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 |
-0.501 |
| 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 |
11:46:09.95 |
+03:27:57.3 |
HIP 57467 |
9.18 |
| 2026-03-26 12:00 |
11:45:51.49 |
+03:29:26.9 |
HIP 57467 |
13.81 |
| 2026-03-27 00:00 |
11:45:33.10 |
+03:30:55.8 |
HIP 57467 |
18.52 |
| 2026-03-27 12:00 |
11:45:14.80 |
+03:32:24.1 |
HIP 57467 |
23.26 |
| 2026-03-28 00:00 |
11:44:56.58 |
+03:33:51.7 |
HIP 57467 |
28.00 |
| 2026-03-28 12:00 |
11:44:38.45 |
+03:35:18.7 |
HIP 57302 |
31.46 |
| 2026-03-29 00:00 |
11:44:20.41 |
+03:36:44.9 |
HIP 57302 |
33.88 |
| 2026-03-29 12:00 |
11:44:02.47 |
+03:38:10.5 |
HIP 57302 |
36.73 |
| 2026-03-30 00:00 |
11:43:44.62 |
+03:39:35.4 |
HIP 57028 |
34.66 |
| 2026-03-30 12:00 |
11:43:26.87 |
+03:40:59.5 |
HIP 57028 |
30.02 |
| 2026-03-31 00:00 |
11:43:09.22 |
+03:42:22.8 |
HIP 57028 |
25.41 |
| 2026-03-31 12:00 |
11:42:51.68 |
+03:43:45.5 |
HIP 57028 |
20.83 |
| 2026-04-01 00:00 |
11:42:34.24 |
+03:45:07.3 |
HIP 57028 |
16.27 |
| 2026-04-01 12:00 |
11:42:16.92 |
+03:46:28.3 |
HIP 57028 |
11.76 |
| 2026-04-02 00:00 |
11:41:59.71 |
+03:47:48.6 |
HIP 57028 |
7.30 |
| 2026-04-02 12:00 |
11:41:42.61 |
+03:49:08.0 |
HIP 57028 |
2.97 |
| 2026-04-03 00:00 |
11:41:25.62 |
+03:50:26.6 |
HIP 57028 |
2.04 |
| 2026-04-03 12:00 |
11:41:08.76 |
+03:51:44.4 |
HIP 57028 |
6.20 |
| 2026-04-04 00:00 |
11:40:52.02 |
+03:53:01.3 |
HIP 57028 |
10.52 |
| 2026-04-04 12:00 |
11:40:35.41 |
+03:54:17.4 |
HIP 57028 |
14.84 |
| 2026-04-05 00:00 |
11:40:18.92 |
+03:55:32.5 |
HIP 56955 |
16.55 |
| 2026-04-05 12:00 |
11:40:02.56 |
+03:56:46.8 |
HIP 56955 |
18.88 |
| 2026-04-06 00:00 |
11:39:46.33 |
+03:58:00.2 |
HIP 56955 |
21.78 |
| 2026-04-06 12:00 |
11:39:30.24 |
+03:59:12.6 |
HIP 56955 |
25.02 |
| 2026-04-07 00:00 |
11:39:14.28 |
+04:00:24.2 |
HIP 56808 |
26.25 |
| 2026-04-07 12:00 |
11:38:58.46 |
+04:01:34.8 |
HIP 56808 |
24.26 |
| 2026-04-08 00:00 |
11:38:42.78 |
+04:02:44.4 |
HIP 56724 |
21.53 |
| 2026-04-08 12:00 |
11:38:27.24 |
+04:03:53.1 |
HIP 56724 |
18.33 |
| 2026-04-09 00:00 |
11:38:11.85 |
+04:05:00.8 |
HIP 56724 |
15.56 |
| 2026-04-09 12:00 |
11:37:56.61 |
+04:06:07.5 |
HIP 56724 |
13.44 |
| 2026-04-10 00:00 |
11:37:41.51 |
+04:07:13.3 |
HIP 56724 |
12.29 |
| 2026-04-10 12:00 |
11:37:26.56 |
+04:08:18.0 |
HIP 56724 |
12.32 |
| 2026-04-11 00:00 |
11:37:11.77 |
+04:09:21.7 |
HIP 56724 |
13.51 |
| 2026-04-11 12:00 |
11:36:57.14 |
+04:10:24.4 |
HIP 56724 |
15.56 |
| 2026-04-12 00:00 |
11:36:42.65 |
+04:11:26.1 |
HIP 56724 |
18.14 |
| 2026-04-12 12:00 |
11:36:28.33 |
+04:12:26.7 |
HIP 56569 |
18.59 |
| 2026-04-13 00:00 |
11:36:14.17 |
+04:13:26.2 |
HIP 56569 |
17.94 |
| 2026-04-13 12:00 |
11:36:00.17 |
+04:14:24.7 |
HIP 56569 |
18.02 |
| 2026-04-14 00:00 |
11:35:46.34 |
+04:15:22.2 |
HIP 56569 |
18.79 |
| 2026-04-14 12:00 |
11:35:32.67 |
+04:16:18.5 |
HIP 56569 |
20.15 |
| 2026-04-15 00:00 |
11:35:19.17 |
+04:17:13.8 |
HIP 56569 |
21.96 |
| 2026-04-15 12:00 |
11:35:05.84 |
+04:18:07.9 |
HIP 56569 |
24.11 |
| 2026-04-16 00:00 |
11:34:52.68 |
+04:19:01.0 |
HIP 56378 |
24.50 |