677 Aaltje

677 Aaltje is a main-belt minor planet orbiting the Sun, discovered by August Kopff at Heidelberg on January 18, 1909. It was named after the Dutch singer Aaltje Noordewier-Reddingius.

677 Aaltje
Discovery
Discovered byAugust Kopff
Discovery siteHeidelberg
Discovery date18 January 1909
Designations
(677) Aaltje
1909 FR
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc109.68 yr (40062 d)
Aphelion3.1092 AU (465.13 Gm)
Perihelion2.8043 AU (419.52 Gm)
2.9568 AU (442.33 Gm)
Eccentricity0.051565
5.08 yr (1857.1 d)
349.034°
0° 11m 37.86s / day
Inclination8.4812°
272.799°
276.733°
Physical characteristics
Mean radius
14.435±0.85 km
16.608 h (0.6920 d)[1]
0.2794±0.037[1]
9.6[1]

    This object has a geometric albedo of 0.2794. Photometric observations during 2008 showed a rotation period of 16.6076 ± 0.0006 hours and a brightness variation of 0.30 ± 0.02 in magnitude.[2]

    677 Aaltje is orbiting within the 7/3 Kirkwood gap. This means it has a 7:3 orbital resonance with Jupiter, completing seven orbits for every three orbits of the planet. For smaller objects, this would typically lead to orbital instability, causing it to shift to a different orbital period. However, 677 Aaltje is too large for its orbit to have been moved by more than about 0.01 AU over the lifetime of the Solar System. What is more likely is that orbital interactions with the dwarf planet Ceres may have shifted it to the present-day orbit—the orbit of 677 Aaltje leads it into relatively close encounters with Ceres.[3]

    References
    1. "JPL Small-Body Database Browser: 677 Aaltje (1909 FR)". Jet Propulsion Laboratory. Retrieved 7 May 2016.
    2. Oey, Julian (October 2009), "Lightcurve Analysis of Asteroids from Leura and Kingsgrove Observatory in the Second Half of 2008", The Minor Planet Bulletin, 36 (4): 162–164, Bibcode:2009MPBu...36..162O
    3. Tsiganis, K.; Varvoglis, H.; Morbidelli, A. (November 2003), "Short-lived asteroids in the 7/3 Kirkwood gap and their relationship to the Koronis and Eos families", Icarus, 166 (1): 131–140, Bibcode:2003Icar..166..131T, doi:10.1016/j.icarus.2003.08.007


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