メタデータ
| 項目 |
値 |
| Designation |
C/2017 P2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-06T13:31:41.891520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
23.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-09-13.0000000 |
| e |
0.99796653 |
| q (au) |
2.461777 |
| a (au) |
1210.625678 |
| i (deg) |
50.084856 |
| Ω (om, deg) |
165.546359 |
| ω (w, deg) |
132.238805 |
| M (ma, deg) |
359.998021 |
等級
散乱 + 全体線形
$$
M_a = (16.551 + 5.128\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.551 |
| n |
5.128 |
| gf |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
05:27:17.43 |
-24:51:09.8 |
HIP 25521 |
29.43 |
| 2026-06-01 12:00 |
05:27:23.81 |
-24:50:53.5 |
HIP 25521 |
29.62 |
| 2026-06-02 00:00 |
05:27:30.19 |
-24:50:37.7 |
HIP 25521 |
29.88 |
| 2026-06-02 12:00 |
05:27:36.59 |
-24:50:22.4 |
HIP 25521 |
30.19 |
| 2026-06-03 00:00 |
05:27:42.99 |
-24:50:07.6 |
HIP 25521 |
30.57 |
| 2026-06-03 12:00 |
05:27:49.40 |
-24:49:53.3 |
HIP 25521 |
31.01 |
| 2026-06-04 00:00 |
05:27:55.81 |
-24:49:39.4 |
HIP 25521 |
31.50 |
| 2026-06-04 12:00 |
05:28:02.23 |
-24:49:26.0 |
HIP 25521 |
32.04 |
| 2026-06-05 00:00 |
05:28:08.66 |
-24:49:13.1 |
HIP 25697 |
32.17 |
| 2026-06-05 12:00 |
05:28:15.09 |
-24:49:00.7 |
HIP 25697 |
31.68 |
| 2026-06-06 00:00 |
05:28:21.53 |
-24:48:48.7 |
HIP 25697 |
31.24 |
| 2026-06-06 12:00 |
05:28:27.97 |
-24:48:37.2 |
HIP 25697 |
30.86 |
| 2026-06-07 00:00 |
05:28:34.42 |
-24:48:26.2 |
HIP 25697 |
30.54 |
| 2026-06-07 12:00 |
05:28:40.87 |
-24:48:15.7 |
HIP 25697 |
30.28 |
| 2026-06-08 00:00 |
05:28:47.33 |
-24:48:05.7 |
HIP 25824 |
29.92 |
| 2026-06-08 12:00 |
05:28:53.78 |
-24:47:56.2 |
HIP 25824 |
28.60 |
| 2026-06-09 00:00 |
05:29:00.25 |
-24:47:47.1 |
HIP 25824 |
27.29 |
| 2026-06-09 12:00 |
05:29:06.71 |
-24:47:38.5 |
HIP 25824 |
26.00 |
| 2026-06-10 00:00 |
05:29:13.18 |
-24:47:30.4 |
HIP 25824 |
24.72 |
| 2026-06-10 12:00 |
05:29:19.65 |
-24:47:22.8 |
HIP 25824 |
23.46 |
| 2026-06-11 00:00 |
05:29:26.12 |
-24:47:15.7 |
HIP 25824 |
22.22 |
| 2026-06-11 12:00 |
05:29:32.59 |
-24:47:09.1 |
HIP 25824 |
21.01 |
| 2026-06-12 00:00 |
05:29:39.06 |
-24:47:03.0 |
HIP 25824 |
19.83 |
| 2026-06-12 12:00 |
05:29:45.54 |
-24:46:57.3 |
HIP 25824 |
18.68 |
| 2026-06-13 00:00 |
05:29:52.01 |
-24:46:52.1 |
HIP 25824 |
17.58 |
| 2026-06-13 12:00 |
05:29:58.49 |
-24:46:47.5 |
HIP 25824 |
16.53 |
| 2026-06-14 00:00 |
05:30:04.96 |
-24:46:43.3 |
HIP 25824 |
15.55 |
| 2026-06-14 12:00 |
05:30:11.43 |
-24:46:39.6 |
HIP 25824 |
14.64 |
| 2026-06-15 00:00 |
05:30:17.91 |
-24:46:36.3 |
HIP 25824 |
13.81 |
| 2026-06-15 12:00 |
05:30:24.38 |
-24:46:33.6 |
HIP 25824 |
13.10 |
| 2026-06-16 00:00 |
05:30:30.84 |
-24:46:31.4 |
HIP 25824 |
12.51 |
| 2026-06-16 12:00 |
05:30:37.31 |
-24:46:29.6 |
HIP 25824 |
12.06 |
| 2026-06-17 00:00 |
05:30:43.77 |
-24:46:28.4 |
HIP 25824 |
11.77 |
| 2026-06-17 12:00 |
05:30:50.23 |
-24:46:27.6 |
HIP 25891 |
10.94 |
| 2026-06-18 00:00 |
05:30:56.69 |
-24:46:27.3 |
HIP 25891 |
9.49 |
| 2026-06-18 12:00 |
05:31:03.14 |
-24:46:27.6 |
HIP 25891 |
8.05 |
| 2026-06-19 00:00 |
05:31:09.59 |
-24:46:28.3 |
HIP 25891 |
6.61 |
| 2026-06-19 12:00 |
05:31:16.03 |
-24:46:29.4 |
HIP 25891 |
5.19 |
| 2026-06-20 00:00 |
05:31:22.47 |
-24:46:31.1 |
HIP 25891 |
3.79 |
| 2026-06-20 12:00 |
05:31:28.90 |
-24:46:33.3 |
HIP 25891 |
2.47 |
| 2026-06-21 00:00 |
05:31:35.32 |
-24:46:35.9 |
HIP 25891 |
1.44 |
| 2026-06-21 12:00 |
05:31:41.74 |
-24:46:39.0 |
HIP 25891 |
1.50 |
| 2026-06-22 00:00 |
05:31:48.16 |
-24:46:42.6 |
HIP 25891 |
2.59 |