57P/duToit-Neujmin-Delporte
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 57P/duToit-Neujmin-Delporte |
| Type | P |
| Perihelion (tp_cal, UTC) | 2015-05-22T12:24:41.207040Z |
| Orbit solution date (soln_date, UTC) | 2025-09-10T11:27:46Z |
| Obs used | 1389 |
| NEO | - |
| M1 | 15.800 |
| 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) | 2018-03-03.0000000 |
| e | 0.49981547 |
| q (au) | 1.725627 |
| a (au) | 3.449981 |
| i (deg) | 2.848605 |
| Ω (om, deg) | 188.808603 |
| ω (w, deg) | 115.131778 |
| M (ma, deg) | 156.189430 |
等級
散乱 + 全体線形
$$ M_a = (9.577 + 4.993\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.577 |
| n | 4.993 |
| gf | 1.000 |
| gb | -0.998 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2019-12-04 | 2021-10-17 | +97.4882 | -24.758 |
| 2021-10-17 | 2023-02-09 | -17.3894 | +9.053 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 09:49:00.84 | +11:43:02.3 | HIP 48161 | 22.74 |
| 2026-06-01 12:00 | 09:49:15.26 | +11:42:02.5 | HIP 48161 | 24.03 |
| 2026-06-02 00:00 | 09:49:29.84 | +11:41:01.8 | HIP 48298 | 21.65 |
| 2026-06-02 12:00 | 09:49:44.58 | +11:40:00.1 | HIP 48298 | 19.02 |
| 2026-06-03 00:00 | 09:49:59.47 | +11:38:57.5 | HIP 48298 | 16.82 |
| 2026-06-03 12:00 | 09:50:14.52 | +11:37:53.9 | HIP 48298 | 15.24 |
| 2026-06-04 00:00 | 09:50:29.72 | +11:36:49.5 | HIP 48298 | 14.53 |
| 2026-06-04 12:00 | 09:50:45.08 | +11:35:44.1 | HIP 48298 | 14.85 |
| 2026-06-05 00:00 | 09:51:00.59 | +11:34:37.7 | HIP 48298 | 16.16 |
| 2026-06-05 12:00 | 09:51:16.25 | +11:33:30.5 | HIP 48298 | 18.27 |
| 2026-06-06 00:00 | 09:51:32.06 | +11:32:22.3 | HIP 48298 | 20.98 |
| 2026-06-06 12:00 | 09:51:48.03 | +11:31:13.2 | HIP 48298 | 24.09 |
| 2026-06-07 00:00 | 09:52:04.14 | +11:30:03.2 | HIP 48490 | 27.34 |
| 2026-06-07 12:00 | 09:52:20.40 | +11:28:52.3 | HIP 48490 | 23.83 |
| 2026-06-08 00:00 | 09:52:36.80 | +11:27:40.5 | HIP 48490 | 20.52 |
| 2026-06-08 12:00 | 09:52:53.36 | +11:26:27.7 | HIP 48490 | 17.58 |
| 2026-06-09 00:00 | 09:53:10.05 | +11:25:14.1 | HIP 48490 | 15.23 |
| 2026-06-09 12:00 | 09:53:26.90 | +11:23:59.6 | HIP 48490 | 13.82 |
| 2026-06-10 00:00 | 09:53:43.88 | +11:22:44.1 | HIP 48490 | 13.69 |
| 2026-06-10 12:00 | 09:54:01.01 | +11:21:27.8 | HIP 48490 | 14.89 |
| 2026-06-11 00:00 | 09:54:18.28 | +11:20:10.6 | HIP 48654 | 16.18 |
| 2026-06-11 12:00 | 09:54:35.70 | +11:18:52.4 | HIP 48654 | 11.74 |
| 2026-06-12 00:00 | 09:54:53.25 | +11:17:33.4 | HIP 48654 | 7.29 |
| 2026-06-12 12:00 | 09:55:10.94 | +11:16:13.5 | HIP 48654 | 2.97 |
| 2026-06-13 00:00 | 09:55:28.77 | +11:14:52.8 | HIP 48654 | 2.41 |
| 2026-06-13 12:00 | 09:55:46.74 | +11:13:31.1 | HIP 48654 | 6.71 |
| 2026-06-14 00:00 | 09:56:04.84 | +11:12:08.6 | HIP 48654 | 11.30 |
| 2026-06-14 12:00 | 09:56:23.08 | +11:10:45.2 | HIP 48654 | 15.96 |
| 2026-06-15 00:00 | 09:56:41.45 | +11:09:20.9 | HIP 48654 | 20.66 |
| 2026-06-15 12:00 | 09:56:59.96 | +11:07:55.8 | HIP 48654 | 25.41 |
| 2026-06-16 00:00 | 09:57:18.60 | +11:06:29.8 | HIP 48911 | 21.71 |
| 2026-06-16 12:00 | 09:57:37.37 | +11:05:02.9 | HIP 48911 | 16.93 |
| 2026-06-17 00:00 | 09:57:56.26 | +11:03:35.2 | HIP 48911 | 12.14 |
| 2026-06-17 12:00 | 09:58:15.29 | +11:02:06.6 | HIP 48911 | 7.42 |
| 2026-06-18 00:00 | 09:58:34.45 | +11:00:37.2 | HIP 48911 | 3.23 |
| 2026-06-18 12:00 | 09:58:53.73 | +10:59:07.0 | HIP 48911 | 3.83 |
| 2026-06-19 00:00 | 09:59:13.14 | +10:57:35.9 | HIP 48911 | 8.29 |
| 2026-06-19 12:00 | 09:59:32.67 | +10:56:04.0 | HIP 48911 | 13.18 |
| 2026-06-20 00:00 | 09:59:52.33 | +10:54:31.2 | HIP 48911 | 18.18 |
| 2026-06-20 12:00 | 10:00:12.11 | +10:52:57.6 | HIP 48911 | 23.24 |
| 2026-06-21 00:00 | 10:00:32.01 | +10:51:23.2 | HIP 48911 | 28.35 |
| 2026-06-21 12:00 | 10:00:52.03 | +10:49:48.0 | HIP 48911 | 33.50 |
| 2026-06-22 00:00 | 10:01:12.17 | +10:48:12.0 | HIP 49265 | 32.44 |