2 Pallas

2 Pallas
	litrato ng Pallas mula sa VLT-SPHERE
Pagkatuklas
Natuklasan ni	Heinrich Wilhelm Olbers
Natuklasan noong	28 Marso 1802
Designasyon
Designasyong MPC	(2) Pallas
Bigkas	/ˈpæləs/
Ipinangalan kay	Pallas Athena
Kategorya ng planetang menor	Asteroid belt (central); Pallas family
Pang-uri	Palladian ( /pæˈleɪdiən/)
Orbital characteristics
	Epoch 21 Enero 2022 (JD 2459600.5)
	Uncertainty parameter 0
Observation arc	217 taon
Aphelion	3.41 AU (510 Gm)
Perihelion	2.13 AU (319 Gm)
Semi-major axis	2.77 AU (414 Gm)
Eccentricity	0.23
Orbital period	4.613 yr (1,684.9 d)
Mean anomaly	229.5
Inclination	34.93°; (34.43° to invariable plane)
Longitude of ascending node	172.9°
Argument of perihelion	310.7°
Proper orbital elements
Proper semi-major axis	2.7709176 AU
Proper eccentricity	0.2812580
Proper inclination	33.1988686°
Proper mean motion	78.041654 deg / yr
Proper orbital period	4.61292 yr; (1684.869 d)
Precession of perihelion	−1.335344 arcsec / yr
Precession of the ascending node	−46.393342 arcsec / yr
Pisikal na katangian
Dimensiyon	c/a = 0.79±0.03; 568 ±12 km × 532 ±12 km × 448 ±12 km; 550 km × 516 km × 476 km
Mean diameter	511±4 ; 513±6 km; 512±6 km
Pang-ibabaw na sukat	(8.3±0.2)×105 km2 (2020)
Volume	(7.1±0.3)×107 km3 (2020)
Mass	(2.04±0.03)×1020 kg average est.; (2.01±0.13)×1020 kg
Mean density	2.92±0.08 g/cm3; 2.89±0.08 g/cm3; 2.57±0.19 g/cm3
Equatorial surface gravity	≈0.21 m/s2 (katamtaman); 0.022 g
Equatorial escape velocity	324 m/s
Rotation period	7.8132 h
Equatorial rotation velocity	65 m/s
Axial tilt	84°±5°
Geometric albedo	0.155; 0.159
Spectral type	B
Apparent magnitude	6.49 to 10.65
Absolute magnitude (H)	4.13
Angular diameter	0.629″ to 0.171″

Ang 2 Pallas (binibigkas na /ˈpæləs/) ay isang asteroyd na matatagpuan sa Sinturon ng asteroyd sa pagitan ng mga ligiran ng Marte at Hupiter, at ang pangalawang asteroyd na natuklasan matapos ang Ceres. Ito ay unang natuklasan noong 28 Marso 1802 ni Heinrich Wilhelm Olbers sa Bremen, at inihayag ito bilang bagong planeta.^[1] Kalaunan ay inuri ito bilang isang planetang unano matapos ang pagtuklas sa iba pang mga asteroyd noong 1845, at noong dekada 1950s ay muli itong inuri bilang isang asteroyd matapos ang realisasyon na hindi magkapareho ang pagkabuo ng mga asteroyd sa mga planeta.^[2]

Ang Pallas ay may diametro na 513±3 km. Ito ang ikatlong pinakamalaking asteroyd sa Sinturon ng asteroyd kasunod ng Vesta.^[3]^[4] Ito ay may maliwanag na kalakhan na sumasaklaw mula 6.49 hanggang 10.65, na siyang dahilan kung bakit masyado itong madilim kapag titignan gamit ang mata lamang.

Mga sanggunian

↑ Hilton, James L. "When did the asteroids become minor planets?". Astronomical Applications Department (sa wikang Ingles). US Naval Observatory. Inarkibo mula sa orihinal noong 6 Abril 2019. Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)
↑ Marsset, M, Brož, M, Vernazza, P, atbp. (2020). "The violent collisional history of aqueously evolved (2) Pallas" (PDF). Nature Astronomy. 4 (6): 569–576. Bibcode:2020NatAs...4..569M. doi:10.1038/s41550-019-1007-5. hdl:10261/237549. S2CID 212927521.{{cite journal}}: CS1 maint: date auto-translated (link)
↑ Choi, Charles Q. (11 Pebrero 2020). "Massive asteroid Pallas has a violent, cratered past, study reveals". Space.com (sa wikang Ingles). Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)
↑ Chu, Jennifer (10 Pebrero 2020). "Study reveals details of "golf ball asteroid"". Massachusetts Institute of Technology (sa wikang Ingles). Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)

[1] Hilton, James L. "When did the asteroids become minor planets?". Astronomical Applications Department (sa wikang Ingles). US Naval Observatory. Inarkibo mula sa orihinal noong 6 Abril 2019. Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)

[Marsset2020-2] Marsset, M, Brož, M, Vernazza, P, atbp. (2020). "The violent collisional history of aqueously evolved (2) Pallas" (PDF). Nature Astronomy. 4 (6): 569–576. Bibcode:2020NatAs...4..569M. doi:10.1038/s41550-019-1007-5. hdl:10261/237549. S2CID 212927521.{{cite journal}}: CS1 maint: date auto-translated (link)

[3] Choi, Charles Q. (11 Pebrero 2020). "Massive asteroid Pallas has a violent, cratered past, study reveals". Space.com (sa wikang Ingles). Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)

[4] Chu, Jennifer (10 Pebrero 2020). "Study reveals details of "golf ball asteroid"". Massachusetts Institute of Technology (sa wikang Ingles). Nakuha noong 3 Mayo 2023.{{cite web}}: CS1 maint: date auto-translated (link)

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