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139 Juewa

From Wikipedia, the free encyclopedia
Main-belt asteroid

139 Juewa
Discovery
Discovered byJames Craig Watson
Discovery date10 October 1874
Designations
(139) Juewa
PronunciationEnglish:/dʒuˈeɪwɑː/joo-AY-wah
Mandarin:[ɻwêɪxwǎ]
A874 TA
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc121.07 yr (44222 d)
Aphelion3.26884 AU (489.012 Gm)
Perihelion2.29261 AU (342.970 Gm)
2.78073 AU (415.991 Gm)
Eccentricity0.17553
4.64yr (1693.7d)
60.2817°
0° 12m 45.187s / day
Inclination10.9127°
1.83417°
165.566°
Physical characteristics
Dimensions148.3±4.3 km ×142.3±15.6 km
151.116±1.596 km[1]
161.43±7.38 km[2]
Mass(5.54±2.20)×1018 kg[2]
(3.262 ± 0.778/0.933)×1018 kg[3]
2.51±1.05 g/cm3[2]
1.805 ± 0.430/0.516 g/cm3[3]
0.0438 m/s²
Equatorialescape velocity
0.0828 km/s
20.991 h (0.8746 d)
0.052±0.015[1]
0.0444±0.0164[4]
Temperature~167K
CP (Tholen)[4]
8.06,[1] 7.924[4]
139 Juewa
Traditional Chinese瑞華星
Simplified Chinese瑞华星
Literal meaning"Auspicious star ofHuaxia" / "Star of China's fortune"
Transcriptions
Standard Mandarin
Hanyu PinyinRuìhuáxīng
Wade–Gilesjui4 hua2 hsing1
IPA[ɻwêɪxwǎɕíŋ]

139 Juewa (/dʒuˈeɪwɑː/joo-AY-wah) is a very large and darkmain beltasteroid. It is probably composed of primitivecarbonaceous material. It was the first asteroid discovered fromChina.

Juewa was discovered fromBeijing by the visiting AmericanastronomerJames Craig Watson on 10 October 1874; Watson was in China to observe thetransit of Venus. Watson askedPrince Gong to name the asteroid. Gong's choice was瑞華星 (roughly, "Star ofChina's fortune"). Watson used the first two characters ('star' being redundant), transliterating themJuewa inWade convention of the time. (Inpinyin,瑞華 is transliteratedruìhuá.)[5]

Multichord occultation by 139 Juewa, observed 31 August 2013 from N.S.W., Australia.

Since 1988 there have been 8 reportedstellaroccultations by Juewa. From the occultation on 31 August 2013 the best fit ellipse measures148.3±4.3 km ×142.3±15.6 km.[6]

13-cm radar observations of this asteroid from theArecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 172 km.[7] Based upon radar data, the near surface solid density of the asteroid is1.5±0.5 g/cm3.[8]

References

[edit]
  1. ^abcdYeomans, Donald K.,"139 Juewa",JPL Small-Body Database Browser,NASA Jet Propulsion Laboratory, retrieved12 May 2016.
  2. ^abcCarry, B. (December 2012), "Density of asteroids",Planetary and Space Science, vol. 73, pp. 98–118,arXiv:1203.4336,Bibcode:2012P&SS...73...98C,doi:10.1016/j.pss.2012.03.009. See Table 1.
  3. ^abFienga, A.; Avdellidou, C.; Hanuš, J. (February 2020)."Asteroid masses obtained with INPOP planetary ephemerides".Monthly Notices of the Royal Astronomical Society.492 (1).doi:10.1093/mnras/stz3407.
  4. ^abcPravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations",Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, no. 1667,Bibcode:2012LPICo1667.6089P. See Table 4.
  5. ^Schmadel, Lutz D. (2003).Dictionary of Minor Planet Names. Springer Science & Business Media. p. 28.ISBN 978-3-540-00238-3.
  6. ^"Asteroid Occultations".sbn.psi.edu. Retrieved22 June 2018.
  7. ^Ostro, S. J.; et al. (August 1985), "Mainbelt asteroids - Dual-polarization radar observations",Science, vol. 229, no. 4712, pp. 442–446,Bibcode:1985Sci...229..442O,doi:10.1126/science.229.4712.442,PMID 17738665.
  8. ^Magri, C.; et al. (December 2001), "Radar constraints on asteroid regolith compositions using 433 Eros as ground truth",Meteoritics & Planetary Science, vol. 36, no. 12, pp. 1697–1709,Bibcode:2001M&PS...36.1697M,doi:10.1111/j.1945-5100.2001.tb01857.x.

External links

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