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809 Lundia

Main-belt asteroid binary

Field	Value
minorplanet	yes
background	#D6D6D6
name	809 Lundia
image	809Lun-LB1-mag17.jpg
caption	Asteroid 809 Lundia (apparent magnitude 16.6) near a mag 15.6 star
discoverer	Max Wolf
discovered	11 August 1915
mpc_name	(809) Lundia
alt_names	1915 XP; 1936 VC
named_after	Lund Observatory
pronounced
mp_category	Main belt
epoch	31 July 2016 (JD 2457600.5)
semimajor	2.28254 AU
perihelion	1.84193 AU
aphelion	2.72316 AU
eccentricity	0.19304
period	3.45 yr (1259.6 d)
inclination	7.14911°
asc_node	154.580°
arg_peri	196.162°
mean_anomaly	76.7867°
dimensions	10.26 ± 0.07 km
mass	(9.27 ± 3.09) × 1014 kg
density	1.64 ± 0.10 g/cm3
rotation	15.4142 h
spectral_type	V
abs_magnitude	12.2
mean_motion	/ day
orbit_ref
observation_arc	100.48 yr (36700 d)
uncertainty	0

809 Lundia is a small, binary, V-type asteroid orbiting within the Flora family in the main belt. It is named after Lund Observatory, Sweden.

Characteristics

Lundia orbits within the Flora family. However, its V-type spectrum indicates that it is not genetically related to the Flora family, but rather is probably a fragment (two fragments, if its moon is included) ejected from the surface of 4 Vesta by a large impact in the past. Its orbit lies too far from Vesta for it to actually be a member of the Vesta family. It is not clear how it arrived at an orbit so far from Vesta, but other examples of V-type asteroids orbiting fairly far from their parent body are known. A mechanism of interplay between the Yarkovsky effect and nonlinear secular resonances (primarily involving Jupiter and Saturn) has been proposed.

Binary system

Lightcurve observations in 2005 revealed that Lundia is a binary system of two similarly sized objects orbiting their common centre of gravity. The satellite remains undesignated. The similarity of size between the two components is suspected because during mutual occultations the brightness drops by a similar amount independently of which component is hidden. Due to the similar size of the primary and secondary the Minor Planet Center lists this as a binary companion.{{cite web |access-date=2011-07-03 |url-status=dead |archive-url=https://web.archive.org/web/20110121153650/http://www.cbat.eps.harvard.edu/minorsats.html |archive-date=2011-01-21

Assuming an albedo similar to 4 Vesta (around 0.4) suggests that the components are about 7 km across. They orbit each other in a period of 15.4 hours, which roughly indicates that the separation between them is very close: to the order of 10–20 km if typical asteroid albedo and density values are assumed.

References

M. Florczak. (2002). "Discovering New V-Type Asteroids in the Vicinity of 4 Vesta". Icarus.
V. Carruba. (2005). "On the V-type asteroids outside the Vesta family". Astronomy & Astrophysics.
"Physical studies of asteroids at Poznan Observatory".
"809 Lundia (1915 XP)". [[NASA]]/[[Jet Propulsion Laboratory]].

Info: Wikipedia Source

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flora-asteroids discoveries-by-max-wolf named-minor-planets binary-asteroids v-type-asteroids astronomical-objects-discovered-in-1915

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