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 | 0.998 |
| gb | -0.747 |
| k | 0.836 |
| δ90 | 9.995 |
| 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 | +9.6272 | +1.324 |
| 2020-12-16 | 2021-01-12 | -35.9796 | -3.709 |
| 2021-01-12 | 2021-01-28 | +43.7428 | -0.997 |
| 2021-01-28 | 2021-03-31 | -1.4306 | -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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 10:35:54.63 | -01:36:13.5 | HIP 51919 | 12.42 |
| 2026-09-20 12:00 | 10:36:44.37 | -01:42:01.8 | HIP 51919 | 6.95 |
| 2026-09-21 00:00 | 10:37:33.93 | -01:47:49.7 | HIP 51919 | 17.81 |
| 2026-09-21 12:00 | 10:38:23.31 | -01:53:37.0 | HIP 52080 | 9.68 |
| 2026-09-22 00:00 | 10:39:12.52 | -01:59:23.8 | HIP 52080 | 10.73 |
| 2026-09-22 12:00 | 10:40:01.55 | -02:05:10.1 | HIP 52176 | 17.03 |
| 2026-09-23 00:00 | 10:40:50.40 | -02:10:55.8 | HIP 52176 | 21.35 |
| 2026-09-23 12:00 | 10:41:39.08 | -02:16:41.0 | HIP 52409 | 18.26 |
| 2026-09-24 00:00 | 10:42:27.58 | -02:22:25.7 | HIP 52409 | 12.58 |
| 2026-09-24 12:00 | 10:43:15.91 | -02:28:09.9 | HIP 52409 | 18.48 |
| 2026-09-25 00:00 | 10:44:04.06 | -02:33:53.5 | HIP 52543 | 9.31 |
| 2026-09-25 12:00 | 10:44:52.04 | -02:39:36.6 | HIP 52543 | 12.00 |
| 2026-09-26 00:00 | 10:45:39.85 | -02:45:19.2 | HIP 52669 | 20.33 |
| 2026-09-26 12:00 | 10:46:27.49 | -02:51:01.2 | HIP 52669 | 24.73 |
| 2026-09-27 00:00 | 10:47:14.95 | -02:56:42.7 | HIP 52857 | 26.80 |
| 2026-09-27 12:00 | 10:48:02.25 | -03:02:23.6 | HIP 52857 | 14.93 |
| 2026-09-28 00:00 | 10:48:49.37 | -03:08:04.1 | HIP 52857 | 8.43 |
| 2026-09-28 12:00 | 10:49:36.33 | -03:13:43.9 | HIP 52857 | 16.09 |
| 2026-09-29 00:00 | 10:50:23.12 | -03:19:23.3 | HIP 53035 | 17.40 |
| 2026-09-29 12:00 | 10:51:09.74 | -03:25:02.1 | HIP 53093 | 16.73 |
| 2026-09-30 00:00 | 10:51:56.19 | -03:30:40.3 | HIP 53093 | 9.52 |
| 2026-09-30 12:00 | 10:52:42.47 | -03:36:18.1 | HIP 53093 | 15.24 |
| 2026-10-01 00:00 | 10:53:28.59 | -03:41:55.2 | HIP 53197 | 16.39 |
| 2026-10-01 12:00 | 10:54:14.54 | -03:47:31.9 | HIP 53297 | 15.33 |
| 2026-10-02 00:00 | 10:55:00.33 | -03:53:08.0 | HIP 53297 | 17.48 |
| 2026-10-02 12:00 | 10:55:45.95 | -03:58:43.5 | HIP 53297 | 26.41 |
| 2026-10-03 00:00 | 10:56:31.40 | -04:04:18.5 | HIP 53297 | 37.51 |
| 2026-10-03 12:00 | 10:57:16.69 | -04:09:52.9 | HIP 53728 | 34.20 |
| 2026-10-04 00:00 | 10:58:01.81 | -04:15:26.8 | HIP 53728 | 23.25 |
| 2026-10-04 12:00 | 10:58:46.77 | -04:21:00.2 | HIP 53728 | 15.06 |
| 2026-10-05 00:00 | 10:59:31.57 | -04:26:32.9 | HIP 53728 | 15.04 |
| 2026-10-05 12:00 | 11:00:16.20 | -04:32:05.1 | HIP 53672 | 22.35 |
| 2026-10-06 00:00 | 11:01:00.66 | -04:37:36.8 | HIP 53672 | 31.86 |
| 2026-10-06 12:00 | 11:01:44.96 | -04:43:07.9 | HIP 54014 | 23.61 |
| 2026-10-07 00:00 | 11:02:29.10 | -04:48:38.4 | HIP 54014 | 11.82 |
| 2026-10-07 12:00 | 11:03:13.07 | -04:54:08.3 | HIP 54014 | 4.91 |
| 2026-10-08 00:00 | 11:03:56.88 | -04:59:37.7 | HIP 54072 | 6.41 |
| 2026-10-08 12:00 | 11:04:40.52 | -05:05:06.5 | HIP 54072 | 12.16 |
| 2026-10-09 00:00 | 11:05:24.00 | -05:10:34.6 | HIP 54259 | 15.35 |
| 2026-10-09 12:00 | 11:06:07.31 | -05:16:02.2 | HIP 54259 | 7.01 |
| 2026-10-10 00:00 | 11:06:50.46 | -05:21:29.2 | HIP 54259 | 12.41 |
| 2026-10-10 12:00 | 11:07:33.44 | -05:26:55.7 | HIP 54340 | 12.44 |
| 2026-10-11 00:00 | 11:08:16.26 | -05:32:21.5 | HIP 54340 | 20.08 |