141P/Machholz 2
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 141P/Machholz 2 |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-12-15T22:59:55.132800Z |
| Orbit solution date (soln_date, UTC) | 2024-08-26T12:39:49Z |
| Obs used | 852 |
| NEO | Yes |
| M1 | 17.300 |
| K1 | 4.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2019-08-01.0000000 |
| e | 0.73668750 |
| q (au) | 0.804381 |
| a (au) | 3.054854 |
| i (deg) | 13.977322 |
| Ω (om, deg) | 241.877240 |
| ω (w, deg) | 153.615394 |
| M (ma, deg) | 267.156738 |
等級
散乱 + 全体線形
$$ M_a = (16.744 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 16.744 |
| n | 2.000 |
| gf | 0.997 |
| gb | -0.748 |
| k | 0.836 |
| δ90 | 9.994 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2020-08-13 | 2020-12-15 | +9.6293 | +1.324 |
| 2020-12-16 | 2021-01-12 | -35.9795 | -3.709 |
| 2021-01-12 | 2021-01-28 | +43.7393 | -0.997 |
| 2021-01-28 | 2021-03-31 | -1.4294 | -0.971 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 23:43:08.19 | +05:09:43.3 | HIP 116917 | 21.45 |
| 2026-03-26 12:00 | 23:45:25.74 | +05:21:53.3 | HIP 117169 | 15.03 |
| 2026-03-27 00:00 | 23:47:43.85 | +05:34:03.5 | HIP 117298 | 21.74 |
| 2026-03-27 12:00 | 23:50:02.51 | +05:46:13.9 | HIP 117467 | 39.36 |
| 2026-03-28 00:00 | 23:52:21.72 | +05:58:24.3 | HIP 117900 | 38.35 |
| 2026-03-28 12:00 | 23:54:41.48 | +06:10:34.6 | HIP 117900 | 4.98 |
| 2026-03-29 00:00 | 23:57:01.80 | +06:22:44.5 | HIP 118242 | 29.30 |
| 2026-03-29 12:00 | 23:59:22.67 | +06:34:54.1 | HIP 118310 | 7.98 |
| 2026-03-30 00:00 | 00:01:44.08 | +06:47:03.1 | HIP 109 | 5.21 |
| 2026-03-30 12:00 | 00:04:06.05 | +06:59:11.5 | HIP 376 | 29.17 |
| 2026-03-31 00:00 | 00:06:28.56 | +07:11:19.0 | HIP 581 | 20.75 |
| 2026-03-31 12:00 | 00:08:51.62 | +07:23:25.5 | HIP 603 | 29.78 |
| 2026-04-01 00:00 | 00:11:15.22 | +07:35:30.9 | HIP 909 | 21.38 |
| 2026-04-01 12:00 | 00:13:39.37 | +07:47:35.0 | HIP 1103 | 24.08 |
| 2026-04-02 00:00 | 00:16:04.06 | +07:59:37.6 | HIP 1286 | 7.32 |
| 2026-04-02 12:00 | 00:18:29.28 | +08:11:38.7 | HIP 1435 | 21.65 |
| 2026-04-03 00:00 | 00:20:55.04 | +08:23:38.1 | HIP 1645 | 13.11 |
| 2026-04-03 12:00 | 00:23:21.33 | +08:35:35.6 | HIP 1816 | 9.73 |
| 2026-04-04 00:00 | 00:25:48.15 | +08:47:31.0 | HIP 1998 | 18.05 |
| 2026-04-04 12:00 | 00:28:15.49 | +08:59:24.3 | HIP 2154 | 18.48 |
| 2026-04-05 00:00 | 00:30:43.36 | +09:11:15.1 | HIP 2441 | 8.71 |
| 2026-04-05 12:00 | 00:33:11.75 | +09:23:03.5 | HIP 2639 | 14.44 |
| 2026-04-06 00:00 | 00:35:40.65 | +09:34:49.2 | HIP 2963 | 29.11 |
| 2026-04-06 12:00 | 00:38:10.06 | +09:46:32.0 | HIP 2999 | 3.29 |
| 2026-04-07 00:00 | 00:40:39.97 | +09:58:11.9 | HIP 3150 | 20.09 |
| 2026-04-07 12:00 | 00:43:10.39 | +10:09:48.6 | HIP 3424 | 8.30 |
| 2026-04-08 00:00 | 00:45:41.30 | +10:21:21.9 | HIP 3577 | 29.85 |
| 2026-04-08 12:00 | 00:48:12.70 | +10:32:51.8 | HIP 3761 | 17.42 |
| 2026-04-09 00:00 | 00:50:44.58 | +10:44:18.0 | HIP 3938 | 19.80 |
| 2026-04-09 12:00 | 00:53:16.95 | +10:55:40.5 | HIP 4221 | 14.26 |
| 2026-04-10 00:00 | 00:55:49.78 | +11:06:58.9 | HIP 4461 | 28.62 |
| 2026-04-10 12:00 | 00:58:23.08 | +11:18:13.2 | HIP 4461 | 19.73 |
| 2026-04-11 00:00 | 01:00:56.84 | +11:29:23.2 | HIP 4765 | 19.02 |
| 2026-04-11 12:00 | 01:03:31.05 | +11:40:28.8 | HIP 4884 | 16.30 |
| 2026-04-12 00:00 | 01:06:05.70 | +11:51:29.7 | HIP 5258 | 21.15 |
| 2026-04-12 12:00 | 01:08:40.79 | +12:02:25.8 | HIP 5417 | 8.34 |
| 2026-04-13 00:00 | 01:11:16.30 | +12:13:17.0 | HIP 5631 | 15.79 |
| 2026-04-13 12:00 | 01:13:52.23 | +12:24:03.1 | HIP 5631 | 23.81 |
| 2026-04-14 00:00 | 01:16:28.58 | +12:34:43.9 | HIP 6043 | 23.72 |
| 2026-04-14 12:00 | 01:19:05.32 | +12:45:19.4 | HIP 6043 | 35.04 |
| 2026-04-15 00:00 | 01:21:42.46 | +12:55:49.2 | HIP 6431 | 16.98 |
| 2026-04-15 12:00 | 01:24:19.98 | +13:06:13.3 | HIP 6558 | 11.79 |
| 2026-04-16 00:00 | 01:26:57.87 | +13:16:31.5 | HIP 6694 | 14.82 |