17P/Holmes
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 |
-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 |
| 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) |
| 2026-02-03 00:00 |
14:07:51.13 |
-31:25:38.7 |
HIP 68965 |
9.45 |
| 2026-02-03 12:00 |
14:07:57.93 |
-31:28:39.5 |
HIP 68965 |
11.71 |
| 2026-02-04 00:00 |
14:08:04.50 |
-31:31:39.8 |
HIP 68965 |
14.36 |
| 2026-02-04 12:00 |
14:08:10.84 |
-31:34:39.5 |
HIP 68965 |
17.19 |
| 2026-02-05 00:00 |
14:08:16.96 |
-31:37:38.5 |
HIP 69000 |
17.46 |
| 2026-02-05 12:00 |
14:08:22.85 |
-31:40:36.9 |
HIP 69000 |
15.80 |
| 2026-02-06 00:00 |
14:08:28.51 |
-31:43:34.7 |
HIP 69000 |
14.63 |
| 2026-02-06 12:00 |
14:08:33.94 |
-31:46:31.8 |
HIP 69000 |
14.06 |
| 2026-02-07 00:00 |
14:08:39.14 |
-31:49:28.2 |
HIP 69000 |
14.15 |
| 2026-02-07 12:00 |
14:08:44.10 |
-31:52:23.9 |
HIP 69000 |
14.86 |
| 2026-02-08 00:00 |
14:08:48.82 |
-31:55:19.0 |
HIP 69000 |
16.10 |
| 2026-02-08 12:00 |
14:08:53.31 |
-31:58:13.4 |
HIP 69003 |
17.55 |
| 2026-02-09 00:00 |
14:08:57.56 |
-32:01:07.0 |
HIP 69003 |
17.58 |
| 2026-02-09 12:00 |
14:09:01.57 |
-32:04:00.0 |
HIP 69003 |
18.07 |
| 2026-02-10 00:00 |
14:09:05.33 |
-32:06:52.1 |
HIP 69003 |
18.97 |
| 2026-02-10 12:00 |
14:09:08.86 |
-32:09:43.5 |
HIP 69003 |
20.22 |
| 2026-02-11 00:00 |
14:09:12.13 |
-32:12:34.2 |
HIP 69003 |
21.75 |
| 2026-02-11 12:00 |
14:09:15.17 |
-32:15:24.1 |
HIP 69271 |
23.17 |
| 2026-02-12 00:00 |
14:09:17.95 |
-32:18:13.2 |
HIP 69271 |
24.12 |
| 2026-02-12 12:00 |
14:09:20.49 |
-32:21:01.5 |
HIP 69271 |
25.40 |
| 2026-02-13 00:00 |
14:09:22.78 |
-32:23:48.9 |
HIP 69271 |
26.95 |
| 2026-02-13 12:00 |
14:09:24.82 |
-32:26:35.6 |
HIP 69271 |
28.72 |
| 2026-02-14 00:00 |
14:09:26.60 |
-32:29:21.4 |
HIP 69271 |
30.67 |
| 2026-02-14 12:00 |
14:09:28.13 |
-32:32:06.3 |
HIP 69271 |
32.75 |
| 2026-02-15 00:00 |
14:09:29.41 |
-32:34:50.4 |
HIP 69078 |
31.70 |
| 2026-02-15 12:00 |
14:09:30.43 |
-32:37:33.6 |
HIP 69078 |
29.40 |
| 2026-02-16 00:00 |
14:09:31.20 |
-32:40:15.9 |
HIP 69078 |
27.16 |
| 2026-02-16 12:00 |
14:09:31.71 |
-32:42:57.3 |
HIP 69078 |
24.99 |
| 2026-02-17 00:00 |
14:09:31.96 |
-32:45:37.7 |
HIP 69078 |
22.92 |
| 2026-02-17 12:00 |
14:09:31.94 |
-32:48:17.3 |
HIP 69078 |
20.95 |
| 2026-02-18 00:00 |
14:09:31.67 |
-32:50:55.8 |
HIP 69078 |
19.11 |
| 2026-02-18 12:00 |
14:09:31.14 |
-32:53:33.4 |
HIP 69078 |
17.45 |
| 2026-02-19 00:00 |
14:09:30.34 |
-32:56:10.0 |
HIP 69078 |
16.01 |
| 2026-02-19 12:00 |
14:09:29.29 |
-32:58:45.6 |
HIP 69188 |
14.30 |
| 2026-02-20 00:00 |
14:09:27.96 |
-33:01:20.2 |
HIP 69188 |
11.93 |
| 2026-02-20 12:00 |
14:09:26.38 |
-33:03:53.8 |
HIP 69188 |
9.73 |
| 2026-02-21 00:00 |
14:09:24.52 |
-33:06:26.3 |
HIP 69188 |
7.80 |
| 2026-02-21 12:00 |
14:09:22.41 |
-33:08:57.7 |
HIP 69188 |
6.40 |
| 2026-02-22 00:00 |
14:09:20.02 |
-33:11:28.1 |
HIP 69188 |
5.92 |
| 2026-02-22 12:00 |
14:09:17.37 |
-33:13:57.4 |
HIP 69188 |
6.53 |
| 2026-02-23 00:00 |
14:09:14.45 |
-33:16:25.6 |
HIP 69188 |
8.00 |
| 2026-02-23 12:00 |
14:09:11.27 |
-33:18:52.7 |
HIP 69188 |
9.95 |
| 2026-02-24 00:00 |
14:09:07.81 |
-33:21:18.7 |
HIP 69076 |
9.89 |