メタデータ
| 項目 |
値 |
| Designation |
P/2024 FG9 (Nanshan-Hahn) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-20T07:32:21.894720Z |
| Orbit solution date (soln_date, UTC) |
2024-10-26T00:12:24Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
32.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-01-04.0000000 |
| e |
0.50988575 |
| q (au) |
1.596425 |
| a (au) |
3.257251 |
| i (deg) |
1.731019 |
| Ω (om, deg) |
253.044065 |
| ω (w, deg) |
245.894898 |
| M (ma, deg) |
336.978031 |
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) |
| 2026-09-20 00:00 |
19:41:49.68 |
-19:49:24.9 |
HIP 96873 |
16.46 |
| 2026-09-20 12:00 |
19:41:46.81 |
-19:49:38.8 |
HIP 96873 |
16.05 |
| 2026-09-21 00:00 |
19:41:44.17 |
-19:49:52.3 |
HIP 96873 |
15.67 |
| 2026-09-21 12:00 |
19:41:41.75 |
-19:50:05.1 |
HIP 96873 |
15.34 |
| 2026-09-22 00:00 |
19:41:39.57 |
-19:50:17.5 |
HIP 96873 |
15.04 |
| 2026-09-22 12:00 |
19:41:37.62 |
-19:50:29.2 |
HIP 96873 |
14.77 |
| 2026-09-23 00:00 |
19:41:35.90 |
-19:50:40.4 |
HIP 96873 |
14.54 |
| 2026-09-23 12:00 |
19:41:34.41 |
-19:50:51.1 |
HIP 96873 |
14.32 |
| 2026-09-24 00:00 |
19:41:33.15 |
-19:51:01.2 |
HIP 96873 |
14.13 |
| 2026-09-24 12:00 |
19:41:32.12 |
-19:51:10.8 |
HIP 96873 |
13.95 |
| 2026-09-25 00:00 |
19:41:31.32 |
-19:51:19.8 |
HIP 96873 |
13.79 |
| 2026-09-25 12:00 |
19:41:30.74 |
-19:51:28.3 |
HIP 96873 |
13.64 |
| 2026-09-26 00:00 |
19:41:30.39 |
-19:51:36.2 |
HIP 96873 |
13.51 |
| 2026-09-26 12:00 |
19:41:30.27 |
-19:51:43.6 |
HIP 96873 |
13.39 |
| 2026-09-27 00:00 |
19:41:30.38 |
-19:51:50.4 |
HIP 96873 |
13.27 |
| 2026-09-27 12:00 |
19:41:30.71 |
-19:51:56.7 |
HIP 96873 |
13.17 |
| 2026-09-28 00:00 |
19:41:31.26 |
-19:52:02.4 |
HIP 96873 |
13.08 |
| 2026-09-28 12:00 |
19:41:32.04 |
-19:52:07.6 |
HIP 96873 |
13.01 |
| 2026-09-29 00:00 |
19:41:33.05 |
-19:52:12.3 |
HIP 96873 |
12.95 |
| 2026-09-29 12:00 |
19:41:34.27 |
-19:52:16.4 |
HIP 96873 |
12.90 |
| 2026-09-30 00:00 |
19:41:35.72 |
-19:52:19.9 |
HIP 96873 |
12.89 |
| 2026-09-30 12:00 |
19:41:37.39 |
-19:52:23.0 |
HIP 96873 |
12.89 |
| 2026-10-01 00:00 |
19:41:39.29 |
-19:52:25.5 |
HIP 96873 |
12.93 |
| 2026-10-01 12:00 |
19:41:41.40 |
-19:52:27.4 |
HIP 96873 |
13.01 |
| 2026-10-02 00:00 |
19:41:43.74 |
-19:52:28.8 |
HIP 96873 |
13.12 |
| 2026-10-02 12:00 |
19:41:46.30 |
-19:52:29.7 |
HIP 96873 |
13.29 |
| 2026-10-03 00:00 |
19:41:49.07 |
-19:52:30.0 |
HIP 96873 |
13.50 |
| 2026-10-03 12:00 |
19:41:52.07 |
-19:52:29.8 |
HIP 96873 |
13.77 |
| 2026-10-04 00:00 |
19:41:55.28 |
-19:52:29.0 |
HIP 96873 |
14.10 |
| 2026-10-04 12:00 |
19:41:58.71 |
-19:52:27.7 |
HIP 96873 |
14.50 |
| 2026-10-05 00:00 |
19:42:02.36 |
-19:52:25.8 |
HIP 96873 |
14.97 |
| 2026-10-05 12:00 |
19:42:06.22 |
-19:52:23.5 |
HIP 96873 |
15.50 |
| 2026-10-06 00:00 |
19:42:10.31 |
-19:52:20.5 |
HIP 96873 |
16.11 |
| 2026-10-06 12:00 |
19:42:14.60 |
-19:52:17.0 |
HIP 96873 |
16.79 |
| 2026-10-07 00:00 |
19:42:19.11 |
-19:52:13.0 |
HIP 96873 |
17.54 |
| 2026-10-07 12:00 |
19:42:23.84 |
-19:52:08.4 |
HIP 96873 |
18.36 |
| 2026-10-08 00:00 |
19:42:28.78 |
-19:52:03.3 |
HIP 96873 |
19.26 |
| 2026-10-08 12:00 |
19:42:33.93 |
-19:51:57.7 |
HIP 96983 |
20.06 |
| 2026-10-09 00:00 |
19:42:39.29 |
-19:51:51.5 |
HIP 96983 |
19.99 |
| 2026-10-09 12:00 |
19:42:44.86 |
-19:51:44.7 |
HIP 96983 |
20.02 |
| 2026-10-10 00:00 |
19:42:50.65 |
-19:51:37.4 |
HIP 96983 |
20.14 |
| 2026-10-10 12:00 |
19:42:56.64 |
-19:51:29.6 |
HIP 96983 |
20.36 |
| 2026-10-11 00:00 |
19:43:02.84 |
-19:51:21.2 |
HIP 96983 |
20.70 |