C/1985 K1 (Machholz)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1985 K1 (Machholz) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1985-06-28T17:43:33.605760Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:31Z |
| Obs used | 30 |
| NEO | - |
| M1 | - |
| K1 | - |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1985-06-19.0000000 |
| e | 1.00000000 |
| q (au) | 0.106250 |
| a (au) | - |
| i (deg) | 16.276479 |
| Ω (om, deg) | 195.434274 |
| ω (w, deg) | 274.501133 |
| M (ma, deg) | - |
等級
散乱 + 全体線形
$$ M_a = (9.218 + 3.310\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.218 |
| n | 3.310 |
| gf | 0.800 |
| gb | -1.000 |
| 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 |
|---|---|---|---|
| 1985-05-27 | 1985-06-18 | -1.5006 | -0.214 |
| 1985-06-18 | 1985-06-23 | +1.5912 | +1.580 |
| 1985-06-29 | 1985-09-07 | +6.5165 | +4.535 |
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 | 19:00:48.98 | -06:36:13.3 | HIP 93441 | 20.15 |
| 2026-02-03 12:00 | 19:00:50.55 | -06:36:07.3 | HIP 93441 | 19.79 |
| 2026-02-04 00:00 | 19:00:52.11 | -06:36:01.2 | HIP 93441 | 19.44 |
| 2026-02-04 12:00 | 19:00:53.66 | -06:35:55.1 | HIP 93441 | 19.09 |
| 2026-02-05 00:00 | 19:00:55.20 | -06:35:48.9 | HIP 93441 | 18.74 |
| 2026-02-05 12:00 | 19:00:56.74 | -06:35:42.7 | HIP 93441 | 18.39 |
| 2026-02-06 00:00 | 19:00:58.27 | -06:35:36.4 | HIP 93441 | 18.05 |
| 2026-02-06 12:00 | 19:00:59.79 | -06:35:30.1 | HIP 93441 | 17.71 |
| 2026-02-07 00:00 | 19:01:01.30 | -06:35:23.8 | HIP 93441 | 17.38 |
| 2026-02-07 12:00 | 19:01:02.81 | -06:35:17.4 | HIP 93441 | 17.04 |
| 2026-02-08 00:00 | 19:01:04.30 | -06:35:11.0 | HIP 93441 | 16.71 |
| 2026-02-08 12:00 | 19:01:05.79 | -06:35:04.5 | HIP 93441 | 16.39 |
| 2026-02-09 00:00 | 19:01:07.26 | -06:34:58.0 | HIP 93441 | 16.06 |
| 2026-02-09 12:00 | 19:01:08.73 | -06:34:51.4 | HIP 93441 | 15.75 |
| 2026-02-10 00:00 | 19:01:10.19 | -06:34:44.8 | HIP 93441 | 15.43 |
| 2026-02-10 12:00 | 19:01:11.64 | -06:34:38.2 | HIP 93441 | 15.12 |
| 2026-02-11 00:00 | 19:01:13.08 | -06:34:31.5 | HIP 93441 | 14.81 |
| 2026-02-11 12:00 | 19:01:14.51 | -06:34:24.8 | HIP 93441 | 14.51 |
| 2026-02-12 00:00 | 19:01:15.94 | -06:34:18.1 | HIP 93441 | 14.21 |
| 2026-02-12 12:00 | 19:01:17.35 | -06:34:11.3 | HIP 93441 | 13.91 |
| 2026-02-13 00:00 | 19:01:18.75 | -06:34:04.5 | HIP 93441 | 13.62 |
| 2026-02-13 12:00 | 19:01:20.14 | -06:33:57.6 | HIP 93441 | 13.34 |
| 2026-02-14 00:00 | 19:01:21.53 | -06:33:50.7 | HIP 93441 | 13.06 |
| 2026-02-14 12:00 | 19:01:22.90 | -06:33:43.8 | HIP 93441 | 12.78 |
| 2026-02-15 00:00 | 19:01:24.26 | -06:33:36.8 | HIP 93441 | 12.51 |
| 2026-02-15 12:00 | 19:01:25.61 | -06:33:29.8 | HIP 93441 | 12.24 |
| 2026-02-16 00:00 | 19:01:26.96 | -06:33:22.8 | HIP 93441 | 11.98 |
| 2026-02-16 12:00 | 19:01:28.29 | -06:33:15.7 | HIP 93441 | 11.73 |
| 2026-02-17 00:00 | 19:01:29.61 | -06:33:08.7 | HIP 93441 | 11.48 |
| 2026-02-17 12:00 | 19:01:30.92 | -06:33:01.5 | HIP 93441 | 11.23 |
| 2026-02-18 00:00 | 19:01:32.22 | -06:32:54.4 | HIP 93441 | 11.00 |
| 2026-02-18 12:00 | 19:01:33.51 | -06:32:47.2 | HIP 93441 | 10.76 |
| 2026-02-19 00:00 | 19:01:34.78 | -06:32:40.0 | HIP 93441 | 10.54 |
| 2026-02-19 12:00 | 19:01:36.05 | -06:32:32.7 | HIP 93441 | 10.32 |
| 2026-02-20 00:00 | 19:01:37.30 | -06:32:25.4 | HIP 93441 | 10.11 |
| 2026-02-20 12:00 | 19:01:38.55 | -06:32:18.1 | HIP 93441 | 9.91 |
| 2026-02-21 00:00 | 19:01:39.78 | -06:32:10.8 | HIP 93441 | 9.71 |
| 2026-02-21 12:00 | 19:01:41.00 | -06:32:03.4 | HIP 93441 | 9.52 |
| 2026-02-22 00:00 | 19:01:42.21 | -06:31:56.1 | HIP 93441 | 9.34 |
| 2026-02-22 12:00 | 19:01:43.41 | -06:31:48.6 | HIP 93441 | 9.16 |
| 2026-02-23 00:00 | 19:01:44.60 | -06:31:41.2 | HIP 93441 | 9.00 |
| 2026-02-23 12:00 | 19:01:45.77 | -06:31:33.8 | HIP 93441 | 8.84 |
| 2026-02-24 00:00 | 19:01:46.93 | -06:31:26.3 | HIP 93441 | 8.69 |