メタデータ
| 項目 |
値 |
| Designation |
P/2020 W1 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-04T04:06:18.002880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:15Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-16T08:16:49.900800Z |
| Discovery magnitude (MPC) |
20.90 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-11-08.0000000 |
| e |
0.26491783 |
| q (au) |
5.287627 |
| a (au) |
7.193246 |
| i (deg) |
10.792086 |
| Ω (om, deg) |
124.257217 |
| ω (w, deg) |
264.771285 |
| M (ma, deg) |
11.128390 |
等級
散乱 + 全体線形
$$
M_a = (13.338 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.338 |
| n |
2.000 |
| 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) |
| 2026-06-01 00:00 |
10:57:13.29 |
+14:42:10.8 |
HIP 53598 |
17.77 |
| 2026-06-01 12:00 |
10:57:17.08 |
+14:41:29.3 |
HIP 53598 |
16.68 |
| 2026-06-02 00:00 |
10:57:20.98 |
+14:40:47.3 |
HIP 53598 |
15.57 |
| 2026-06-02 12:00 |
10:57:24.98 |
+14:40:04.7 |
HIP 53598 |
14.45 |
| 2026-06-03 00:00 |
10:57:29.09 |
+14:39:21.4 |
HIP 53598 |
13.33 |
| 2026-06-03 12:00 |
10:57:33.30 |
+14:38:37.6 |
HIP 53598 |
12.21 |
| 2026-06-04 00:00 |
10:57:37.61 |
+14:37:53.2 |
HIP 53598 |
11.09 |
| 2026-06-04 12:00 |
10:57:42.03 |
+14:37:08.2 |
HIP 53598 |
10.00 |
| 2026-06-05 00:00 |
10:57:46.54 |
+14:36:22.7 |
HIP 53598 |
8.95 |
| 2026-06-05 12:00 |
10:57:51.16 |
+14:35:36.5 |
HIP 53598 |
7.98 |
| 2026-06-06 00:00 |
10:57:55.89 |
+14:34:49.8 |
HIP 53598 |
7.11 |
| 2026-06-06 12:00 |
10:58:00.71 |
+14:34:02.5 |
HIP 53598 |
6.43 |
| 2026-06-07 00:00 |
10:58:05.64 |
+14:33:14.7 |
HIP 53598 |
6.00 |
| 2026-06-07 12:00 |
10:58:10.66 |
+14:32:26.3 |
HIP 53598 |
5.91 |
| 2026-06-08 00:00 |
10:58:15.79 |
+14:31:37.3 |
HIP 53598 |
6.19 |
| 2026-06-08 12:00 |
10:58:21.01 |
+14:30:47.7 |
HIP 53598 |
6.80 |
| 2026-06-09 00:00 |
10:58:26.34 |
+14:29:57.7 |
HIP 53649 |
6.04 |
| 2026-06-09 12:00 |
10:58:31.77 |
+14:29:07.0 |
HIP 53649 |
4.93 |
| 2026-06-10 00:00 |
10:58:37.29 |
+14:28:15.8 |
HIP 53649 |
4.11 |
| 2026-06-10 12:00 |
10:58:42.92 |
+14:27:24.1 |
HIP 53649 |
3.82 |
| 2026-06-11 00:00 |
10:58:48.64 |
+14:26:31.8 |
HIP 53649 |
4.20 |
| 2026-06-11 12:00 |
10:58:54.46 |
+14:25:39.0 |
HIP 53649 |
5.12 |
| 2026-06-12 00:00 |
10:59:00.38 |
+14:24:45.6 |
HIP 53649 |
6.37 |
| 2026-06-12 12:00 |
10:59:06.40 |
+14:23:51.8 |
HIP 53649 |
7.81 |
| 2026-06-13 00:00 |
10:59:12.51 |
+14:22:57.3 |
HIP 53649 |
9.37 |
| 2026-06-13 12:00 |
10:59:18.72 |
+14:22:02.4 |
HIP 53649 |
11.01 |
| 2026-06-14 00:00 |
10:59:25.03 |
+14:21:06.9 |
HIP 53649 |
12.70 |
| 2026-06-14 12:00 |
10:59:31.43 |
+14:20:11.0 |
HIP 53649 |
14.45 |
| 2026-06-15 00:00 |
10:59:37.93 |
+14:19:14.5 |
HIP 53649 |
16.23 |
| 2026-06-15 12:00 |
10:59:44.52 |
+14:18:17.5 |
HIP 53649 |
18.04 |
| 2026-06-16 00:00 |
10:59:51.21 |
+14:17:20.0 |
HIP 53649 |
19.89 |
| 2026-06-16 12:00 |
10:59:57.99 |
+14:16:21.9 |
HIP 53649 |
21.77 |
| 2026-06-17 00:00 |
11:00:04.86 |
+14:15:23.4 |
HIP 53649 |
23.68 |
| 2026-06-17 12:00 |
11:00:11.83 |
+14:14:24.4 |
HIP 53649 |
25.61 |
| 2026-06-18 00:00 |
11:00:18.89 |
+14:13:24.9 |
HIP 53649 |
27.58 |
| 2026-06-18 12:00 |
11:00:26.04 |
+14:12:25.0 |
HIP 53649 |
29.56 |
| 2026-06-19 00:00 |
11:00:33.29 |
+14:11:24.5 |
HIP 53649 |
31.58 |
| 2026-06-19 12:00 |
11:00:40.62 |
+14:10:23.6 |
HIP 53649 |
33.61 |
| 2026-06-20 00:00 |
11:00:48.05 |
+14:09:22.2 |
HIP 53929 |
33.73 |
| 2026-06-20 12:00 |
11:00:55.56 |
+14:08:20.3 |
HIP 53929 |
31.86 |
| 2026-06-21 00:00 |
11:01:03.17 |
+14:07:17.9 |
HIP 53929 |
30.00 |
| 2026-06-21 12:00 |
11:01:10.86 |
+14:06:15.1 |
HIP 53929 |
28.16 |
| 2026-06-22 00:00 |
11:01:18.64 |
+14:05:11.9 |
HIP 53929 |
26.35 |