メタデータ
| 項目 |
値 |
| Designation |
468P/Siding Spring |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-11-23T01:26:27.240000Z |
| Orbit solution date (soln_date, UTC) |
2024-07-22T18:42:17Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-07-19T08:58:28.416000Z |
| Discovery magnitude (MPC) |
19.60 V |
| Discovery observatory (MPC) |
I47 · Pierre Auger Observatory, Malargüe |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-06-10.0000000 |
| e |
0.44478834 |
| q (au) |
3.967881 |
| a (au) |
7.146610 |
| i (deg) |
50.364692 |
| Ω (om, deg) |
356.098740 |
| ω (w, deg) |
322.249960 |
| M (ma, deg) |
238.402517 |
等級
散乱 + 全体線形
$$
M_a = (6.096 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.096 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:54:20.54 |
+61:17:49.7 |
HIP 13553 |
7.85 |
| 2026-07-29 12:00 |
02:54:36.00 |
+61:22:09.7 |
HIP 13553 |
3.36 |
| 2026-07-30 00:00 |
02:54:51.25 |
+61:26:29.6 |
HIP 13553 |
2.26 |
| 2026-07-30 12:00 |
02:55:06.30 |
+61:30:49.5 |
HIP 13665 |
6.03 |
| 2026-07-31 00:00 |
02:55:21.14 |
+61:35:09.5 |
HIP 13665 |
5.76 |
| 2026-07-31 12:00 |
02:55:35.77 |
+61:39:29.4 |
HIP 13665 |
8.60 |
| 2026-08-01 00:00 |
02:55:50.18 |
+61:43:49.3 |
HIP 13588 |
12.14 |
| 2026-08-01 12:00 |
02:56:04.38 |
+61:48:09.2 |
HIP 13588 |
9.69 |
| 2026-08-02 00:00 |
02:56:18.37 |
+61:52:29.1 |
HIP 13588 |
9.10 |
| 2026-08-02 12:00 |
02:56:32.13 |
+61:56:48.9 |
HIP 13588 |
10.68 |
| 2026-08-03 00:00 |
02:56:45.68 |
+62:01:08.7 |
HIP 13588 |
13.68 |
| 2026-08-03 12:00 |
02:56:58.99 |
+62:05:28.5 |
HIP 13588 |
17.38 |
| 2026-08-04 00:00 |
02:57:12.09 |
+62:09:48.2 |
HIP 13588 |
21.40 |
| 2026-08-04 12:00 |
02:57:24.95 |
+62:14:07.8 |
HIP 14011 |
21.22 |
| 2026-08-05 00:00 |
02:57:37.58 |
+62:18:27.4 |
HIP 13708 |
19.74 |
| 2026-08-05 12:00 |
02:57:49.98 |
+62:22:46.9 |
HIP 13708 |
16.62 |
| 2026-08-06 00:00 |
02:58:02.14 |
+62:27:06.3 |
HIP 13708 |
14.26 |
| 2026-08-06 12:00 |
02:58:14.06 |
+62:31:25.6 |
HIP 13708 |
13.07 |
| 2026-08-07 00:00 |
02:58:25.73 |
+62:35:44.9 |
HIP 13708 |
13.37 |
| 2026-08-07 12:00 |
02:58:37.17 |
+62:40:04.0 |
HIP 14019 |
13.31 |
| 2026-08-08 00:00 |
02:58:48.35 |
+62:44:23.0 |
HIP 14019 |
11.66 |
| 2026-08-08 12:00 |
02:58:59.29 |
+62:48:41.9 |
HIP 14019 |
11.66 |
| 2026-08-09 00:00 |
02:59:09.97 |
+62:53:00.6 |
HIP 14019 |
13.30 |
| 2026-08-09 12:00 |
02:59:20.40 |
+62:57:19.2 |
HIP 14019 |
16.08 |
| 2026-08-10 00:00 |
02:59:30.57 |
+63:01:37.6 |
HIP 14142 |
19.33 |
| 2026-08-10 12:00 |
02:59:40.47 |
+63:05:55.9 |
HIP 14142 |
18.98 |
| 2026-08-11 00:00 |
02:59:50.12 |
+63:10:14.0 |
HIP 14142 |
19.68 |
| 2026-08-11 12:00 |
02:59:59.50 |
+63:14:31.9 |
HIP 14142 |
21.33 |
| 2026-08-12 00:00 |
03:00:08.60 |
+63:18:49.6 |
HIP 13809 |
21.09 |
| 2026-08-12 12:00 |
03:00:17.44 |
+63:23:07.1 |
HIP 13809 |
19.35 |
| 2026-08-13 00:00 |
03:00:26.00 |
+63:27:24.4 |
HIP 13809 |
18.49 |
| 2026-08-13 12:00 |
03:00:34.29 |
+63:31:41.5 |
HIP 13809 |
18.62 |
| 2026-08-14 00:00 |
03:00:42.30 |
+63:35:58.3 |
HIP 13809 |
19.70 |
| 2026-08-14 12:00 |
03:00:50.02 |
+63:40:14.9 |
HIP 14206 |
16.98 |
| 2026-08-15 00:00 |
03:00:57.46 |
+63:44:31.2 |
HIP 14206 |
14.97 |
| 2026-08-15 12:00 |
03:01:04.62 |
+63:48:47.2 |
HIP 14206 |
14.10 |
| 2026-08-16 00:00 |
03:01:11.48 |
+63:53:02.9 |
HIP 14108 |
10.85 |
| 2026-08-16 12:00 |
03:01:18.05 |
+63:57:18.3 |
HIP 14108 |
6.79 |
| 2026-08-17 00:00 |
03:01:24.33 |
+64:01:33.5 |
HIP 14108 |
3.47 |
| 2026-08-17 12:00 |
03:01:30.31 |
+64:05:48.3 |
HIP 14108 |
3.91 |
| 2026-08-18 00:00 |
03:01:36.00 |
+64:10:02.7 |
HIP 14108 |
7.45 |
| 2026-08-18 12:00 |
03:01:41.38 |
+64:14:16.8 |
HIP 14154 |
10.07 |
| 2026-08-19 00:00 |
03:01:46.45 |
+64:18:30.6 |
HIP 14154 |
6.36 |