(349) Dembowska

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Asteroid
(349) Dembowska
Properties of the orbit ( animation )
Orbit type Main belt asteroid
Major semi-axis 2.924  AU
eccentricity 0.089
Perihelion - aphelion 2,664 AU - 3,184 AU
Inclination of the orbit plane 8.3 °
Length of the ascending node 32.5 °
Argument of the periapsis 347.6 °
Time of passage of the perihelion May 3, 2012
Sidereal period 4 a 365 d
Mean orbital velocity 17.4 km / s
Physical Properties
Medium diameter approx. 140 km
Dimensions 4.1 x 10 18Template: Infobox asteroid / maintenance / mass kg
Albedo 0.38
Medium density 2.08 g / cm³
Rotation period 4.7 h
Absolute brightness 5.9 likes
Spectral class R.
history
Explorer Auguste Charlois
Date of discovery December 9, 1892
Another name 1892 T
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(349) Dembowska is an asteroid of the main belt , which on 9 December 1892 by Auguste Charlois in Nice was discovered.

The asteroid was named after Ercole Dembowski , an Italian astronomer with Polish ancestors who did a great job researching binary star systems .

Current measurements show a mass of (4.1 ± 0.4) × 10 18 kg and a density of 2.08 ± 0.24 g cm −3 .

The orbit of (349) Dembowska is almost circular and shows a 7: 3 resonance with Jupiter . The spectrum of this asteroid shows that (349) Dembowska has meanwhile been at least partially melted. This makes (349) Dembowska an object on which the differentiation history of asteroids through melting processes can be studied.

The albedo of (349) Dembowska is given differently depending on the study, which results in a different size of the asteroid. The most commonly stated mean diameter of 140 km seems to be too small. A current study indicates the diameter as 155.8 (+7.5 / -6.2) km. Previously, a diameter of up to 217 km was assumed.

The surface temperature fluctuates between approx. 40 K and approx. 220 K and shows clear seasonal fluctuations, while an equilibrium temperature in the range between approx. 120 and approx. 150 K is reached at a depth of only 30 to 50 cm.

(349) Dembowska can already be observed visually in small telescopes in the case of the opposition . The apparent brightness fluctuates between 11.9 mag and 9.5 mag.

(349) Dembowska photographed every 100 minutes - the change in position is already clearly visible

Individual evidence

  1. ↑ Fan Li, Yanning Fu, Ye Yuan: A New Mass Determination of (349) Dembowska with Close Encounters . In: The Astronomical Journal . tape 157 , no. 5 , May 6, 2019, ISSN  1538-3881 , p. 210 , doi : 10.3847 / 1538-3881 / ab1843 .
  2. ↑ a b c d Liang Liang Yu, Bin Yang, Jianghui Ji, Wing-Huen Ip: Thermophysical characteristics of the large main-belt asteroid (349) Dembowska . In: Monthly Notices of the Royal Astronomical Society . tape 472 , no. 2 , December 1, 2017, ISSN  0035-8711 , p. 2388-2397 , doi : 10.1093 / mnras / stx2089 ( oup.com ).
  3. ↑ Asteroid 349 Dembowska (1892 T) Information | TheSkyLive.com. Retrieved June 13, 2020 .

Web links

https://theskylive.com/dembowska-info