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 |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
01:04:14.05 |
+46:08:36.4 |
HIP 4734 |
35.68 |
| 2026-03-26 12:00 |
01:04:41.93 |
+46:10:58.2 |
HIP 4734 |
40.47 |
| 2026-03-27 00:00 |
01:05:09.86 |
+46:13:20.9 |
HIP 5388 |
42.82 |
| 2026-03-27 12:00 |
01:05:37.83 |
+46:15:44.7 |
HIP 5388 |
39.50 |
| 2026-03-28 00:00 |
01:06:05.84 |
+46:18:09.3 |
HIP 5388 |
36.69 |
| 2026-03-28 12:00 |
01:06:33.89 |
+46:20:34.9 |
HIP 5303 |
32.65 |
| 2026-03-29 00:00 |
01:07:01.97 |
+46:23:01.3 |
HIP 5303 |
28.69 |
| 2026-03-29 12:00 |
01:07:30.10 |
+46:25:28.7 |
HIP 5303 |
25.27 |
| 2026-03-30 00:00 |
01:07:58.27 |
+46:27:57.0 |
HIP 5303 |
22.63 |
| 2026-03-30 12:00 |
01:08:26.47 |
+46:30:26.3 |
HIP 5303 |
21.06 |
| 2026-03-31 00:00 |
01:08:54.72 |
+46:32:56.4 |
HIP 5303 |
20.84 |
| 2026-03-31 12:00 |
01:09:23.00 |
+46:35:27.4 |
HIP 5554 |
19.36 |
| 2026-04-01 00:00 |
01:09:51.31 |
+46:37:59.3 |
HIP 5554 |
14.35 |
| 2026-04-01 12:00 |
01:10:19.67 |
+46:40:32.0 |
HIP 5554 |
9.87 |
| 2026-04-02 00:00 |
01:10:48.05 |
+46:43:05.7 |
HIP 5554 |
7.03 |
| 2026-04-02 12:00 |
01:11:16.48 |
+46:45:40.2 |
HIP 5554 |
7.88 |
| 2026-04-03 00:00 |
01:11:44.93 |
+46:48:15.7 |
HIP 5554 |
11.67 |
| 2026-04-03 12:00 |
01:12:13.43 |
+46:50:51.9 |
HIP 5554 |
16.48 |
| 2026-04-04 00:00 |
01:12:41.95 |
+46:53:29.1 |
HIP 5728 |
17.17 |
| 2026-04-04 12:00 |
01:13:10.51 |
+46:56:07.1 |
HIP 5677 |
15.75 |
| 2026-04-05 00:00 |
01:13:39.10 |
+46:58:45.9 |
HIP 5677 |
14.75 |
| 2026-04-05 12:00 |
01:14:07.72 |
+47:01:25.6 |
HIP 5677 |
15.75 |
| 2026-04-06 00:00 |
01:14:36.38 |
+47:04:06.2 |
HIP 5677 |
18.44 |
| 2026-04-06 12:00 |
01:15:05.06 |
+47:06:47.6 |
HIP 5677 |
22.22 |
| 2026-04-07 00:00 |
01:15:33.78 |
+47:09:29.8 |
HIP 5820 |
25.13 |
| 2026-04-07 12:00 |
01:16:02.53 |
+47:12:12.9 |
HIP 5820 |
24.93 |
| 2026-04-08 00:00 |
01:16:31.30 |
+47:14:56.8 |
HIP 6087 |
19.63 |
| 2026-04-08 12:00 |
01:17:00.11 |
+47:17:41.5 |
HIP 6087 |
14.03 |
| 2026-04-09 00:00 |
01:17:28.94 |
+47:20:27.0 |
HIP 6087 |
8.43 |
| 2026-04-09 12:00 |
01:17:57.80 |
+47:23:13.4 |
HIP 6087 |
2.86 |
| 2026-04-10 00:00 |
01:18:26.69 |
+47:26:00.6 |
HIP 6087 |
2.92 |
| 2026-04-10 12:00 |
01:18:55.60 |
+47:28:48.5 |
HIP 6087 |
8.50 |
| 2026-04-11 00:00 |
01:19:24.54 |
+47:31:37.3 |
HIP 6087 |
14.13 |
| 2026-04-11 12:00 |
01:19:53.51 |
+47:34:26.9 |
HIP 6087 |
19.77 |
| 2026-04-12 00:00 |
01:20:22.50 |
+47:37:17.3 |
HIP 6073 |
24.64 |
| 2026-04-12 12:00 |
01:20:51.52 |
+47:40:08.5 |
HIP 6349 |
25.61 |
| 2026-04-13 00:00 |
01:21:20.56 |
+47:43:00.5 |
HIP 6349 |
21.89 |
| 2026-04-13 12:00 |
01:21:49.62 |
+47:45:53.3 |
HIP 6349 |
19.12 |
| 2026-04-14 00:00 |
01:22:18.71 |
+47:48:46.8 |
HIP 6349 |
17.77 |
| 2026-04-14 12:00 |
01:22:47.81 |
+47:51:41.1 |
HIP 6349 |
18.15 |
| 2026-04-15 00:00 |
01:23:16.94 |
+47:54:36.2 |
HIP 6349 |
20.18 |
| 2026-04-15 12:00 |
01:23:46.09 |
+47:57:32.1 |
HIP 6553 |
20.22 |
| 2026-04-16 00:00 |
01:24:15.26 |
+48:00:28.7 |
HIP 6553 |
16.79 |