2010 KZ39

2010 KZ39
分類 太陽系外縁天体[1]
軌道の種類 分離天体[2]
キュビワノ族[3]
発見
発見日 2010年5月21日[3]
発見者 ラスカンパナス天文台[3]
軌道要素と性質
元期:TDB 2456600.5 (2013年11月4.0日)[1]
軌道長半径 (a) 45.07 ± 0.09 AU[1]
近日点距離 (q) 42.5 ± 0.2 AU[1]
遠日点距離 (Q) 47.63 ± 0.09 AU[1]
離心率 (e) 0.057 ± 0.004[1]
公転周期 (P) 110517 ± 321 日
(302.6 ± 0.9 年)[1]
軌道傾斜角 (i) 026.124 ± 0.08 度[1]
近日点引数 (ω) 321 ± 3 度[1]
昇交点黄経 (Ω) 053.204 ± 0.005 度[1]
平均近点角 (M) 246 ± 3 度[1]
EMoid 41.5471 AU[1]
前回近日点通過 JED 2381180 ± 1175
(1807年頃)
次回近日点通過 JED 2491697 ± 872
(2109年頃)[1]
物理的性質
直径 697 km[4]
質量 3.55 × 1020 kg
平均密度 2.0 g/cm3（仮定）
絶対等級 (H) 4.0[1][3]
アルベド（反射能） 0.09（仮定）[4]
表面温度
最低 平均 最高
39 K[5] 41 K[5] 42 K[5]
他のカタログでの名称
2010 KZ39[3]
K10K39Z[3]
10KZ39[2]
■Template （■ノート ■解説） ■Project

2010 KZ39 とは、分離天体もしくはキュビワノ族に属する太陽系外縁天体の1つ[1][2][3]。

軌道の性質

2010 KZ39 の公転軌道は、軌道長半径は45.0AUであるが、軌道離心率は0.06しかない極めて円に近い軌道である。一方で、軌道傾斜角は26.12度と傾いている。およそ303年かけて公転しているが、近日点通過時刻は前回、次回ともに非常に大雑把にしかわかっていない[1]。キュビワノ族に分類している資料もあるが[3]、その大きな軌道傾斜角の値から分離天体という分類に分けている資料もある[2]。いずれにしても、海王星と軌道共鳴はしていないと考えられている[2]。

物理的性質

2010 KZ39 の絶対等級の値は4.0であり、これは小惑星番号が与えられていない小惑星の中では 2010 EK139 の3.8に次いで大きな値である。アルベドを0.09と仮定すると、直径は697kmという巨大な天体となる[4]。これは、自身の質量によって静水圧平衡形状になっている可能性があり、準惑星の基準を満たす可能性がある。この事により、2010 KZ39 は準惑星の候補天体に挙げられている[6]。分離天体に分類されると考えられている中では、セドナに次いで2番目に絶対等級の値が大きい[7]。また、同じアルベドの条件下で、表面温度は-231℃から-234℃の間になると考えられている[5]。平均密度を冥王星型天体に適用される2.0g/cm3と仮定すると、質量は3.55×1020kgとなる。

出典

[脚注の使い方]
  1. ^ a b c d e f g h i j k l m n o p (2010 KZ39) JPL Small-Body Database Browser
  2. ^ a b c d e Orbit Fit and Astrometric record for 10KZ39 Southwest Research Institute Planetary Science Directorate
  3. ^ a b c d e f g h 2010 KZ39 Minor Planet Center
  4. ^ a b c List of Known Trans-Neptunian Objects Johnston's Archive
  5. ^ a b c d Planet Equilibrium Temperature HEC: Calculators
  6. ^ How many dwarf planets are there in the outer solar system? (updates daily) California Institute of Technology
  7. ^ Diverse Albedos of Small Trans-Neptunian Objects arXiv

関連項目

冥王星型天体とその候補
カイパーベルト天体
散乱円盤天体
その他
小惑星帯
IAU
候補

ケンタウルス族
候補
冥王星族
IAU
候補
トゥーティノ族
候補
キュビワノ族
IAU
候補
散乱円盤天体
IAU
候補
分離天体
候補
セドノイド
候補
その他 /
未知の共鳴
IAU
候補

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