2021 TP21

2021 TP21
分類 地球近傍天体
アポロ群
潜在的に危険な小惑星
発見
発見日 2021年10月11日[1]
発見者 レモン山サーベイ[1]
軌道要素と性質
元期:2021年7月1日（JD 2459396.5）[2]
軌道の種類 楕円軌道
軌道長半径 (a) 2.5208 au[2]
近日点距離 (q) 0.81425 au[2]
遠日点距離 (Q) 4.2274 au[2]
離心率 (e) 0.67699[2]
公転周期 (P) 4.00 年[2]
軌道傾斜角 (i) 25.404°[2]
近日点引数 (ω) 116.3°[2]
昇交点黄経 (Ω) 8.089°[2]
平均近点角 (M) 318.4°[2]
最小交差距離 地球:0.03天文単位 (4.5×10^6 km)[2]
木星:1.7天文単位 (250×10^6 km)[2]
物理的性質
直径 ~300 m[3]
240–540 m
絶対等級 (H) 20.2[2][4]
■Template （■ノート ■解説） ■Project

2021 TP21とは、地球から0.5天文単位 (75×10^6 km)離れた位置で2021年10月11日に発見されたアポフィスと同程度のサイズの小惑星である[1]。この潜在的に危険な小惑星（PHA）は、遠日点に近い位置では軌道を周回する速度が遅くなるため、公転周期の内ほとんどを太陽から4天文単位（約6億キロメートル）に近い位置で費やしている。2021 TP21は、2021年10月31日~2021年11月4日までのトリノスケール1で、2081年3月27日の潜在的な影響について評価された[3]。観測弧が長くなるにつれて、地球からの距離の公称値が潜在的な影響の日よりも遠くなった。

より長い観測弧で地球から遠ざかる名目上の接近
（2081年3月27日の仮想のインパクター）
観測弧（日） JPL Horizons
公称値の地心
（天文単位） 		不確実性領域
(3シグマ) 		影響の確率
（1インチ） 		トリノスケール
17 0.17天文単位 (25×10^6 km)[5] ±15億 km[5] 100000 0
19 1.4天文単位 (210×10^6 km)[6] ±8億7000万 km[6] 50000[3] 1[3]
57 2.5天文単位 (370×10^6 km)[7] ±1800万 km[7] 0 0

脚注

  1. ^ a b c “MPEC 2021-U10 : 2021 TP21”. IAU Minor Planet Center (2021年10月17日). 2021年11月6日閲覧。 (K21T21P)
  2. ^ a b c d e f g h i j k l m “JPL Small-Body Database Browser: (2021 TP21)”. Jet Propulsion Laboratory. 2021年11月6日閲覧。
  3. ^ a b c d “(Archive 31 October 2021): ESA Risk-List”. European Space Agency (ESA). 2021年11月6日閲覧。
  4. ^ “2021 TP21 Orbit”. Minor Planet Center. 2021年11月6日閲覧。
  5. ^ a b “JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 17 day arc”. JPL Horizons. 2021年11月6日閲覧。
  6. ^ a b “JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 19 day arc”. JPL Horizons. 2021年11月6日閲覧。
  7. ^ a b “JPL Horizons Archive: 2021 TP21 geocentric distance and uncertainty with 57 day arc”. JPL Horizons. 2021年11月6日閲覧。

外部リンク

2021年に発見された天体
主な太陽系外惑星
  • 2021年に発見された太陽系外惑星の一覧
  • 2M0437（b）
  • COCONUTS-2（b）
  • GJ 367（b）
  • GJ 486（b）
  • GJ 740（b）
  • HD 108236（f）
  • HD 129116（b）
  • HD 164922（e）
  • KOI-5A（b）
  • LTT 1445A（c）
  • NGTS-13（b）
  • NGTS-14A（b）
  • TOI-175（e・f（候補））
  • TOI-178（b・c・d・e・f・g）
  • TOI-451（b・c・d）
  • TOI-696（b・c）
  • TOI-712（b・c・d）
  • TOI-755（b・c）
  • TOI-1749（b・c・d）
  • TOI-1807（b）
  • TOI-2076（b・c・d）
  • TOI-2109（b）
  • TOI-2257（b）
  • TOI-2285（b）
  • TOI-2319（b・c）
  • YSES 2（b）
  • ケプラー1704（b）
  • ケンタウルス座α星A（b（候補））
  • ベガ（b（候補））
  • ラランド21185（c）
    • 主な小惑星
    主な衛星
    主な彗星
    その他主な発見

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