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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 07:27:18.72 | +14:10:08.0 | HIP 36078 | 18.91 |
| 2026-09-20 12:00 | 07:27:19.30 | +14:10:03.9 | HIP 36078 | 19.04 |
| 2026-09-21 00:00 | 07:27:19.88 | +14:09:59.9 | HIP 36078 | 19.16 |
| 2026-09-21 12:00 | 07:27:20.44 | +14:09:55.8 | HIP 36078 | 19.28 |
| 2026-09-22 00:00 | 07:27:20.98 | +14:09:51.8 | HIP 36078 | 19.40 |
| 2026-09-22 12:00 | 07:27:21.52 | +14:09:47.7 | HIP 36078 | 19.51 |
| 2026-09-23 00:00 | 07:27:22.05 | +14:09:43.7 | HIP 36078 | 19.63 |
| 2026-09-23 12:00 | 07:27:22.56 | +14:09:39.8 | HIP 36078 | 19.74 |
| 2026-09-24 00:00 | 07:27:23.06 | +14:09:35.8 | HIP 36078 | 19.85 |
| 2026-09-24 12:00 | 07:27:23.55 | +14:09:31.8 | HIP 36078 | 19.95 |
| 2026-09-25 00:00 | 07:27:24.02 | +14:09:27.9 | HIP 36078 | 20.05 |
| 2026-09-25 12:00 | 07:27:24.49 | +14:09:24.0 | HIP 36078 | 20.15 |
| 2026-09-26 00:00 | 07:27:24.94 | +14:09:20.1 | HIP 36078 | 20.25 |
| 2026-09-26 12:00 | 07:27:25.38 | +14:09:16.2 | HIP 36078 | 20.35 |
| 2026-09-27 00:00 | 07:27:25.80 | +14:09:12.3 | HIP 36078 | 20.44 |
| 2026-09-27 12:00 | 07:27:26.22 | +14:09:08.5 | HIP 36078 | 20.53 |
| 2026-09-28 00:00 | 07:27:26.62 | +14:09:04.7 | HIP 36078 | 20.62 |
| 2026-09-28 12:00 | 07:27:27.01 | +14:09:00.8 | HIP 36078 | 20.70 |
| 2026-09-29 00:00 | 07:27:27.39 | +14:08:57.1 | HIP 36078 | 20.78 |
| 2026-09-29 12:00 | 07:27:27.75 | +14:08:53.3 | HIP 36078 | 20.86 |
| 2026-09-30 00:00 | 07:27:28.10 | +14:08:49.5 | HIP 36078 | 20.94 |
| 2026-09-30 12:00 | 07:27:28.44 | +14:08:45.8 | HIP 36078 | 21.01 |
| 2026-10-01 00:00 | 07:27:28.77 | +14:08:42.1 | HIP 36078 | 21.08 |
| 2026-10-01 12:00 | 07:27:29.08 | +14:08:38.4 | HIP 36078 | 21.15 |
| 2026-10-02 00:00 | 07:27:29.38 | +14:08:34.8 | HIP 36078 | 21.22 |
| 2026-10-02 12:00 | 07:27:29.67 | +14:08:31.1 | HIP 36078 | 21.28 |
| 2026-10-03 00:00 | 07:27:29.95 | +14:08:27.5 | HIP 36078 | 21.34 |
| 2026-10-03 12:00 | 07:27:30.21 | +14:08:23.9 | HIP 36078 | 21.40 |
| 2026-10-04 00:00 | 07:27:30.46 | +14:08:20.3 | HIP 36078 | 21.45 |
| 2026-10-04 12:00 | 07:27:30.70 | +14:08:16.8 | HIP 36078 | 21.50 |
| 2026-10-05 00:00 | 07:27:30.92 | +14:08:13.2 | HIP 36078 | 21.55 |
| 2026-10-05 12:00 | 07:27:31.13 | +14:08:09.7 | HIP 36078 | 21.60 |
| 2026-10-06 00:00 | 07:27:31.33 | +14:08:06.2 | HIP 36078 | 21.64 |
| 2026-10-06 12:00 | 07:27:31.51 | +14:08:02.8 | HIP 36078 | 21.68 |
| 2026-10-07 00:00 | 07:27:31.69 | +14:07:59.3 | HIP 36078 | 21.72 |
| 2026-10-07 12:00 | 07:27:31.84 | +14:07:55.9 | HIP 36078 | 21.75 |
| 2026-10-08 00:00 | 07:27:31.99 | +14:07:52.5 | HIP 36078 | 21.78 |
| 2026-10-08 12:00 | 07:27:32.12 | +14:07:49.2 | HIP 36078 | 21.81 |
| 2026-10-09 00:00 | 07:27:32.24 | +14:07:45.8 | HIP 36078 | 21.83 |
| 2026-10-09 12:00 | 07:27:32.35 | +14:07:42.5 | HIP 36078 | 21.86 |
| 2026-10-10 00:00 | 07:27:32.44 | +14:07:39.2 | HIP 36078 | 21.87 |
| 2026-10-10 12:00 | 07:27:32.52 | +14:07:36.0 | HIP 36078 | 21.89 |
| 2026-10-11 00:00 | 07:27:32.59 | +14:07:32.7 | HIP 36078 | 21.90 |