P/2020 W1 (Rankin)
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) |
| 2026-02-03 00:00 |
11:21:16.61 |
+12:19:27.8 |
HIP 55428 |
14.32 |
| 2026-02-03 12:00 |
11:21:09.11 |
+12:20:45.1 |
HIP 55428 |
12.77 |
| 2026-02-04 00:00 |
11:21:01.52 |
+12:22:02.7 |
HIP 55428 |
11.43 |
| 2026-02-04 12:00 |
11:20:53.84 |
+12:23:20.6 |
HIP 55428 |
10.43 |
| 2026-02-05 00:00 |
11:20:46.08 |
+12:24:38.7 |
HIP 55428 |
9.86 |
| 2026-02-05 12:00 |
11:20:38.24 |
+12:25:57.1 |
HIP 55428 |
9.82 |
| 2026-02-06 00:00 |
11:20:30.31 |
+12:27:15.8 |
HIP 55428 |
10.33 |
| 2026-02-06 12:00 |
11:20:22.31 |
+12:28:34.7 |
HIP 55428 |
11.32 |
| 2026-02-07 00:00 |
11:20:14.22 |
+12:29:53.9 |
HIP 55428 |
12.69 |
| 2026-02-07 12:00 |
11:20:06.06 |
+12:31:13.3 |
HIP 55428 |
14.35 |
| 2026-02-08 00:00 |
11:19:57.82 |
+12:32:32.9 |
HIP 55428 |
16.21 |
| 2026-02-08 12:00 |
11:19:49.50 |
+12:33:52.7 |
HIP 55428 |
18.22 |
| 2026-02-09 00:00 |
11:19:41.10 |
+12:35:12.7 |
HIP 55428 |
20.34 |
| 2026-02-09 12:00 |
11:19:32.63 |
+12:36:33.0 |
HIP 55428 |
22.54 |
| 2026-02-10 00:00 |
11:19:24.09 |
+12:37:53.4 |
HIP 55428 |
24.81 |
| 2026-02-10 12:00 |
11:19:15.48 |
+12:39:13.9 |
HIP 55428 |
27.13 |
| 2026-02-11 00:00 |
11:19:06.79 |
+12:40:34.7 |
HIP 55167 |
26.37 |
| 2026-02-11 12:00 |
11:18:58.03 |
+12:41:55.5 |
HIP 55167 |
25.67 |
| 2026-02-12 00:00 |
11:18:49.21 |
+12:43:16.6 |
HIP 55167 |
25.20 |
| 2026-02-12 12:00 |
11:18:40.32 |
+12:44:37.7 |
HIP 55167 |
24.96 |
| 2026-02-13 00:00 |
11:18:31.36 |
+12:45:59.0 |
HIP 55167 |
24.99 |
| 2026-02-13 12:00 |
11:18:22.34 |
+12:47:20.4 |
HIP 55167 |
25.27 |
| 2026-02-14 00:00 |
11:18:13.25 |
+12:48:41.9 |
HIP 55167 |
25.81 |
| 2026-02-14 12:00 |
11:18:04.11 |
+12:50:03.4 |
HIP 55167 |
26.58 |
| 2026-02-15 00:00 |
11:17:54.90 |
+12:51:25.1 |
HIP 55167 |
27.59 |
| 2026-02-15 12:00 |
11:17:45.63 |
+12:52:46.8 |
HIP 55033 |
26.36 |
| 2026-02-16 00:00 |
11:17:36.30 |
+12:54:08.5 |
HIP 55033 |
24.25 |
| 2026-02-16 12:00 |
11:17:26.92 |
+12:55:30.3 |
HIP 55033 |
22.24 |
| 2026-02-17 00:00 |
11:17:17.48 |
+12:56:52.1 |
HIP 55033 |
20.37 |
| 2026-02-17 12:00 |
11:17:07.98 |
+12:58:14.0 |
HIP 55033 |
18.68 |
| 2026-02-18 00:00 |
11:16:58.44 |
+12:59:35.8 |
HIP 55033 |
17.25 |
| 2026-02-18 12:00 |
11:16:48.84 |
+13:00:57.7 |
HIP 55033 |
16.12 |
| 2026-02-19 00:00 |
11:16:39.19 |
+13:02:19.5 |
HIP 55033 |
15.39 |
| 2026-02-19 12:00 |
11:16:29.50 |
+13:03:41.4 |
HIP 55033 |
15.11 |
| 2026-02-20 00:00 |
11:16:19.76 |
+13:05:03.1 |
HIP 55016 |
15.02 |
| 2026-02-20 12:00 |
11:16:09.97 |
+13:06:24.9 |
HIP 55016 |
12.82 |
| 2026-02-21 00:00 |
11:16:00.14 |
+13:07:46.5 |
HIP 55016 |
10.87 |
| 2026-02-21 12:00 |
11:15:50.27 |
+13:09:08.1 |
HIP 55016 |
9.33 |
| 2026-02-22 00:00 |
11:15:40.35 |
+13:10:29.6 |
HIP 55016 |
8.44 |
| 2026-02-22 12:00 |
11:15:30.40 |
+13:11:51.1 |
HIP 55016 |
8.43 |
| 2026-02-23 00:00 |
11:15:20.41 |
+13:13:12.4 |
HIP 55016 |
9.29 |
| 2026-02-23 12:00 |
11:15:10.38 |
+13:14:33.6 |
HIP 55016 |
10.83 |
| 2026-02-24 00:00 |
11:15:00.32 |
+13:15:54.7 |
HIP 55016 |
12.80 |