メタデータ
| 項目 |
値 |
| Designation |
17P/Holmes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-26T17:17:14.196480Z |
| Orbit solution date (soln_date, UTC) |
2023-10-10T13:05:23Z |
| Obs used |
2211 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
14.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-10-19.0000000 |
| e |
0.43015482 |
| q (au) |
2.066329 |
| a (au) |
3.626124 |
| i (deg) |
19.070359 |
| Ω (om, deg) |
326.773810 |
| ω (w, deg) |
24.738506 |
| M (ma, deg) |
133.785581 |
等級
散乱 + 全体線形
$$
M_a = (8.460 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.460 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2019-01-17 |
2021-07-29 |
-14.8750 |
+4.940 |
| 2021-07-29 |
2021-10-22 |
+35.1628 |
-14.605 |
| 2021-10-22 |
2022-01-30 |
-23.8751 |
+11.231 |
| 2022-01-30 |
2023-01-22 |
+4.5697 |
-3.280 |
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) |
| 2026-06-01 00:00 |
13:10:26.93 |
-31:50:20.1 |
HIP 64260 |
15.55 |
| 2026-06-01 12:00 |
13:10:15.95 |
-31:47:42.1 |
HIP 64260 |
17.98 |
| 2026-06-02 00:00 |
13:10:05.25 |
-31:45:04.3 |
HIP 64292 |
18.09 |
| 2026-06-02 12:00 |
13:09:54.83 |
-31:42:26.9 |
HIP 64292 |
16.73 |
| 2026-06-03 00:00 |
13:09:44.68 |
-31:39:49.8 |
HIP 64292 |
15.98 |
| 2026-06-03 12:00 |
13:09:34.80 |
-31:37:13.0 |
HIP 64292 |
15.89 |
| 2026-06-04 00:00 |
13:09:25.21 |
-31:34:36.7 |
HIP 64292 |
16.44 |
| 2026-06-04 12:00 |
13:09:15.89 |
-31:32:00.8 |
HIP 64292 |
17.56 |
| 2026-06-05 00:00 |
13:09:06.84 |
-31:29:25.4 |
HIP 64292 |
19.12 |
| 2026-06-05 12:00 |
13:08:58.08 |
-31:26:50.4 |
HIP 64292 |
21.00 |
| 2026-06-06 00:00 |
13:08:49.59 |
-31:24:16.0 |
HIP 64292 |
23.11 |
| 2026-06-06 12:00 |
13:08:41.39 |
-31:21:42.0 |
HIP 64292 |
25.38 |
| 2026-06-07 00:00 |
13:08:33.46 |
-31:19:08.7 |
HIP 64292 |
27.75 |
| 2026-06-07 12:00 |
13:08:25.82 |
-31:16:35.9 |
HIP 64292 |
30.19 |
| 2026-06-08 00:00 |
13:08:18.46 |
-31:14:03.7 |
HIP 63981 |
31.20 |
| 2026-06-08 12:00 |
13:08:11.37 |
-31:11:32.2 |
HIP 63981 |
32.12 |
| 2026-06-09 00:00 |
13:08:04.57 |
-31:09:01.4 |
HIP 63981 |
33.30 |
| 2026-06-09 12:00 |
13:07:58.06 |
-31:06:31.2 |
HIP 63917 |
33.74 |
| 2026-06-10 00:00 |
13:07:51.82 |
-31:04:01.7 |
HIP 63917 |
31.19 |
| 2026-06-10 12:00 |
13:07:45.87 |
-31:01:33.0 |
HIP 63917 |
28.76 |
| 2026-06-11 00:00 |
13:07:40.20 |
-30:59:05.0 |
HIP 63917 |
26.45 |
| 2026-06-11 12:00 |
13:07:34.81 |
-30:56:37.8 |
HIP 63917 |
24.29 |
| 2026-06-12 00:00 |
13:07:29.71 |
-30:54:11.5 |
HIP 63917 |
22.31 |
| 2026-06-12 12:00 |
13:07:24.89 |
-30:51:45.9 |
HIP 63917 |
20.56 |
| 2026-06-13 00:00 |
13:07:20.35 |
-30:49:21.3 |
HIP 63917 |
19.07 |
| 2026-06-13 12:00 |
13:07:16.10 |
-30:46:57.5 |
HIP 63917 |
17.90 |
| 2026-06-14 00:00 |
13:07:12.13 |
-30:44:34.6 |
HIP 63917 |
17.10 |
| 2026-06-14 12:00 |
13:07:08.45 |
-30:42:12.6 |
HIP 63917 |
16.70 |
| 2026-06-15 00:00 |
13:07:05.05 |
-30:39:51.6 |
HIP 64055 |
15.59 |
| 2026-06-15 12:00 |
13:07:01.94 |
-30:37:31.5 |
HIP 64055 |
13.94 |
| 2026-06-16 00:00 |
13:06:59.10 |
-30:35:12.4 |
HIP 64055 |
12.53 |
| 2026-06-16 12:00 |
13:06:56.56 |
-30:32:54.4 |
HIP 64055 |
11.40 |
| 2026-06-17 00:00 |
13:06:54.29 |
-30:30:37.4 |
HIP 64055 |
10.65 |
| 2026-06-17 12:00 |
13:06:52.31 |
-30:28:21.4 |
HIP 64055 |
10.32 |
| 2026-06-18 00:00 |
13:06:50.61 |
-30:26:06.5 |
HIP 64055 |
10.43 |
| 2026-06-18 12:00 |
13:06:49.19 |
-30:23:52.7 |
HIP 64055 |
10.97 |
| 2026-06-19 00:00 |
13:06:48.05 |
-30:21:40.0 |
HIP 64055 |
11.85 |
| 2026-06-19 12:00 |
13:06:47.19 |
-30:19:28.4 |
HIP 64055 |
12.99 |
| 2026-06-20 00:00 |
13:06:46.61 |
-30:17:18.0 |
HIP 64055 |
14.32 |
| 2026-06-20 12:00 |
13:06:46.32 |
-30:15:08.7 |
HIP 64055 |
15.78 |
| 2026-06-21 00:00 |
13:06:46.30 |
-30:13:00.6 |
HIP 64055 |
17.34 |
| 2026-06-21 12:00 |
13:06:46.55 |
-30:10:53.6 |
HIP 64055 |
18.95 |
| 2026-06-22 00:00 |
13:06:47.09 |
-30:08:47.9 |
HIP 64055 |
20.61 |