メタデータ
| 項目 |
値 |
| Designation |
C/2020 B3 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-10-19T21:22:57Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:24Z |
| Obs used |
185 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-03-13.0000000 |
| e |
0.99826805 |
| q (au) |
3.344460 |
| a (au) |
1931.033136 |
| i (deg) |
20.701635 |
| Ω (om, deg) |
185.824602 |
| ω (w, deg) |
325.092308 |
| M (ma, deg) |
0.001685 |
等級
散乱 + 全体線形
$$
M_a = (16.046 + 2.957\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.046 |
| n |
2.957 |
| gf |
1.000 |
| gb |
-0.768 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
18:23:07.41 |
-02:25:36.4 |
HIP 89948 |
29.68 |
| 2026-09-20 12:00 |
18:23:07.64 |
-02:26:12.1 |
HIP 89948 |
29.82 |
| 2026-09-21 00:00 |
18:23:07.93 |
-02:26:47.8 |
HIP 89948 |
29.98 |
| 2026-09-21 12:00 |
18:23:08.27 |
-02:27:23.4 |
HIP 89948 |
30.17 |
| 2026-09-22 00:00 |
18:23:08.67 |
-02:27:59.0 |
HIP 89948 |
30.38 |
| 2026-09-22 12:00 |
18:23:09.13 |
-02:28:34.6 |
HIP 89948 |
30.62 |
| 2026-09-23 00:00 |
18:23:09.65 |
-02:29:10.1 |
HIP 89948 |
30.88 |
| 2026-09-23 12:00 |
18:23:10.22 |
-02:29:45.5 |
HIP 89948 |
31.16 |
| 2026-09-24 00:00 |
18:23:10.85 |
-02:30:21.0 |
HIP 89948 |
31.47 |
| 2026-09-24 12:00 |
18:23:11.53 |
-02:30:56.3 |
HIP 89948 |
31.79 |
| 2026-09-25 00:00 |
18:23:12.28 |
-02:31:31.6 |
HIP 89948 |
32.14 |
| 2026-09-25 12:00 |
18:23:13.07 |
-02:32:06.9 |
HIP 89948 |
32.51 |
| 2026-09-26 00:00 |
18:23:13.93 |
-02:32:42.1 |
HIP 89948 |
32.90 |
| 2026-09-26 12:00 |
18:23:14.84 |
-02:33:17.3 |
HIP 89948 |
33.31 |
| 2026-09-27 00:00 |
18:23:15.80 |
-02:33:52.3 |
HIP 89948 |
33.74 |
| 2026-09-27 12:00 |
18:23:16.82 |
-02:34:27.4 |
HIP 89948 |
34.19 |
| 2026-09-28 00:00 |
18:23:17.90 |
-02:35:02.3 |
HIP 90228 |
34.29 |
| 2026-09-28 12:00 |
18:23:19.04 |
-02:35:37.2 |
HIP 90228 |
33.65 |
| 2026-09-29 00:00 |
18:23:20.23 |
-02:36:12.0 |
HIP 90228 |
33.00 |
| 2026-09-29 12:00 |
18:23:21.47 |
-02:36:46.8 |
HIP 90228 |
32.35 |
| 2026-09-30 00:00 |
18:23:22.77 |
-02:37:21.4 |
HIP 90228 |
31.69 |
| 2026-09-30 12:00 |
18:23:24.13 |
-02:37:56.0 |
HIP 90228 |
31.02 |
| 2026-10-01 00:00 |
18:23:25.54 |
-02:38:30.5 |
HIP 90228 |
30.35 |
| 2026-10-01 12:00 |
18:23:27.01 |
-02:39:04.9 |
HIP 90228 |
29.67 |
| 2026-10-02 00:00 |
18:23:28.53 |
-02:39:39.3 |
HIP 90228 |
28.98 |
| 2026-10-02 12:00 |
18:23:30.11 |
-02:40:13.5 |
HIP 90228 |
28.29 |
| 2026-10-03 00:00 |
18:23:31.74 |
-02:40:47.7 |
HIP 90228 |
27.59 |
| 2026-10-03 12:00 |
18:23:33.43 |
-02:41:21.7 |
HIP 90228 |
26.88 |
| 2026-10-04 00:00 |
18:23:35.17 |
-02:41:55.7 |
HIP 90228 |
26.17 |
| 2026-10-04 12:00 |
18:23:36.97 |
-02:42:29.6 |
HIP 90228 |
25.45 |
| 2026-10-05 00:00 |
18:23:38.83 |
-02:43:03.3 |
HIP 90228 |
24.72 |
| 2026-10-05 12:00 |
18:23:40.73 |
-02:43:37.0 |
HIP 90228 |
23.99 |
| 2026-10-06 00:00 |
18:23:42.70 |
-02:44:10.6 |
HIP 90228 |
23.25 |
| 2026-10-06 12:00 |
18:23:44.72 |
-02:44:44.0 |
HIP 90228 |
22.50 |
| 2026-10-07 00:00 |
18:23:46.79 |
-02:45:17.4 |
HIP 90228 |
21.75 |
| 2026-10-07 12:00 |
18:23:48.92 |
-02:45:50.6 |
HIP 90228 |
21.00 |
| 2026-10-08 00:00 |
18:23:51.10 |
-02:46:23.7 |
HIP 90228 |
20.24 |
| 2026-10-08 12:00 |
18:23:53.33 |
-02:46:56.7 |
HIP 90228 |
19.47 |
| 2026-10-09 00:00 |
18:23:55.62 |
-02:47:29.6 |
HIP 90228 |
18.70 |
| 2026-10-09 12:00 |
18:23:57.96 |
-02:48:02.4 |
HIP 90228 |
17.93 |
| 2026-10-10 00:00 |
18:24:00.36 |
-02:48:35.0 |
HIP 90228 |
17.15 |
| 2026-10-10 12:00 |
18:24:02.81 |
-02:49:07.5 |
HIP 90228 |
16.38 |
| 2026-10-11 00:00 |
18:24:05.32 |
-02:49:39.9 |
HIP 90228 |
15.60 |