0.23 (assumed)

1987 Kaplan, provisional designation , is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 11 September 1952, by Soviet astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Soviet astrophysicist Samuil Kaplan.

Orbit and classification

Kaplan is a member of the Phocaea family (701), a large family of stony asteroids with nearly two thousand known members.

It orbits the Sun in the inner main belt at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,343 days). Its orbit has an eccentricity of 0.23 and an inclination of 24° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Simeiz in September 1952.

Physical characteristics

Kaplan is an assumed S-type asteroid, in agreement with the overall spectral type of the Phocaea family.

Rotation period

Between 2000 and 2011, three rotational lightcurves of Kaplan were obtained from photometric observations by astronomer Brian Warner at his Palmer Divide Observatory in Colorado, United States. Lightcurve analysis gave a well-defined rotation period between 9.453 and 9.49 hours with a brightness amplitude from 0.46 to 0.65 magnitude ().

Poles

In addition a modeled lightcurve, using photometric data from various sources, gave a concurring period of 9.45950 hours and determined two spin axis of (356.0°, −58.0°) and (233.0°, −89.0°) in ecliptic coordinates.

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kaplan measures between 11.70 and 14.606 kilometers in diameter and its surface has an albedo between 0.2094 and 0.28.

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 – derived from 25 Phocaea, the family's parent body and namesake, and calculates a diameter of 13.89 kilometers based on an absolute magnitude of 11.5.

Naming

This minor planet was named after Samuil Kaplan (1921–1978), Soviet astronomer and astrophysicist at Lvov University Observatory (067), Ukraine, and at the Radiophysical Research Institute in Nizhny Novgorod (formerly known as Gorky), Russia. His research included a variety of astrophysical fields, such as white dwarfs, interstellar matter, radiative transfer, solar radiation, pulsars and galactic nuclei.

The official naming citation was published by the Minor Planet Center on 1 June 1980 (M.P.C. 5358).

Notes

References

Info: Wikipedia Source

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phocaea-asteroids discoveries-by-pelageya-shajn named-minor-planets astronomical-objects-discovered-in-1952

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