メタデータ
| 項目 |
値 |
| Designation |
P/2024 S2 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-09-16T12:34:51.294720Z |
| Orbit solution date (soln_date, UTC) |
2025-01-13T08:43:47Z |
| Obs used |
154 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-09-30T10:08:03.696000Z |
| Discovery magnitude (MPC) |
17.60 G |
| Discovery observatory (MPC) |
V11 · Saguaro Observatory, Tucson |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-10-04.0000000 |
| e |
0.59215299 |
| q (au) |
2.047742 |
| a (au) |
5.020858 |
| i (deg) |
7.523796 |
| Ω (om, deg) |
8.352672 |
| ω (w, deg) |
49.240931 |
| M (ma, deg) |
1.530996 |
等級
散乱 + 全体線形
$$
M_a = (12.271 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.271 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
11:52:09.49 |
+01:03:54.3 |
HIP 58002 |
39.78 |
| 2026-07-29 12:00 |
11:52:27.74 |
+01:01:39.6 |
HIP 58002 |
35.22 |
| 2026-07-30 00:00 |
11:52:46.07 |
+00:59:24.6 |
HIP 58002 |
30.80 |
| 2026-07-30 12:00 |
11:53:04.46 |
+00:57:09.2 |
HIP 58002 |
26.62 |
| 2026-07-31 00:00 |
11:53:22.92 |
+00:54:53.4 |
HIP 58002 |
22.81 |
| 2026-07-31 12:00 |
11:53:41.44 |
+00:52:37.2 |
HIP 58002 |
19.62 |
| 2026-08-01 00:00 |
11:54:00.03 |
+00:50:20.6 |
HIP 58002 |
17.39 |
| 2026-08-01 12:00 |
11:54:18.69 |
+00:48:03.6 |
HIP 58114 |
16.03 |
| 2026-08-02 00:00 |
11:54:37.41 |
+00:45:46.2 |
HIP 58114 |
14.74 |
| 2026-08-02 12:00 |
11:54:56.20 |
+00:43:28.5 |
HIP 58114 |
15.22 |
| 2026-08-03 00:00 |
11:55:15.05 |
+00:41:10.4 |
HIP 58114 |
17.35 |
| 2026-08-03 12:00 |
11:55:33.96 |
+00:38:51.9 |
HIP 58114 |
20.63 |
| 2026-08-04 00:00 |
11:55:52.94 |
+00:36:33.0 |
HIP 58114 |
24.63 |
| 2026-08-04 12:00 |
11:56:11.98 |
+00:34:13.8 |
HIP 58114 |
29.05 |
| 2026-08-05 00:00 |
11:56:31.07 |
+00:31:54.2 |
HIP 58375 |
32.54 |
| 2026-08-05 12:00 |
11:56:50.23 |
+00:29:34.3 |
HIP 58375 |
30.63 |
| 2026-08-06 00:00 |
11:57:09.45 |
+00:27:14.0 |
HIP 58445 |
28.85 |
| 2026-08-06 12:00 |
11:57:28.73 |
+00:24:53.4 |
HIP 58445 |
24.66 |
| 2026-08-07 00:00 |
11:57:48.07 |
+00:22:32.4 |
HIP 58445 |
21.00 |
| 2026-08-07 12:00 |
11:58:07.47 |
+00:20:11.1 |
HIP 58445 |
18.20 |
| 2026-08-08 00:00 |
11:58:26.92 |
+00:17:49.4 |
HIP 58445 |
16.72 |
| 2026-08-08 12:00 |
11:58:46.43 |
+00:15:27.5 |
HIP 58461 |
16.42 |
| 2026-08-09 00:00 |
11:59:06.00 |
+00:13:05.1 |
HIP 58461 |
12.33 |
| 2026-08-09 12:00 |
11:59:25.63 |
+00:10:42.5 |
HIP 58461 |
9.66 |
| 2026-08-10 00:00 |
11:59:45.31 |
+00:08:19.5 |
HIP 58461 |
9.71 |
| 2026-08-10 12:00 |
12:00:05.04 |
+00:05:56.3 |
HIP 58461 |
12.46 |
| 2026-08-11 00:00 |
12:00:24.83 |
+00:03:32.7 |
HIP 58461 |
16.64 |
| 2026-08-11 12:00 |
12:00:44.67 |
+00:01:08.8 |
HIP 58678 |
18.75 |
| 2026-08-12 00:00 |
12:01:04.56 |
-00:01:15.4 |
HIP 58678 |
15.04 |
| 2026-08-12 12:00 |
12:01:24.51 |
-00:03:39.9 |
HIP 58678 |
12.72 |
| 2026-08-13 00:00 |
12:01:44.50 |
-00:06:04.7 |
HIP 58678 |
12.60 |
| 2026-08-13 12:00 |
12:02:04.55 |
-00:08:29.8 |
HIP 58678 |
14.75 |
| 2026-08-14 00:00 |
12:02:24.64 |
-00:10:55.1 |
HIP 58637 |
18.02 |
| 2026-08-14 12:00 |
12:02:44.79 |
-00:13:20.8 |
HIP 58637 |
21.14 |
| 2026-08-15 00:00 |
12:03:04.98 |
-00:15:46.7 |
HIP 58637 |
25.14 |
| 2026-08-15 12:00 |
12:03:25.22 |
-00:18:12.8 |
HIP 58908 |
21.18 |
| 2026-08-16 00:00 |
12:03:45.51 |
-00:20:39.3 |
HIP 58908 |
17.12 |
| 2026-08-16 12:00 |
12:04:05.84 |
-00:23:06.0 |
HIP 58908 |
14.17 |
| 2026-08-17 00:00 |
12:04:26.22 |
-00:25:32.9 |
HIP 58908 |
13.12 |
| 2026-08-17 12:00 |
12:04:46.64 |
-00:28:00.1 |
HIP 58908 |
14.41 |
| 2026-08-18 00:00 |
12:05:07.10 |
-00:30:27.6 |
HIP 58908 |
17.53 |
| 2026-08-18 12:00 |
12:05:27.61 |
-00:32:55.2 |
HIP 58908 |
21.72 |
| 2026-08-19 00:00 |
12:05:48.16 |
-00:35:23.2 |
HIP 59102 |
20.96 |