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 · 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) |
| 2026-05-12 00:00 |
10:56:10.59 |
+15:00:57.4 |
HIP 53522 |
19.50 |
| 2026-05-12 12:00 |
10:56:09.98 |
+15:00:42.7 |
HIP 53522 |
19.78 |
| 2026-05-13 00:00 |
10:56:09.49 |
+15:00:27.4 |
HIP 53522 |
20.06 |
| 2026-05-13 12:00 |
10:56:09.11 |
+15:00:11.3 |
HIP 53522 |
20.33 |
| 2026-05-14 00:00 |
10:56:08.84 |
+14:59:54.4 |
HIP 53522 |
20.60 |
| 2026-05-14 12:00 |
10:56:08.68 |
+14:59:36.9 |
HIP 53522 |
20.86 |
| 2026-05-15 00:00 |
10:56:08.63 |
+14:59:18.6 |
HIP 53522 |
21.12 |
| 2026-05-15 12:00 |
10:56:08.70 |
+14:58:59.6 |
HIP 53522 |
21.37 |
| 2026-05-16 00:00 |
10:56:08.88 |
+14:58:39.9 |
HIP 53522 |
21.62 |
| 2026-05-16 12:00 |
10:56:09.18 |
+14:58:19.5 |
HIP 53522 |
21.87 |
| 2026-05-17 00:00 |
10:56:09.59 |
+14:57:58.4 |
HIP 53522 |
22.12 |
| 2026-05-17 12:00 |
10:56:10.10 |
+14:57:36.5 |
HIP 53522 |
22.36 |
| 2026-05-18 00:00 |
10:56:10.74 |
+14:57:14.0 |
HIP 53522 |
22.61 |
| 2026-05-18 12:00 |
10:56:11.48 |
+14:56:50.7 |
HIP 53522 |
22.86 |
| 2026-05-19 00:00 |
10:56:12.34 |
+14:56:26.8 |
HIP 53522 |
23.10 |
| 2026-05-19 12:00 |
10:56:13.31 |
+14:56:02.1 |
HIP 53522 |
23.36 |
| 2026-05-20 00:00 |
10:56:14.39 |
+14:55:36.8 |
HIP 53522 |
23.62 |
| 2026-05-20 12:00 |
10:56:15.58 |
+14:55:10.8 |
HIP 53522 |
23.88 |
| 2026-05-21 00:00 |
10:56:16.89 |
+14:54:44.1 |
HIP 53522 |
24.15 |
| 2026-05-21 12:00 |
10:56:18.31 |
+14:54:16.7 |
HIP 53522 |
24.44 |
| 2026-05-22 00:00 |
10:56:19.83 |
+14:53:48.6 |
HIP 53522 |
24.73 |
| 2026-05-22 12:00 |
10:56:21.47 |
+14:53:19.9 |
HIP 53522 |
25.03 |
| 2026-05-23 00:00 |
10:56:23.22 |
+14:52:50.5 |
HIP 53522 |
25.35 |
| 2026-05-23 12:00 |
10:56:25.08 |
+14:52:20.4 |
HIP 53522 |
25.68 |
| 2026-05-24 00:00 |
10:56:27.05 |
+14:51:49.6 |
HIP 53522 |
26.03 |
| 2026-05-24 12:00 |
10:56:29.13 |
+14:51:18.2 |
HIP 53522 |
26.40 |
| 2026-05-25 00:00 |
10:56:31.32 |
+14:50:46.2 |
HIP 53522 |
26.78 |
| 2026-05-25 12:00 |
10:56:33.62 |
+14:50:13.5 |
HIP 53522 |
27.18 |
| 2026-05-26 00:00 |
10:56:36.02 |
+14:49:40.1 |
HIP 53522 |
27.61 |
| 2026-05-26 12:00 |
10:56:38.54 |
+14:49:06.1 |
HIP 53522 |
28.06 |
| 2026-05-27 00:00 |
10:56:41.16 |
+14:48:31.5 |
HIP 53598 |
27.57 |
| 2026-05-27 12:00 |
10:56:43.89 |
+14:47:56.2 |
HIP 53598 |
26.69 |
| 2026-05-28 00:00 |
10:56:46.73 |
+14:47:20.3 |
HIP 53598 |
25.79 |
| 2026-05-28 12:00 |
10:56:49.68 |
+14:46:43.8 |
HIP 53598 |
24.87 |
| 2026-05-29 00:00 |
10:56:52.73 |
+14:46:06.7 |
HIP 53598 |
23.92 |
| 2026-05-29 12:00 |
10:56:55.89 |
+14:45:28.9 |
HIP 53598 |
22.95 |
| 2026-05-30 00:00 |
10:56:59.16 |
+14:44:50.5 |
HIP 53598 |
21.95 |
| 2026-05-30 12:00 |
10:57:02.53 |
+14:44:11.5 |
HIP 53598 |
20.94 |
| 2026-05-31 00:00 |
10:57:06.01 |
+14:43:31.8 |
HIP 53598 |
19.90 |
| 2026-05-31 12:00 |
10:57:09.60 |
+14:42:51.6 |
HIP 53598 |
18.84 |
| 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 |