astro‑ph 2020.05.18‑05.22
2020.05.18
Borysenko+, Astronomische Nachrichten – Broadband photometry of asteroid 6478 Gault: ac vity and morphology h ps://arxiv.org/pdf/2005.07270.pdf
Ac ve Asteroids(AAs): small bodies with orbits typical of asteroids that exhibit cometary ac vity (Jewi 2012) 7968 Rlst (133P/Elst) is the first AAs 2 dozens of Main Belt asteroids are resistered coma, tail by ice sublima on → Main‑Belt Comet (MBCs) but some AAs have no more signs of ac vity like 596 Scheila. the ac vity of 596 Scheila is considered as collisional result, though collisional probability is very low Gault is a Phocaea family asteroid 2019 the tail caused by YORP spin up has been found V,R‑band photometry results of Gault
2020.05.19
Or z+, The large Trans‑Neptunian Object 2002 TC302 from combined stellar occulta on, photometry and astrometry data h ps://arxiv.org/pdf/2005.08881.pdf
characteriza on of large Trans‑Neptunian Objects 2002 TC302 occulta on with m_v ~ 15.3 star occurs on 28th Jan. 2018 12 occulta on results reveal the shape 543 km mes 460 km shape model has been created combined with light curve geometric albedo was ed mated 0.147 from occulta on shape and abusolute magnitude no ring structure has been detected
Batygin & Motbidelli, Forma on of Giant Planet Satellites h ps://arxiv.org/pdf/2005.08330.pdf
numerical simula on about sa elites forma on with both gas and dust
in the circumplanetary disk (not pp‑disk) the result is consistent with the known property of Jovian and Saturnian moons (this paper result imply Nice model migra on is not necessarity needed for giant planets to get natural satellites ?)
2020.05.20
Heager, A trampoline effect occurring in the stages of planetary reseeding h ps://arxiv.org/pdf/2005.09360.pdf
lithopanspermia theory refugium hypothesis(退避仮説) reseeding stage1, 2, 3 Arimatsu+, Evidence for a rapid decrease of Pluto’s atmospheric pressure revealed by a stellar occulta on in 2019 h ps://arxiv.org/pdf/2005.09189.pdf
occulta on by Plute on 2019 July 17 using CMOS camera mounted on the Tohoku Univ. 60cm telescope in Haleakala, Hawaii brapid pressure drop is detected at a 2.4 sigma level
2020.05.21
Kaasalainen+, Asteroid models from generalised projec ons: Essen al facts for asteroid modellers and geometric inverse problem solvers h ps://arxiv.org/pdf/2005.09947.pdf
review of the problem of asteroid shape and spin various observa on about asteroids