Comet Archive

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P/2021 J3 (ATLAS)

メタデータ

項目 値
Designation P/2021 J3 (ATLAS)
Type P
Perihelion (tp_cal, UTC) 2019-07-03T16:55:29.046720Z
Orbit solution date (soln_date, UTC) 2024-03-19T12:13:27Z
Obs used 145
NEO -
M1 6.900
K1 10.750
PC -
Discovery observation (MPC, UTC) 2021-05-13T13:05:15.216000Z
Discovery magnitude (MPC) 18.64 o
Discovery observatory (MPC) T08 · ATLAS-MLO, Mauna Loa
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 2021-07-10.0000000
e 0.45076663
q (au) 4.906343
a (au) 8.933076
i (deg) 14.570678
Ω (om, deg) 111.238530
ω (w, deg) 125.692921
M (ma, deg) 27.217217

等級

P/2021 J3 (ATLAS) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (2.613 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 2.613
n 6.000
gf 1.000
gb -0.969
k 1.000
δ90 10.000
パラメータ 記号 範囲 説明
太陽・地球距離が1 AUのときの絶対等級 H0 -5 to 20 彗星の固有の明るさ
測光スロープパラメータ n 2 to 6 太陽距離に対する明るさ変化率
前方散乱非対称係数 gf 0.8 to 1 前方散乱の強さ
後方散乱非対称係数 gb -1 to -0.5 後方散乱の強さ
分配係数 k 0.8 to 1 前方/後方散乱の寄与比
ダスト/ガス明るさ比 δ90 1 to 10 ダスト散乱とガス放射の相対寄与

参考: EPSC-DPS2025-160

天体暦

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-02-03 00:00 00:49:46.66 -09:29:19.6 HIP 3995 23.53
2026-02-03 12:00 00:49:54.44 -09:27:58.2 HIP 3995 21.38
2026-02-04 00:00 00:50:02.28 -09:26:36.6 HIP 3995 19.27
2026-02-04 12:00 00:50:10.19 -09:25:14.8 HIP 3995 17.21
2026-02-05 00:00 00:50:18.16 -09:23:52.9 HIP 3995 15.23
2026-02-05 12:00 00:50:26.19 -09:22:30.8 HIP 3995 13.37
2026-02-06 00:00 00:50:34.29 -09:21:08.6 HIP 3995 11.69
2026-02-06 12:00 00:50:42.45 -09:19:46.2 HIP 3995 10.30
2026-02-07 00:00 00:50:50.66 -09:18:23.7 HIP 3995 9.34
2026-02-07 12:00 00:50:58.94 -09:17:01.0 HIP 3995 8.96
2026-02-08 00:00 00:51:07.28 -09:15:38.2 HIP 3995 9.24
2026-02-08 12:00 00:51:15.68 -09:14:15.2 HIP 3995 10.13
2026-02-09 00:00 00:51:24.14 -09:12:52.1 HIP 3995 11.51
2026-02-09 12:00 00:51:32.66 -09:11:28.9 HIP 3995 13.23
2026-02-10 00:00 00:51:41.24 -09:10:05.6 HIP 3995 15.18
2026-02-10 12:00 00:51:49.88 -09:08:42.2 HIP 3995 17.29
2026-02-11 00:00 00:51:58.57 -09:07:18.6 HIP 4146 17.97
2026-02-11 12:00 00:52:07.32 -09:05:54.9 HIP 4137 15.84
2026-02-12 00:00 00:52:16.13 -09:04:31.2 HIP 4137 13.29
2026-02-12 12:00 00:52:25.00 -09:03:07.3 HIP 4137 10.75
2026-02-13 00:00 00:52:33.92 -09:01:43.3 HIP 4137 8.22
2026-02-13 12:00 00:52:42.89 -09:00:19.3 HIP 4137 5.76
2026-02-14 00:00 00:52:51.92 -08:58:55.1 HIP 4137 3.54
2026-02-14 12:00 00:53:01.01 -08:57:30.9 HIP 4137 2.41
2026-02-15 00:00 00:53:10.15 -08:56:06.6 HIP 4137 3.63
2026-02-15 12:00 00:53:19.34 -08:54:42.2 HIP 4137 5.90
2026-02-16 00:00 00:53:28.59 -08:53:17.7 HIP 4137 8.43
2026-02-16 12:00 00:53:37.89 -08:51:53.2 HIP 4137 11.04
2026-02-17 00:00 00:53:47.24 -08:50:28.6 HIP 4257 9.63
2026-02-17 12:00 00:53:56.64 -08:49:04.0 HIP 4257 6.95
2026-02-18 00:00 00:54:06.09 -08:47:39.3 HIP 4257 4.29
2026-02-18 12:00 00:54:15.59 -08:46:14.6 HIP 4257 1.88
2026-02-19 00:00 00:54:25.15 -08:44:49.8 HIP 4257 1.91
2026-02-19 12:00 00:54:34.75 -08:43:25.0 HIP 4257 4.36
2026-02-20 00:00 00:54:44.40 -08:42:00.1 HIP 4257 7.06
2026-02-20 12:00 00:54:54.10 -08:40:35.3 HIP 4257 9.81
2026-02-21 00:00 00:55:03.84 -08:39:10.4 HIP 4257 12.58
2026-02-21 12:00 00:55:13.64 -08:37:45.5 HIP 4257 15.38
2026-02-22 00:00 00:55:23.48 -08:36:20.5 HIP 4257 18.18
2026-02-22 12:00 00:55:33.36 -08:34:55.6 HIP 4257 21.00
2026-02-23 00:00 00:55:43.29 -08:33:30.6 HIP 4257 23.83
2026-02-23 12:00 00:55:53.27 -08:32:05.7 HIP 4257 26.67
2026-02-24 00:00 00:56:03.29 -08:30:40.7 HIP 4342 28.05