C/1973 E1 (Kohoutek)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1973 E1 (Kohoutek) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1973-12-28T10:20:11.054400Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:22Z |
| Obs used | 812 |
| NEO | - |
| M1 | 5.800 |
| K1 | 9.000 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1973-12-06.0000000 |
| e | 1.00000781 |
| q (au) | 0.142425 |
| a (au) | -18236.507048 |
| i (deg) | 14.304145 |
| Ω (om, deg) | 258.489491 |
| ω (w, deg) | 37.797569 |
| M (ma, deg) | -0.000009 |
等級
散乱 + 全体線形
$$ M_a = (6.623 + 3.235\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.623 |
| n | 3.235 |
| gf | 0.800 |
| gb | -0.633 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 1973-01-28 | 1973-05-13 | +16.7992 | -9.089 |
| 1973-05-13 | 1973-10-27 | +2.0895 | -0.432 |
| 1973-10-27 | 1973-12-11 | +1.8010 | -0.605 |
| 1973-12-11 | 1973-12-22 | -4.2228 | -1.803 |
| 1974-01-03 | 1974-01-31 | -1.4588 | -0.127 |
| 1974-01-31 | 1974-02-24 | +4.7312 | +0.049 |
| 1974-02-24 | 1974-03-23 | +12.3726 | -1.280 |
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 | 07:25:22.70 | +14:17:42.4 | HIP 36078 | 15.02 |
| 2026-07-29 12:00 | 07:25:24.15 | +14:17:38.5 | HIP 36078 | 14.75 |
| 2026-07-30 00:00 | 07:25:25.59 | +14:17:34.6 | HIP 36078 | 14.48 |
| 2026-07-30 12:00 | 07:25:27.03 | +14:17:30.6 | HIP 36078 | 14.21 |
| 2026-07-31 00:00 | 07:25:28.46 | +14:17:26.7 | HIP 36078 | 13.95 |
| 2026-07-31 12:00 | 07:25:29.89 | +14:17:22.7 | HIP 36078 | 13.70 |
| 2026-08-01 00:00 | 07:25:31.32 | +14:17:18.7 | HIP 36078 | 13.45 |
| 2026-08-01 12:00 | 07:25:32.74 | +14:17:14.7 | HIP 36078 | 13.20 |
| 2026-08-02 00:00 | 07:25:34.16 | +14:17:10.6 | HIP 36078 | 12.96 |
| 2026-08-02 12:00 | 07:25:35.58 | +14:17:06.6 | HIP 36078 | 12.72 |
| 2026-08-03 00:00 | 07:25:36.99 | +14:17:02.5 | HIP 36078 | 12.49 |
| 2026-08-03 12:00 | 07:25:38.39 | +14:16:58.5 | HIP 36078 | 12.27 |
| 2026-08-04 00:00 | 07:25:39.79 | +14:16:54.4 | HIP 36078 | 12.05 |
| 2026-08-04 12:00 | 07:25:41.19 | +14:16:50.3 | HIP 36078 | 11.84 |
| 2026-08-05 00:00 | 07:25:42.58 | +14:16:46.2 | HIP 36078 | 11.63 |
| 2026-08-05 12:00 | 07:25:43.97 | +14:16:42.0 | HIP 36078 | 11.43 |
| 2026-08-06 00:00 | 07:25:45.35 | +14:16:37.9 | HIP 36078 | 11.24 |
| 2026-08-06 12:00 | 07:25:46.73 | +14:16:33.7 | HIP 36078 | 11.06 |
| 2026-08-07 00:00 | 07:25:48.10 | +14:16:29.5 | HIP 36078 | 10.88 |
| 2026-08-07 12:00 | 07:25:49.47 | +14:16:25.4 | HIP 36078 | 10.72 |
| 2026-08-08 00:00 | 07:25:50.83 | +14:16:21.2 | HIP 36078 | 10.56 |
| 2026-08-08 12:00 | 07:25:52.19 | +14:16:17.0 | HIP 36078 | 10.40 |
| 2026-08-09 00:00 | 07:25:53.54 | +14:16:12.7 | HIP 36078 | 10.26 |
| 2026-08-09 12:00 | 07:25:54.89 | +14:16:08.5 | HIP 36078 | 10.13 |
| 2026-08-10 00:00 | 07:25:56.23 | +14:16:04.3 | HIP 36078 | 10.01 |
| 2026-08-10 12:00 | 07:25:57.56 | +14:16:00.0 | HIP 36078 | 9.89 |
| 2026-08-11 00:00 | 07:25:58.89 | +14:15:55.7 | HIP 36078 | 9.79 |
| 2026-08-11 12:00 | 07:26:00.21 | +14:15:51.5 | HIP 36078 | 9.69 |
| 2026-08-12 00:00 | 07:26:01.53 | +14:15:47.2 | HIP 36078 | 9.61 |
| 2026-08-12 12:00 | 07:26:02.84 | +14:15:42.9 | HIP 36078 | 9.54 |
| 2026-08-13 00:00 | 07:26:04.14 | +14:15:38.6 | HIP 36078 | 9.47 |
| 2026-08-13 12:00 | 07:26:05.44 | +14:15:34.3 | HIP 36078 | 9.42 |
| 2026-08-14 00:00 | 07:26:06.73 | +14:15:30.0 | HIP 36078 | 9.38 |
| 2026-08-14 12:00 | 07:26:08.02 | +14:15:25.6 | HIP 36078 | 9.35 |
| 2026-08-15 00:00 | 07:26:09.30 | +14:15:21.3 | HIP 36078 | 9.33 |
| 2026-08-15 12:00 | 07:26:10.57 | +14:15:16.9 | HIP 36078 | 9.32 |
| 2026-08-16 00:00 | 07:26:11.83 | +14:15:12.6 | HIP 36078 | 9.32 |
| 2026-08-16 12:00 | 07:26:13.09 | +14:15:08.2 | HIP 36078 | 9.32 |
| 2026-08-17 00:00 | 07:26:14.34 | +14:15:03.9 | HIP 36078 | 9.34 |
| 2026-08-17 12:00 | 07:26:15.59 | +14:14:59.5 | HIP 36078 | 9.37 |
| 2026-08-18 00:00 | 07:26:16.82 | +14:14:55.1 | HIP 36078 | 9.41 |
| 2026-08-18 12:00 | 07:26:18.05 | +14:14:50.7 | HIP 36078 | 9.46 |
| 2026-08-19 00:00 | 07:26:19.28 | +14:14:46.3 | HIP 36078 | 9.52 |