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 | +16.5221 | -8.904 |
| 1973-05-13 | 1973-10-27 | +2.2522 | -0.506 |
| 1973-10-27 | 1973-12-16 | +1.1249 | -0.564 |
| 1973-12-16 | 1973-12-22 | -5.8442 | -2.631 |
| 1974-01-03 | 1974-01-31 | -1.4684 | -0.130 |
| 1974-01-31 | 1974-02-26 | +4.9471 | +0.036 |
| 1974-02-26 | 1974-03-23 | +11.8736 | -1.157 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 07:23:15.63 | +14:11:09.8 | HIP 35772 | 9.61 |
| 2026-02-03 12:00 | 07:23:14.19 | +14:11:14.1 | HIP 35772 | 9.30 |
| 2026-02-04 00:00 | 07:23:12.76 | +14:11:18.3 | HIP 35772 | 8.99 |
| 2026-02-04 12:00 | 07:23:11.34 | +14:11:22.6 | HIP 35772 | 8.69 |
| 2026-02-05 00:00 | 07:23:09.92 | +14:11:26.9 | HIP 35772 | 8.39 |
| 2026-02-05 12:00 | 07:23:08.51 | +14:11:31.1 | HIP 35772 | 8.10 |
| 2026-02-06 00:00 | 07:23:07.11 | +14:11:35.4 | HIP 35772 | 7.81 |
| 2026-02-06 12:00 | 07:23:05.71 | +14:11:39.7 | HIP 35772 | 7.53 |
| 2026-02-07 00:00 | 07:23:04.32 | +14:11:44.1 | HIP 35772 | 7.25 |
| 2026-02-07 12:00 | 07:23:02.93 | +14:11:48.4 | HIP 35772 | 6.98 |
| 2026-02-08 00:00 | 07:23:01.55 | +14:11:52.7 | HIP 35772 | 6.72 |
| 2026-02-08 12:00 | 07:23:00.18 | +14:11:57.1 | HIP 35772 | 6.47 |
| 2026-02-09 00:00 | 07:22:58.82 | +14:12:01.4 | HIP 35772 | 6.22 |
| 2026-02-09 12:00 | 07:22:57.46 | +14:12:05.8 | HIP 35772 | 5.99 |
| 2026-02-10 00:00 | 07:22:56.11 | +14:12:10.2 | HIP 35772 | 5.77 |
| 2026-02-10 12:00 | 07:22:54.77 | +14:12:14.6 | HIP 35772 | 5.56 |
| 2026-02-11 00:00 | 07:22:53.44 | +14:12:18.9 | HIP 35772 | 5.36 |
| 2026-02-11 12:00 | 07:22:52.11 | +14:12:23.3 | HIP 35772 | 5.17 |
| 2026-02-12 00:00 | 07:22:50.79 | +14:12:27.7 | HIP 35772 | 5.00 |
| 2026-02-12 12:00 | 07:22:49.48 | +14:12:32.2 | HIP 35772 | 4.85 |
| 2026-02-13 00:00 | 07:22:48.18 | +14:12:36.6 | HIP 35772 | 4.72 |
| 2026-02-13 12:00 | 07:22:46.88 | +14:12:41.0 | HIP 35772 | 4.60 |
| 2026-02-14 00:00 | 07:22:45.60 | +14:12:45.4 | HIP 35772 | 4.51 |
| 2026-02-14 12:00 | 07:22:44.32 | +14:12:49.8 | HIP 35772 | 4.44 |
| 2026-02-15 00:00 | 07:22:43.05 | +14:12:54.3 | HIP 35772 | 4.38 |
| 2026-02-15 12:00 | 07:22:41.78 | +14:12:58.7 | HIP 35772 | 4.35 |
| 2026-02-16 00:00 | 07:22:40.53 | +14:13:03.2 | HIP 35772 | 4.35 |
| 2026-02-16 12:00 | 07:22:39.29 | +14:13:07.6 | HIP 35772 | 4.36 |
| 2026-02-17 00:00 | 07:22:38.05 | +14:13:12.1 | HIP 35772 | 4.40 |
| 2026-02-17 12:00 | 07:22:36.82 | +14:13:16.5 | HIP 35772 | 4.45 |
| 2026-02-18 00:00 | 07:22:35.61 | +14:13:21.0 | HIP 35772 | 4.52 |
| 2026-02-18 12:00 | 07:22:34.40 | +14:13:25.4 | HIP 35772 | 4.62 |
| 2026-02-19 00:00 | 07:22:33.20 | +14:13:29.9 | HIP 35772 | 4.72 |
| 2026-02-19 12:00 | 07:22:32.01 | +14:13:34.4 | HIP 35772 | 4.85 |
| 2026-02-20 00:00 | 07:22:30.83 | +14:13:38.8 | HIP 35772 | 4.98 |
| 2026-02-20 12:00 | 07:22:29.65 | +14:13:43.3 | HIP 35772 | 5.13 |
| 2026-02-21 00:00 | 07:22:28.49 | +14:13:47.7 | HIP 35772 | 5.29 |
| 2026-02-21 12:00 | 07:22:27.34 | +14:13:52.2 | HIP 35772 | 5.46 |
| 2026-02-22 00:00 | 07:22:26.20 | +14:13:56.7 | HIP 35772 | 5.63 |
| 2026-02-22 12:00 | 07:22:25.06 | +14:14:01.1 | HIP 35772 | 5.81 |
| 2026-02-23 00:00 | 07:22:23.94 | +14:14:05.6 | HIP 35772 | 6.00 |
| 2026-02-23 12:00 | 07:22:22.83 | +14:14:10.1 | HIP 35772 | 6.19 |
| 2026-02-24 00:00 | 07:22:21.73 | +14:14:14.5 | HIP 35772 | 6.39 |