Scheeres et al. (2020)「小惑星Bennuの中身どうなってんの」論文 https://t.co/efZhVKS5pi #今日読んだ惑星科学のやつ Bennuを周回するOSIRIS-REx探査機と天体表面から放出された粒子の追跡から、重力場を測定した。
Gravity fields, density distribution, surface variations... There are a lot of factors to take into account when analyzing asteroids, which is why they often use multiple models. https://t.co/lz2nCypiH8
"The distribution of a planetary body’s mass is a fundamental physical property that defines its current physical state, which can provide insight into its past, and serves as a geophysical basis for other investigations." https://t.co/IQQG06qk0X
"Comparisons with a constant-density shape model show that [asteroid] Bennu has a heterogeneous mass distribution." https://t.co/raF8MkQeKi
Sadly, you can't use a balance to measure asteroids. It takes a lot work (and math) to learn more about an asteroid like Bennu: https://t.co/ei0vHdorbd
500mサイズの小惑星ベヌーの赤道部と中心部は密度が低いらしい。探査機オサイレス・レックスによる重力場測定から。平均密度は約1.2g/cm3。そうした密度分布は速い自転や表面物質の移動によるものだろうか。https://t.co/ZjrWMZ1bFM https://t.co/cc1dF8XEO5 関連:https://t.co/Nn2979CB7b
@PayloadWrangler On the other hand, gravity data from @OSIRISREx indicates that it might be *less* dense on the inside, or weirdly heterogenous https://t.co/FFuaTEkUZa
ラブルパイル小惑星の不均一な質量分布(101955)ベンヌ https://t.co/mKmtFQmNAF https://t.co/lc5srPOFP6 #サイエンス誌
6. Heterogeneous mass distribution of the rubble-pile asteroid (101955) Bennu - Daniel Scheeres et al https://t.co/0ubnZJDPC2
RT @scipak_es: 6 estudios presentan resultados de la nave espacial OSIRIS-REx y revelan conocimientos sobre el asteroide cercano a la Tierr…
6 estudios presentan resultados de la nave espacial OSIRIS-REx y revelan conocimientos sobre el asteroide cercano a la Tierra Bennu https://t.co/V8WuqdAavt https://t.co/Arpntkf45L https://t.co/r8MGyFmXG1 https://t.co/Wn5N0s5Zfn https://t.co/Pplzzhdr1K
@ScienceMagazine @ScienceAdvances @OSIRISREx @hkaplanet Daniel Scheeres et al. measure Bennu's gravitational field, from which they infer its internal structure. The centre and equator of the asteroid have a lower density than average, indicating Bennu use
ScienceMagazine: https://t.co/fTtfQy7miI @ScienceAdvances
RT @ScienceMagazine: https://t.co/bNUfSQHNAF @ScienceAdvances
RT @ScienceMagazine: https://t.co/bNUfSQHNAF @ScienceAdvances
https://t.co/bNUfSQHNAF @ScienceAdvances
RT @cosmos4u: Heterogeneous mass distribution of / Hemispherical differences in the shape and topography of asteroid (101955) Bennu / Bennu…
Heterogeneous mass distribution of / Hemispherical differences in the shape and topography of asteroid (101955) Bennu / Bennu’s weak boulders and thermally anomalous equator: https://t.co/tvvNawroPc / https://t.co/GAhr8oylqR / https://t.co/rA76c5F5mB ->