メタデータ
| 項目 |
値 |
| Designation |
P/2020 V4 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-17T22:00:33.958080Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:49Z |
| Obs used |
619 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-15T08:54:34.099200Z |
| Discovery magnitude (MPC) |
19.23 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) |
2021-07-15.0000000 |
| e |
0.44887531 |
| q (au) |
5.148536 |
| a (au) |
9.341871 |
| i (deg) |
14.243119 |
| Ω (om, deg) |
203.507931 |
| ω (w, deg) |
256.995659 |
| M (ma, deg) |
359.899307 |
等級
散乱 + 全体線形
$$
M_a = (3.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.987 |
| n |
6.000 |
| gf |
0.897 |
| gb |
-0.891 |
| k |
1.000 |
| δ90 |
4.953 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-10-10 |
2019-11-02 |
-11.2590 |
+10.593 |
| 2019-11-02 |
2021-04-21 |
+31.2873 |
-22.459 |
| 2021-08-30 |
2023-03-21 |
+28.4984 |
-21.118 |
| 2023-03-21 |
2024-03-17 |
-8.3408 |
+7.841 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
13:56:08.48 |
-08:44:07.3 |
HIP 67967 |
16.62 |
| 2026-06-01 12:00 |
13:56:02.54 |
-08:43:25.5 |
HIP 67967 |
15.00 |
| 2026-06-02 00:00 |
13:55:56.68 |
-08:42:44.2 |
HIP 67967 |
13.39 |
| 2026-06-02 12:00 |
13:55:50.91 |
-08:42:03.5 |
HIP 67967 |
11.82 |
| 2026-06-03 00:00 |
13:55:45.22 |
-08:41:23.2 |
HIP 67967 |
10.26 |
| 2026-06-03 12:00 |
13:55:39.61 |
-08:40:43.5 |
HIP 67967 |
8.72 |
| 2026-06-04 00:00 |
13:55:34.08 |
-08:40:04.4 |
HIP 67967 |
7.21 |
| 2026-06-04 12:00 |
13:55:28.63 |
-08:39:25.8 |
HIP 67967 |
5.72 |
| 2026-06-05 00:00 |
13:55:23.27 |
-08:38:47.7 |
HIP 67967 |
4.26 |
| 2026-06-05 12:00 |
13:55:18.00 |
-08:38:10.1 |
HIP 67967 |
2.83 |
| 2026-06-06 00:00 |
13:55:12.81 |
-08:37:33.2 |
HIP 67967 |
1.44 |
| 2026-06-06 12:00 |
13:55:07.70 |
-08:36:56.7 |
HIP 67967 |
0.45 |
| 2026-06-07 00:00 |
13:55:02.68 |
-08:36:20.8 |
HIP 67967 |
1.48 |
| 2026-06-07 12:00 |
13:54:57.75 |
-08:35:45.5 |
HIP 67967 |
2.80 |
| 2026-06-08 00:00 |
13:54:52.90 |
-08:35:10.7 |
HIP 67967 |
4.12 |
| 2026-06-08 12:00 |
13:54:48.14 |
-08:34:36.5 |
HIP 67967 |
5.42 |
| 2026-06-09 00:00 |
13:54:43.47 |
-08:34:02.9 |
HIP 67967 |
6.70 |
| 2026-06-09 12:00 |
13:54:38.89 |
-08:33:29.8 |
HIP 67967 |
7.96 |
| 2026-06-10 00:00 |
13:54:34.40 |
-08:32:57.3 |
HIP 67967 |
9.19 |
| 2026-06-10 12:00 |
13:54:30.00 |
-08:32:25.3 |
HIP 67855 |
9.25 |
| 2026-06-11 00:00 |
13:54:25.69 |
-08:31:53.9 |
HIP 67855 |
8.07 |
| 2026-06-11 12:00 |
13:54:21.47 |
-08:31:23.1 |
HIP 67855 |
6.91 |
| 2026-06-12 00:00 |
13:54:17.34 |
-08:30:52.9 |
HIP 67855 |
5.78 |
| 2026-06-12 12:00 |
13:54:13.30 |
-08:30:23.3 |
HIP 67855 |
4.68 |
| 2026-06-13 00:00 |
13:54:09.35 |
-08:29:54.2 |
HIP 67855 |
3.61 |
| 2026-06-13 12:00 |
13:54:05.50 |
-08:29:25.7 |
HIP 67855 |
2.58 |
| 2026-06-14 00:00 |
13:54:01.74 |
-08:28:57.8 |
HIP 67855 |
1.63 |
| 2026-06-14 12:00 |
13:53:58.07 |
-08:28:30.5 |
HIP 67855 |
0.90 |
| 2026-06-15 00:00 |
13:53:54.50 |
-08:28:03.8 |
HIP 67855 |
1.00 |
| 2026-06-15 12:00 |
13:53:51.02 |
-08:27:37.7 |
HIP 67855 |
1.75 |
| 2026-06-16 00:00 |
13:53:47.64 |
-08:27:12.1 |
HIP 67855 |
2.62 |
| 2026-06-16 12:00 |
13:53:44.35 |
-08:26:47.2 |
HIP 67855 |
3.51 |
| 2026-06-17 00:00 |
13:53:41.15 |
-08:26:22.9 |
HIP 67855 |
4.37 |
| 2026-06-17 12:00 |
13:53:38.05 |
-08:25:59.1 |
HIP 67855 |
5.23 |
| 2026-06-18 00:00 |
13:53:35.05 |
-08:25:35.9 |
HIP 67855 |
6.05 |
| 2026-06-18 12:00 |
13:53:32.15 |
-08:25:13.4 |
HIP 67855 |
6.86 |
| 2026-06-19 00:00 |
13:53:29.34 |
-08:24:51.4 |
HIP 67855 |
7.64 |
| 2026-06-19 12:00 |
13:53:26.62 |
-08:24:30.1 |
HIP 67855 |
8.40 |
| 2026-06-20 00:00 |
13:53:24.01 |
-08:24:09.3 |
HIP 67855 |
9.13 |
| 2026-06-20 12:00 |
13:53:21.49 |
-08:23:49.1 |
HIP 67855 |
9.84 |
| 2026-06-21 00:00 |
13:53:19.06 |
-08:23:29.6 |
HIP 67855 |
10.52 |
| 2026-06-21 12:00 |
13:53:16.74 |
-08:23:10.6 |
HIP 67855 |
11.17 |
| 2026-06-22 00:00 |
13:53:14.51 |
-08:22:52.2 |
HIP 67855 |
11.80 |