メタデータ
| 項目 |
値 |
| Designation |
C/2024 PN7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-12-06T10:29:19.893120Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:32Z |
| Obs used |
361 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
10.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-11-21.0000000 |
| e |
0.97739714 |
| q (au) |
1.524538 |
| a (au) |
67.448918 |
| i (deg) |
101.210654 |
| Ω (om, deg) |
358.582175 |
| ω (w, deg) |
74.271986 |
| M (ma, deg) |
359.972533 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-05-12 00:00 |
10:46:54.16 |
-08:46:23.9 |
HIP 52820 |
22.01 |
| 2026-05-12 12:00 |
10:46:45.01 |
-08:45:41.4 |
HIP 52820 |
24.12 |
| 2026-05-13 00:00 |
10:46:36.06 |
-08:44:59.8 |
HIP 52820 |
26.24 |
| 2026-05-13 12:00 |
10:46:27.31 |
-08:44:19.0 |
HIP 52820 |
28.34 |
| 2026-05-14 00:00 |
10:46:18.76 |
-08:43:39.1 |
HIP 52820 |
30.41 |
| 2026-05-14 12:00 |
10:46:10.41 |
-08:43:00.0 |
HIP 52820 |
32.45 |
| 2026-05-15 00:00 |
10:46:02.27 |
-08:42:21.9 |
HIP 52820 |
34.46 |
| 2026-05-15 12:00 |
10:45:54.32 |
-08:41:44.6 |
HIP 52820 |
36.43 |
| 2026-05-16 00:00 |
10:45:46.57 |
-08:41:08.2 |
HIP 52820 |
38.36 |
| 2026-05-16 12:00 |
10:45:39.02 |
-08:40:32.7 |
HIP 52820 |
40.25 |
| 2026-05-17 00:00 |
10:45:31.66 |
-08:39:58.1 |
HIP 52820 |
42.10 |
| 2026-05-17 12:00 |
10:45:24.50 |
-08:39:24.4 |
HIP 52820 |
43.90 |
| 2026-05-18 00:00 |
10:45:17.54 |
-08:38:51.6 |
HIP 52385 |
42.35 |
| 2026-05-18 12:00 |
10:45:10.77 |
-08:38:19.7 |
HIP 52385 |
40.75 |
| 2026-05-19 00:00 |
10:45:04.20 |
-08:37:48.8 |
HIP 52385 |
39.21 |
| 2026-05-19 12:00 |
10:44:57.81 |
-08:37:18.7 |
HIP 52385 |
37.74 |
| 2026-05-20 00:00 |
10:44:51.62 |
-08:36:49.6 |
HIP 52385 |
36.32 |
| 2026-05-20 12:00 |
10:44:45.62 |
-08:36:21.4 |
HIP 52385 |
34.96 |
| 2026-05-21 00:00 |
10:44:39.81 |
-08:35:54.1 |
HIP 52385 |
33.65 |
| 2026-05-21 12:00 |
10:44:34.18 |
-08:35:27.8 |
HIP 52385 |
32.41 |
| 2026-05-22 00:00 |
10:44:28.74 |
-08:35:02.3 |
HIP 52385 |
31.23 |
| 2026-05-22 12:00 |
10:44:23.49 |
-08:34:37.8 |
HIP 52385 |
30.10 |
| 2026-05-23 00:00 |
10:44:18.43 |
-08:34:14.3 |
HIP 52385 |
29.03 |
| 2026-05-23 12:00 |
10:44:13.54 |
-08:33:51.7 |
HIP 52385 |
28.02 |
| 2026-05-24 00:00 |
10:44:08.84 |
-08:33:30.0 |
HIP 52385 |
27.07 |
| 2026-05-24 12:00 |
10:44:04.33 |
-08:33:09.2 |
HIP 52385 |
26.18 |
| 2026-05-25 00:00 |
10:43:59.99 |
-08:32:49.4 |
HIP 52385 |
25.34 |
| 2026-05-25 12:00 |
10:43:55.83 |
-08:32:30.5 |
HIP 52385 |
24.55 |
| 2026-05-26 00:00 |
10:43:51.85 |
-08:32:12.5 |
HIP 52385 |
23.82 |
| 2026-05-26 12:00 |
10:43:48.05 |
-08:31:55.5 |
HIP 52385 |
23.14 |
| 2026-05-27 00:00 |
10:43:44.42 |
-08:31:39.5 |
HIP 52385 |
22.51 |
| 2026-05-27 12:00 |
10:43:40.97 |
-08:31:24.3 |
HIP 52385 |
21.94 |
| 2026-05-28 00:00 |
10:43:37.69 |
-08:31:10.1 |
HIP 52385 |
21.41 |
| 2026-05-28 12:00 |
10:43:34.58 |
-08:30:56.8 |
HIP 52385 |
20.92 |
| 2026-05-29 00:00 |
10:43:31.65 |
-08:30:44.5 |
HIP 52385 |
20.48 |
| 2026-05-29 12:00 |
10:43:28.89 |
-08:30:33.1 |
HIP 52385 |
20.07 |
| 2026-05-30 00:00 |
10:43:26.29 |
-08:30:22.7 |
HIP 52385 |
19.71 |
| 2026-05-30 12:00 |
10:43:23.87 |
-08:30:13.2 |
HIP 52385 |
19.38 |
| 2026-05-31 00:00 |
10:43:21.61 |
-08:30:04.6 |
HIP 52385 |
19.08 |
| 2026-05-31 12:00 |
10:43:19.51 |
-08:29:56.9 |
HIP 52385 |
18.81 |
| 2026-06-01 00:00 |
10:43:17.59 |
-08:29:50.2 |
HIP 52385 |
18.57 |
| 2026-06-01 12:00 |
10:43:15.82 |
-08:29:44.5 |
HIP 52385 |
18.36 |
| 2026-06-02 00:00 |
10:43:14.22 |
-08:29:39.6 |
HIP 52385 |
18.16 |