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) |
| 2026-05-12 00:00 |
11:27:48.84 |
+04:37:54.0 |
HIP 55915 |
39.39 |
| 2026-05-12 12:00 |
11:27:45.89 |
+04:37:44.2 |
HIP 55915 |
39.18 |
| 2026-05-13 00:00 |
11:27:43.14 |
+04:37:33.2 |
HIP 55915 |
38.97 |
| 2026-05-13 12:00 |
11:27:40.58 |
+04:37:21.0 |
HIP 55915 |
38.76 |
| 2026-05-14 00:00 |
11:27:38.23 |
+04:37:07.6 |
HIP 55915 |
38.53 |
| 2026-05-14 12:00 |
11:27:36.07 |
+04:36:53.1 |
HIP 55915 |
38.29 |
| 2026-05-15 00:00 |
11:27:34.10 |
+04:36:37.4 |
HIP 55915 |
38.04 |
| 2026-05-15 12:00 |
11:27:32.34 |
+04:36:20.6 |
HIP 55915 |
37.78 |
| 2026-05-16 00:00 |
11:27:30.76 |
+04:36:02.5 |
HIP 55915 |
37.50 |
| 2026-05-16 12:00 |
11:27:29.39 |
+04:35:43.3 |
HIP 55915 |
37.20 |
| 2026-05-17 00:00 |
11:27:28.21 |
+04:35:23.0 |
HIP 55915 |
36.88 |
| 2026-05-17 12:00 |
11:27:27.22 |
+04:35:01.5 |
HIP 55915 |
36.54 |
| 2026-05-18 00:00 |
11:27:26.42 |
+04:34:38.9 |
HIP 55915 |
36.18 |
| 2026-05-18 12:00 |
11:27:25.82 |
+04:34:15.1 |
HIP 55915 |
35.80 |
| 2026-05-19 00:00 |
11:27:25.42 |
+04:33:50.1 |
HIP 55915 |
35.39 |
| 2026-05-19 12:00 |
11:27:25.20 |
+04:33:24.0 |
HIP 55915 |
34.96 |
| 2026-05-20 00:00 |
11:27:25.18 |
+04:32:56.8 |
HIP 55915 |
34.51 |
| 2026-05-20 12:00 |
11:27:25.35 |
+04:32:28.5 |
HIP 55915 |
34.04 |
| 2026-05-21 00:00 |
11:27:25.71 |
+04:31:59.0 |
HIP 55915 |
33.54 |
| 2026-05-21 12:00 |
11:27:26.25 |
+04:31:28.4 |
HIP 55915 |
33.02 |
| 2026-05-22 00:00 |
11:27:26.99 |
+04:30:56.7 |
HIP 55915 |
32.48 |
| 2026-05-22 12:00 |
11:27:27.92 |
+04:30:23.9 |
HIP 55915 |
31.91 |
| 2026-05-23 00:00 |
11:27:29.03 |
+04:29:50.0 |
HIP 55915 |
31.33 |
| 2026-05-23 12:00 |
11:27:30.33 |
+04:29:14.9 |
HIP 55915 |
30.72 |
| 2026-05-24 00:00 |
11:27:31.81 |
+04:28:38.8 |
HIP 55915 |
30.10 |
| 2026-05-24 12:00 |
11:27:33.48 |
+04:28:01.6 |
HIP 55915 |
29.46 |
| 2026-05-25 00:00 |
11:27:35.33 |
+04:27:23.4 |
HIP 55915 |
28.80 |
| 2026-05-25 12:00 |
11:27:37.37 |
+04:26:44.0 |
HIP 55915 |
28.14 |
| 2026-05-26 00:00 |
11:27:39.59 |
+04:26:03.6 |
HIP 55915 |
27.46 |
| 2026-05-26 12:00 |
11:27:41.99 |
+04:25:22.1 |
HIP 55915 |
26.78 |
| 2026-05-27 00:00 |
11:27:44.57 |
+04:24:39.5 |
HIP 55915 |
26.10 |
| 2026-05-27 12:00 |
11:27:47.33 |
+04:23:55.9 |
HIP 55915 |
25.43 |
| 2026-05-28 00:00 |
11:27:50.27 |
+04:23:11.3 |
HIP 55915 |
24.76 |
| 2026-05-28 12:00 |
11:27:53.38 |
+04:22:25.6 |
HIP 55915 |
24.11 |
| 2026-05-29 00:00 |
11:27:56.68 |
+04:21:38.9 |
HIP 55915 |
23.49 |
| 2026-05-29 12:00 |
11:28:00.15 |
+04:20:51.1 |
HIP 55915 |
22.89 |
| 2026-05-30 00:00 |
11:28:03.79 |
+04:20:02.4 |
HIP 55915 |
22.34 |
| 2026-05-30 12:00 |
11:28:07.61 |
+04:19:12.6 |
HIP 55915 |
21.84 |
| 2026-05-31 00:00 |
11:28:11.60 |
+04:18:21.8 |
HIP 55915 |
21.41 |
| 2026-05-31 12:00 |
11:28:15.77 |
+04:17:29.9 |
HIP 55915 |
21.05 |
| 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 |