C/1982 M1 (Austin)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1982 M1 (Austin) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1982-08-24T17:30:18.077760Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:29Z |
| Obs used | 290 |
| NEO | - |
| M1 | 9.000 |
| K1 | 15.250 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1982-09-05.0000000 |
| e | 0.99939617 |
| q (au) | 0.647812 |
| a (au) | 1072.840846 |
| i (deg) | 84.494983 |
| Ω (om, deg) | 326.262542 |
| ω (w, deg) | 33.822836 |
| M (ma, deg) | 0.000316 |
等級
散乱 + 全体線形
$$ M_a = (7.940 + 3.398\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 7.940 |
| n | 3.398 |
| gf | 0.800 |
| gb | -0.593 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 1982-06-18 | 1982-07-10 | +7.1796 | -0.282 |
| 1982-07-10 | 1982-08-06 | -6.0673 | -0.023 |
| 1982-08-06 | 1982-08-24 | +9.1400 | +2.618 |
| 1982-08-24 | 1982-09-21 | -3.7033 | -0.749 |
| 1982-09-21 | 1982-11-21 | +3.7455 | -0.223 |
| 1982-11-21 | 1983-04-02 | +12.0937 | -2.471 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 09:30:54.04 | -09:01:17.5 | HIP 46801 | 24.95 |
| 2026-07-29 12:00 | 09:30:55.59 | -09:01:22.5 | HIP 46801 | 24.71 |
| 2026-07-30 00:00 | 09:30:57.14 | -09:01:27.6 | HIP 46801 | 24.47 |
| 2026-07-30 12:00 | 09:30:58.69 | -09:01:32.8 | HIP 46801 | 24.24 |
| 2026-07-31 00:00 | 09:31:00.25 | -09:01:38.1 | HIP 46801 | 24.01 |
| 2026-07-31 12:00 | 09:31:01.81 | -09:01:43.5 | HIP 46801 | 23.79 |
| 2026-08-01 00:00 | 09:31:03.37 | -09:01:48.9 | HIP 46801 | 23.57 |
| 2026-08-01 12:00 | 09:31:04.94 | -09:01:54.5 | HIP 46801 | 23.36 |
| 2026-08-02 00:00 | 09:31:06.50 | -09:02:00.2 | HIP 46801 | 23.15 |
| 2026-08-02 12:00 | 09:31:08.08 | -09:02:05.9 | HIP 46801 | 22.95 |
| 2026-08-03 00:00 | 09:31:09.65 | -09:02:11.8 | HIP 46801 | 22.76 |
| 2026-08-03 12:00 | 09:31:11.22 | -09:02:17.8 | HIP 46801 | 22.57 |
| 2026-08-04 00:00 | 09:31:12.80 | -09:02:23.8 | HIP 46801 | 22.39 |
| 2026-08-04 12:00 | 09:31:14.38 | -09:02:29.9 | HIP 46801 | 22.21 |
| 2026-08-05 00:00 | 09:31:15.96 | -09:02:36.2 | HIP 46801 | 22.04 |
| 2026-08-05 12:00 | 09:31:17.54 | -09:02:42.5 | HIP 46801 | 21.88 |
| 2026-08-06 00:00 | 09:31:19.13 | -09:02:48.9 | HIP 46801 | 21.73 |
| 2026-08-06 12:00 | 09:31:20.71 | -09:02:55.4 | HIP 46801 | 21.58 |
| 2026-08-07 00:00 | 09:31:22.30 | -09:03:02.0 | HIP 46801 | 21.44 |
| 2026-08-07 12:00 | 09:31:23.89 | -09:03:08.7 | HIP 46801 | 21.31 |
| 2026-08-08 00:00 | 09:31:25.48 | -09:03:15.5 | HIP 46801 | 21.19 |
| 2026-08-08 12:00 | 09:31:27.07 | -09:03:22.3 | HIP 46801 | 21.07 |
| 2026-08-09 00:00 | 09:31:28.67 | -09:03:29.3 | HIP 46801 | 20.97 |
| 2026-08-09 12:00 | 09:31:30.26 | -09:03:36.3 | HIP 46801 | 20.87 |
| 2026-08-10 00:00 | 09:31:31.85 | -09:03:43.5 | HIP 46801 | 20.78 |
| 2026-08-10 12:00 | 09:31:33.45 | -09:03:50.7 | HIP 46801 | 20.70 |
| 2026-08-11 00:00 | 09:31:35.05 | -09:03:58.0 | HIP 46801 | 20.63 |
| 2026-08-11 12:00 | 09:31:36.64 | -09:04:05.4 | HIP 46801 | 20.57 |
| 2026-08-12 00:00 | 09:31:38.24 | -09:04:12.9 | HIP 46801 | 20.52 |
| 2026-08-12 12:00 | 09:31:39.84 | -09:04:20.5 | HIP 46801 | 20.48 |
| 2026-08-13 00:00 | 09:31:41.44 | -09:04:28.2 | HIP 46801 | 20.44 |
| 2026-08-13 12:00 | 09:31:43.03 | -09:04:35.9 | HIP 46801 | 20.42 |
| 2026-08-14 00:00 | 09:31:44.63 | -09:04:43.7 | HIP 46801 | 20.41 |
| 2026-08-14 12:00 | 09:31:46.23 | -09:04:51.7 | HIP 46801 | 20.41 |
| 2026-08-15 00:00 | 09:31:47.82 | -09:04:59.7 | HIP 46801 | 20.41 |
| 2026-08-15 12:00 | 09:31:49.42 | -09:05:07.7 | HIP 46801 | 20.43 |
| 2026-08-16 00:00 | 09:31:51.02 | -09:05:15.9 | HIP 46801 | 20.46 |
| 2026-08-16 12:00 | 09:31:52.61 | -09:05:24.2 | HIP 46801 | 20.49 |
| 2026-08-17 00:00 | 09:31:54.21 | -09:05:32.5 | HIP 46801 | 20.54 |
| 2026-08-17 12:00 | 09:31:55.80 | -09:05:40.9 | HIP 46801 | 20.59 |
| 2026-08-18 00:00 | 09:31:57.39 | -09:05:49.4 | HIP 46801 | 20.66 |
| 2026-08-18 12:00 | 09:31:58.99 | -09:05:58.0 | HIP 46801 | 20.73 |
| 2026-08-19 00:00 | 09:32:00.58 | -09:06:06.6 | HIP 46801 | 20.82 |