378P/McNaught
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 378P/McNaught |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-10-21T12:01:27.851520Z |
| Orbit solution date (soln_date, UTC) | 2026-01-13T08:12:54Z |
| Obs used | 828 |
| NEO | - |
| M1 | 12.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2019-03-10T03:16:12.864000Z |
| Discovery magnitude (MPC) | 21.90 G |
| Discovery observatory (MPC) | J04 · ESA Optical Ground Station, Tenerife |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-05-16.0000000 |
| e | 0.46883776 |
| q (au) | 3.380503 |
| a (au) | 6.364351 |
| i (deg) | 19.108649 |
| Ω (om, deg) | 94.516291 |
| ω (w, deg) | 194.158503 |
| M (ma, deg) | 350.270176 |
等級
散乱 + 全体線形
$$ M_a = (15.999 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.999 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.829 |
| k | 0.800 |
| δ90 | 9.999 |
| 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 |
|---|---|---|---|
| 2019-02-17 | 2020-04-05 | +16.4534 | -8.404 |
| 2021-04-03 | 2021-09-29 | -16.5663 | +11.217 |
| 2021-09-29 | 2022-12-16 | -7.7620 | +5.350 |
| 2022-12-16 | 2023-12-10 | +7.2842 | -6.122 |
| 2023-12-10 | 2024-12-28 | +3.3889 | -3.119 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 05:03:48.94 | +18:31:59.3 | HIP 23632 | 22.15 |
| 2026-02-03 12:00 | 05:03:44.05 | +18:32:25.3 | HIP 23632 | 23.25 |
| 2026-02-04 00:00 | 05:03:39.29 | +18:32:51.6 | HIP 23632 | 24.34 |
| 2026-02-04 12:00 | 05:03:34.65 | +18:33:18.0 | HIP 23632 | 25.42 |
| 2026-02-05 00:00 | 05:03:30.13 | +18:33:44.5 | HIP 23632 | 26.49 |
| 2026-02-05 12:00 | 05:03:25.75 | +18:34:11.3 | HIP 23401 | 26.68 |
| 2026-02-06 00:00 | 05:03:21.48 | +18:34:38.2 | HIP 23401 | 25.57 |
| 2026-02-06 12:00 | 05:03:17.35 | +18:35:05.4 | HIP 23401 | 24.50 |
| 2026-02-07 00:00 | 05:03:13.34 | +18:35:32.7 | HIP 23401 | 23.44 |
| 2026-02-07 12:00 | 05:03:09.46 | +18:36:00.1 | HIP 23401 | 22.42 |
| 2026-02-08 00:00 | 05:03:05.70 | +18:36:27.8 | HIP 23401 | 21.42 |
| 2026-02-08 12:00 | 05:03:02.08 | +18:36:55.6 | HIP 23401 | 20.44 |
| 2026-02-09 00:00 | 05:02:58.58 | +18:37:23.6 | HIP 23401 | 19.49 |
| 2026-02-09 12:00 | 05:02:55.21 | +18:37:51.7 | HIP 23401 | 18.56 |
| 2026-02-10 00:00 | 05:02:51.97 | +18:38:20.1 | HIP 23401 | 17.66 |
| 2026-02-10 12:00 | 05:02:48.86 | +18:38:48.6 | HIP 23401 | 16.79 |
| 2026-02-11 00:00 | 05:02:45.87 | +18:39:17.3 | HIP 23401 | 15.94 |
| 2026-02-11 12:00 | 05:02:43.02 | +18:39:46.1 | HIP 23401 | 15.12 |
| 2026-02-12 00:00 | 05:02:40.29 | +18:40:15.1 | HIP 23401 | 14.33 |
| 2026-02-12 12:00 | 05:02:37.70 | +18:40:44.3 | HIP 23401 | 13.56 |
| 2026-02-13 00:00 | 05:02:35.23 | +18:41:13.7 | HIP 23401 | 12.82 |
| 2026-02-13 12:00 | 05:02:32.90 | +18:41:43.2 | HIP 23401 | 12.11 |
| 2026-02-14 00:00 | 05:02:30.69 | +18:42:12.9 | HIP 23401 | 11.44 |
| 2026-02-14 12:00 | 05:02:28.62 | +18:42:42.8 | HIP 23401 | 10.80 |
| 2026-02-15 00:00 | 05:02:26.67 | +18:43:12.8 | HIP 23401 | 10.19 |
| 2026-02-15 12:00 | 05:02:24.86 | +18:43:43.0 | HIP 23401 | 9.62 |
| 2026-02-16 00:00 | 05:02:23.17 | +18:44:13.3 | HIP 23401 | 9.09 |
| 2026-02-16 12:00 | 05:02:21.62 | +18:44:43.8 | HIP 23401 | 8.61 |
| 2026-02-17 00:00 | 05:02:20.19 | +18:45:14.5 | HIP 23401 | 8.18 |
| 2026-02-17 12:00 | 05:02:18.90 | +18:45:45.3 | HIP 23401 | 7.80 |
| 2026-02-18 00:00 | 05:02:17.74 | +18:46:16.3 | HIP 23401 | 7.49 |
| 2026-02-18 12:00 | 05:02:16.70 | +18:46:47.4 | HIP 23401 | 7.23 |
| 2026-02-19 00:00 | 05:02:15.80 | +18:47:18.7 | HIP 23401 | 7.05 |
| 2026-02-19 12:00 | 05:02:15.03 | +18:47:50.1 | HIP 23401 | 6.94 |
| 2026-02-20 00:00 | 05:02:14.39 | +18:48:21.7 | HIP 23401 | 6.90 |
| 2026-02-20 12:00 | 05:02:13.88 | +18:48:53.4 | HIP 23401 | 6.94 |
| 2026-02-21 00:00 | 05:02:13.50 | +18:49:25.3 | HIP 23401 | 7.04 |
| 2026-02-21 12:00 | 05:02:13.25 | +18:49:57.3 | HIP 23401 | 7.22 |
| 2026-02-22 00:00 | 05:02:13.13 | +18:50:29.5 | HIP 23401 | 7.45 |
| 2026-02-22 12:00 | 05:02:13.13 | +18:51:01.8 | HIP 23401 | 7.75 |
| 2026-02-23 00:00 | 05:02:13.27 | +18:51:34.3 | HIP 23401 | 8.09 |
| 2026-02-23 12:00 | 05:02:13.54 | +18:52:06.9 | HIP 23401 | 8.48 |
| 2026-02-24 00:00 | 05:02:13.93 | +18:52:39.6 | HIP 23401 | 8.91 |