88P/Howell
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 88P/Howell |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-09-26T14:54:07.367040Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:19:13Z |
| Obs used | 3352 |
| NEO | - |
| M1 | 11.400 |
| K1 | 10.500 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-01-06.0000000 |
| e | 0.56423966 |
| q (au) | 1.353163 |
| a (au) | 3.105291 |
| i (deg) | 4.383893 |
| Ω (om, deg) | 56.685869 |
| ω (w, deg) | 235.913476 |
| M (ma, deg) | 312.337725 |
等級
散乱 + 全体線形
$$ M_a = (6.962 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.962 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.500 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2023-11-23 | 2026-06-27 | +0.2758 | -0.891 |
| 2026-06-27 | 2025-05-02 | +5.9448 | -1.831 |
| 2025-05-02 | 2026-08-01 | +0.0234 | +0.844 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 02:49:17.67 | +12:48:59.5 | HIP 13201 | 13.01 |
| 2026-07-29 12:00 | 02:49:54.82 | +12:51:53.2 | HIP 13201 | 12.55 |
| 2026-07-30 00:00 | 02:50:31.61 | +12:54:44.8 | HIP 13201 | 18.00 |
| 2026-07-30 12:00 | 02:51:08.06 | +12:57:34.5 | HIP 13201 | 25.75 |
| 2026-07-31 00:00 | 02:51:44.15 | +13:00:22.2 | HIP 13324 | 29.46 |
| 2026-07-31 12:00 | 02:52:19.89 | +13:03:07.9 | HIP 13324 | 29.21 |
| 2026-08-01 00:00 | 02:52:55.28 | +13:05:51.7 | HIP 13530 | 23.98 |
| 2026-08-01 12:00 | 02:53:30.30 | +13:08:33.4 | HIP 13530 | 15.74 |
| 2026-08-02 00:00 | 02:54:04.97 | +13:11:13.2 | HIP 13530 | 9.01 |
| 2026-08-02 12:00 | 02:54:39.27 | +13:13:51.0 | HIP 13530 | 8.40 |
| 2026-08-03 00:00 | 02:55:13.20 | +13:16:26.9 | HIP 13638 | 8.19 |
| 2026-08-03 12:00 | 02:55:46.77 | +13:19:00.7 | HIP 13638 | 8.63 |
| 2026-08-04 00:00 | 02:56:19.97 | +13:21:32.7 | HIP 13638 | 15.03 |
| 2026-08-04 12:00 | 02:56:52.79 | +13:24:02.6 | HIP 13638 | 22.72 |
| 2026-08-05 00:00 | 02:57:25.24 | +13:26:30.6 | HIP 13878 | 21.84 |
| 2026-08-05 12:00 | 02:57:57.31 | +13:28:56.6 | HIP 13878 | 13.84 |
| 2026-08-06 00:00 | 02:58:29.00 | +13:31:20.7 | HIP 13878 | 6.37 |
| 2026-08-06 12:00 | 02:59:00.30 | +13:33:42.8 | HIP 13878 | 4.40 |
| 2026-08-07 00:00 | 02:59:31.22 | +13:36:03.0 | HIP 13878 | 11.09 |
| 2026-08-07 12:00 | 03:00:01.75 | +13:38:21.2 | HIP 13878 | 18.62 |
| 2026-08-08 00:00 | 03:00:31.89 | +13:40:37.5 | HIP 13878 | 26.19 |
| 2026-08-08 12:00 | 03:01:01.64 | +13:42:51.8 | HIP 14111 | 31.44 |
| 2026-08-09 00:00 | 03:01:30.99 | +13:45:04.2 | HIP 14111 | 31.31 |
| 2026-08-09 12:00 | 03:01:59.94 | +13:47:14.6 | HIP 14111 | 32.89 |
| 2026-08-10 00:00 | 03:02:28.49 | +13:49:23.1 | HIP 14329 | 34.30 |
| 2026-08-10 12:00 | 03:02:56.63 | +13:51:29.7 | HIP 14329 | 27.67 |
| 2026-08-11 00:00 | 03:03:24.36 | +13:53:34.3 | HIP 14329 | 21.47 |
| 2026-08-11 12:00 | 03:03:51.69 | +13:55:37.0 | HIP 14329 | 16.06 |
| 2026-08-12 00:00 | 03:04:18.60 | +13:57:37.8 | HIP 14329 | 12.34 |
| 2026-08-12 12:00 | 03:04:45.10 | +13:59:36.7 | HIP 14329 | 11.81 |
| 2026-08-13 00:00 | 03:05:11.18 | +14:01:33.6 | HIP 14329 | 14.67 |
| 2026-08-13 12:00 | 03:05:36.83 | +14:03:28.7 | HIP 14404 | 12.86 |
| 2026-08-14 00:00 | 03:06:02.07 | +14:05:21.8 | HIP 14404 | 11.25 |
| 2026-08-14 12:00 | 03:06:26.88 | +14:07:13.0 | HIP 14404 | 12.97 |
| 2026-08-15 00:00 | 03:06:51.27 | +14:09:02.3 | HIP 14404 | 16.93 |
| 2026-08-15 12:00 | 03:07:15.22 | +14:10:49.8 | HIP 14404 | 21.84 |
| 2026-08-16 00:00 | 03:07:38.75 | +14:12:35.3 | HIP 14404 | 27.13 |
| 2026-08-16 12:00 | 03:08:01.84 | +14:14:19.0 | HIP 14404 | 32.54 |
| 2026-08-17 00:00 | 03:08:24.49 | +14:16:00.7 | HIP 14694 | 36.53 |
| 2026-08-17 12:00 | 03:08:46.71 | +14:17:40.7 | HIP 14694 | 35.22 |
| 2026-08-18 00:00 | 03:09:08.49 | +14:19:18.7 | HIP 14694 | 34.79 |
| 2026-08-18 12:00 | 03:09:29.82 | +14:20:54.9 | HIP 14694 | 35.21 |
| 2026-08-19 00:00 | 03:09:50.72 | +14:22:29.2 | HIP 14694 | 36.42 |