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) |
| 2026-05-12 00:00 |
20:40:12.91 |
-17:03:21.9 |
HIP 101879 |
21.62 |
| 2026-05-12 12:00 |
20:40:15.37 |
-17:03:00.7 |
HIP 101879 |
22.22 |
| 2026-05-13 00:00 |
20:40:17.61 |
-17:02:40.3 |
HIP 101879 |
22.77 |
| 2026-05-13 12:00 |
20:40:19.61 |
-17:02:20.7 |
HIP 101879 |
23.27 |
| 2026-05-14 00:00 |
20:40:21.40 |
-17:02:02.0 |
HIP 101879 |
23.72 |
| 2026-05-14 12:00 |
20:40:22.95 |
-17:01:44.1 |
HIP 101879 |
24.11 |
| 2026-05-15 00:00 |
20:40:24.28 |
-17:01:27.1 |
HIP 101879 |
24.46 |
| 2026-05-15 12:00 |
20:40:25.38 |
-17:01:10.9 |
HIP 101879 |
24.75 |
| 2026-05-16 00:00 |
20:40:26.25 |
-17:00:55.6 |
HIP 101879 |
24.98 |
| 2026-05-16 12:00 |
20:40:26.90 |
-17:00:41.1 |
HIP 101879 |
25.17 |
| 2026-05-17 00:00 |
20:40:27.31 |
-17:00:27.5 |
HIP 101879 |
25.29 |
| 2026-05-17 12:00 |
20:40:27.50 |
-17:00:14.8 |
HIP 101879 |
25.37 |
| 2026-05-18 00:00 |
20:40:27.45 |
-17:00:02.9 |
HIP 101879 |
25.39 |
| 2026-05-18 12:00 |
20:40:27.17 |
-16:59:51.9 |
HIP 101879 |
25.35 |
| 2026-05-19 00:00 |
20:40:26.67 |
-16:59:41.8 |
HIP 101879 |
25.26 |
| 2026-05-19 12:00 |
20:40:25.93 |
-16:59:32.5 |
HIP 101879 |
25.11 |
| 2026-05-20 00:00 |
20:40:24.96 |
-16:59:24.1 |
HIP 101879 |
24.91 |
| 2026-05-20 12:00 |
20:40:23.77 |
-16:59:16.6 |
HIP 101879 |
24.65 |
| 2026-05-21 00:00 |
20:40:22.34 |
-16:59:10.0 |
HIP 101879 |
24.34 |
| 2026-05-21 12:00 |
20:40:20.68 |
-16:59:04.2 |
HIP 101879 |
23.97 |
| 2026-05-22 00:00 |
20:40:18.79 |
-16:58:59.3 |
HIP 101879 |
23.54 |
| 2026-05-22 12:00 |
20:40:16.66 |
-16:58:55.3 |
HIP 101879 |
23.06 |
| 2026-05-23 00:00 |
20:40:14.31 |
-16:58:52.1 |
HIP 101879 |
22.52 |
| 2026-05-23 12:00 |
20:40:11.73 |
-16:58:49.8 |
HIP 101879 |
21.93 |
| 2026-05-24 00:00 |
20:40:08.91 |
-16:58:48.4 |
HIP 101879 |
21.28 |
| 2026-05-24 12:00 |
20:40:05.87 |
-16:58:47.9 |
HIP 101879 |
20.58 |
| 2026-05-25 00:00 |
20:40:02.59 |
-16:58:48.2 |
HIP 101879 |
19.82 |
| 2026-05-25 12:00 |
20:39:59.08 |
-16:58:49.5 |
HIP 101879 |
19.01 |
| 2026-05-26 00:00 |
20:39:55.35 |
-16:58:51.6 |
HIP 101879 |
18.14 |
| 2026-05-26 12:00 |
20:39:51.38 |
-16:58:54.5 |
HIP 101879 |
17.21 |
| 2026-05-27 00:00 |
20:39:47.18 |
-16:58:58.4 |
HIP 101879 |
16.24 |
| 2026-05-27 12:00 |
20:39:42.75 |
-16:59:03.1 |
HIP 101879 |
15.20 |
| 2026-05-28 00:00 |
20:39:38.09 |
-16:59:08.7 |
HIP 101879 |
14.12 |
| 2026-05-28 12:00 |
20:39:33.20 |
-16:59:15.1 |
HIP 101879 |
12.99 |
| 2026-05-29 00:00 |
20:39:28.08 |
-16:59:22.5 |
HIP 101879 |
11.81 |
| 2026-05-29 12:00 |
20:39:22.73 |
-16:59:30.6 |
HIP 101879 |
10.58 |
| 2026-05-30 00:00 |
20:39:17.15 |
-16:59:39.7 |
HIP 101879 |
9.31 |
| 2026-05-30 12:00 |
20:39:11.34 |
-16:59:49.6 |
HIP 101879 |
8.02 |
| 2026-05-31 00:00 |
20:39:05.30 |
-17:00:00.4 |
HIP 101879 |
6.71 |
| 2026-05-31 12:00 |
20:38:59.03 |
-17:00:12.1 |
HIP 101879 |
5.42 |
| 2026-06-01 00:00 |
20:38:52.53 |
-17:00:24.6 |
HIP 101879 |
4.25 |
| 2026-06-01 12:00 |
20:38:45.80 |
-17:00:38.0 |
HIP 101879 |
3.38 |
| 2026-06-02 00:00 |
20:38:38.85 |
-17:00:52.3 |
HIP 101879 |
3.17 |