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) |
| 2026-06-01 00:00 |
11:28:20.10 |
+04:16:37.1 |
HIP 55915 |
20.78 |
| 2026-06-01 12:00 |
11:28:24.61 |
+04:15:43.3 |
HIP 55915 |
20.61 |
| 2026-06-02 00:00 |
11:28:29.29 |
+04:14:48.5 |
HIP 55915 |
20.55 |
| 2026-06-02 12:00 |
11:28:34.13 |
+04:13:52.7 |
HIP 55915 |
20.62 |
| 2026-06-03 00:00 |
11:28:39.15 |
+04:12:55.9 |
HIP 55915 |
20.82 |
| 2026-06-03 12:00 |
11:28:44.33 |
+04:11:58.1 |
HIP 55915 |
21.15 |
| 2026-06-04 00:00 |
11:28:49.68 |
+04:10:59.4 |
HIP 55915 |
21.62 |
| 2026-06-04 12:00 |
11:28:55.19 |
+04:09:59.7 |
HIP 55915 |
22.24 |
| 2026-06-05 00:00 |
11:29:00.87 |
+04:08:59.0 |
HIP 55915 |
22.99 |
| 2026-06-05 12:00 |
11:29:06.72 |
+04:07:57.4 |
HIP 56073 |
22.37 |
| 2026-06-06 00:00 |
11:29:12.72 |
+04:06:54.8 |
HIP 56073 |
20.93 |
| 2026-06-06 12:00 |
11:29:18.89 |
+04:05:51.2 |
HIP 56073 |
19.52 |
| 2026-06-07 00:00 |
11:29:25.22 |
+04:04:46.8 |
HIP 56073 |
18.18 |
| 2026-06-07 12:00 |
11:29:31.71 |
+04:03:41.4 |
HIP 56073 |
16.93 |
| 2026-06-08 00:00 |
11:29:38.36 |
+04:02:35.0 |
HIP 56073 |
15.80 |
| 2026-06-08 12:00 |
11:29:45.17 |
+04:01:27.7 |
HIP 56073 |
14.85 |
| 2026-06-09 00:00 |
11:29:52.14 |
+04:00:19.5 |
HIP 56073 |
14.13 |
| 2026-06-09 12:00 |
11:29:59.27 |
+03:59:10.4 |
HIP 56073 |
13.69 |
| 2026-06-10 00:00 |
11:30:06.55 |
+03:58:00.3 |
HIP 56073 |
13.58 |
| 2026-06-10 12:00 |
11:30:13.99 |
+03:56:49.3 |
HIP 56073 |
13.83 |
| 2026-06-11 00:00 |
11:30:21.58 |
+03:55:37.5 |
HIP 56073 |
14.43 |
| 2026-06-11 12:00 |
11:30:29.33 |
+03:54:24.7 |
HIP 56073 |
15.36 |
| 2026-06-12 00:00 |
11:30:37.23 |
+03:53:11.0 |
HIP 56073 |
16.59 |
| 2026-06-12 12:00 |
11:30:45.28 |
+03:51:56.5 |
HIP 56073 |
18.07 |
| 2026-06-13 00:00 |
11:30:53.49 |
+03:50:41.0 |
HIP 56073 |
19.76 |
| 2026-06-13 12:00 |
11:31:01.84 |
+03:49:24.6 |
HIP 56073 |
21.61 |
| 2026-06-14 00:00 |
11:31:10.35 |
+03:48:07.4 |
HIP 56073 |
23.61 |
| 2026-06-14 12:00 |
11:31:19.00 |
+03:46:49.3 |
HIP 56073 |
25.73 |
| 2026-06-15 00:00 |
11:31:27.80 |
+03:45:30.4 |
HIP 56073 |
27.96 |
| 2026-06-15 12:00 |
11:31:36.75 |
+03:44:10.5 |
HIP 56073 |
30.28 |
| 2026-06-16 00:00 |
11:31:45.85 |
+03:42:49.8 |
HIP 56371 |
31.52 |
| 2026-06-16 12:00 |
11:31:55.09 |
+03:41:28.3 |
HIP 56371 |
28.90 |
| 2026-06-17 00:00 |
11:32:04.47 |
+03:40:05.9 |
HIP 56371 |
26.26 |
| 2026-06-17 12:00 |
11:32:14.00 |
+03:38:42.7 |
HIP 56371 |
23.60 |
| 2026-06-18 00:00 |
11:32:23.67 |
+03:37:18.6 |
HIP 56371 |
20.93 |
| 2026-06-18 12:00 |
11:32:33.48 |
+03:35:53.7 |
HIP 56371 |
18.26 |
| 2026-06-19 00:00 |
11:32:43.43 |
+03:34:28.0 |
HIP 56371 |
15.62 |
| 2026-06-19 12:00 |
11:32:53.52 |
+03:33:01.5 |
HIP 56371 |
13.04 |
| 2026-06-20 00:00 |
11:33:03.75 |
+03:31:34.1 |
HIP 56371 |
10.60 |
| 2026-06-20 12:00 |
11:33:14.11 |
+03:30:06.0 |
HIP 56371 |
8.47 |
| 2026-06-21 00:00 |
11:33:24.61 |
+03:28:37.1 |
HIP 56371 |
6.97 |
| 2026-06-21 12:00 |
11:33:35.25 |
+03:27:07.4 |
HIP 56371 |
6.62 |
| 2026-06-22 00:00 |
11:33:46.02 |
+03:25:36.8 |
HIP 56371 |
7.61 |