C/2020 H5 (Robinson)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 H5 (Robinson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-11T22:51:25.208640Z |
| Orbit solution date (soln_date, UTC) |
2025-05-08T09:42:16Z |
| Obs used |
292 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
8.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-04-22T07:56:03.321600Z |
| Discovery magnitude (MPC) |
19.18 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-11-15.0000000 |
| e |
0.99727266 |
| q (au) |
9.345056 |
| a (au) |
3426.435895 |
| i (deg) |
70.232252 |
| Ω (om, deg) |
210.630689 |
| ω (w, deg) |
326.402295 |
| M (ma, deg) |
0.001661 |
等級
散乱 + 全体線形
$$
M_a = (-1.200 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-1.200 |
| n |
6.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-12-14 |
2020-11-22 |
+11.5591 |
-11.528 |
| 2020-12-18 |
2023-05-08 |
+14.7277 |
-14.765 |
| 2023-05-08 |
2025-05-02 |
-3.8779 |
+4.668 |
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) |
| 2026-02-03 00:00 |
15:42:04.43 |
+14:26:25.0 |
HIP 76967 |
14.74 |
| 2026-02-03 12:00 |
15:42:08.30 |
+14:28:00.1 |
HIP 76967 |
13.19 |
| 2026-02-04 00:00 |
15:42:12.09 |
+14:29:35.7 |
HIP 76967 |
11.75 |
| 2026-02-04 12:00 |
15:42:15.82 |
+14:31:11.6 |
HIP 76967 |
10.45 |
| 2026-02-05 00:00 |
15:42:19.48 |
+14:32:48.0 |
HIP 76967 |
9.34 |
| 2026-02-05 12:00 |
15:42:23.06 |
+14:34:24.8 |
HIP 76967 |
8.51 |
| 2026-02-06 00:00 |
15:42:26.58 |
+14:36:02.0 |
HIP 76967 |
8.04 |
| 2026-02-06 12:00 |
15:42:30.03 |
+14:37:39.6 |
HIP 76967 |
7.99 |
| 2026-02-07 00:00 |
15:42:33.40 |
+14:39:17.6 |
HIP 76967 |
8.36 |
| 2026-02-07 12:00 |
15:42:36.70 |
+14:40:56.0 |
HIP 76967 |
9.11 |
| 2026-02-08 00:00 |
15:42:39.93 |
+14:42:34.8 |
HIP 76967 |
10.15 |
| 2026-02-08 12:00 |
15:42:43.09 |
+14:44:14.0 |
HIP 76967 |
11.40 |
| 2026-02-09 00:00 |
15:42:46.18 |
+14:45:53.6 |
HIP 76967 |
12.80 |
| 2026-02-09 12:00 |
15:42:49.19 |
+14:47:33.5 |
HIP 76967 |
14.30 |
| 2026-02-10 00:00 |
15:42:52.13 |
+14:49:13.8 |
HIP 76967 |
15.87 |
| 2026-02-10 12:00 |
15:42:55.00 |
+14:50:54.5 |
HIP 76967 |
17.50 |
| 2026-02-11 00:00 |
15:42:57.79 |
+14:52:35.5 |
HIP 76967 |
19.17 |
| 2026-02-11 12:00 |
15:43:00.52 |
+14:54:16.9 |
HIP 76967 |
20.87 |
| 2026-02-12 00:00 |
15:43:03.16 |
+14:55:58.7 |
HIP 76967 |
22.59 |
| 2026-02-12 12:00 |
15:43:05.74 |
+14:57:40.8 |
HIP 76967 |
24.33 |
| 2026-02-13 00:00 |
15:43:08.24 |
+14:59:23.2 |
HIP 77083 |
25.71 |
| 2026-02-13 12:00 |
15:43:10.67 |
+15:01:06.0 |
HIP 77083 |
24.08 |
| 2026-02-14 00:00 |
15:43:13.02 |
+15:02:49.1 |
HIP 77083 |
22.48 |
| 2026-02-14 12:00 |
15:43:15.30 |
+15:04:32.5 |
HIP 77083 |
20.93 |
| 2026-02-15 00:00 |
15:43:17.50 |
+15:06:16.2 |
HIP 77083 |
19.43 |
| 2026-02-15 12:00 |
15:43:19.63 |
+15:08:00.3 |
HIP 77083 |
18.01 |
| 2026-02-16 00:00 |
15:43:21.68 |
+15:09:44.7 |
HIP 77083 |
16.67 |
| 2026-02-16 12:00 |
15:43:23.66 |
+15:11:29.3 |
HIP 77083 |
15.45 |
| 2026-02-17 00:00 |
15:43:25.56 |
+15:13:14.3 |
HIP 77083 |
14.36 |
| 2026-02-17 12:00 |
15:43:27.39 |
+15:14:59.6 |
HIP 77083 |
13.45 |
| 2026-02-18 00:00 |
15:43:29.14 |
+15:16:45.1 |
HIP 77083 |
12.75 |
| 2026-02-18 12:00 |
15:43:30.82 |
+15:18:30.9 |
HIP 77083 |
12.30 |
| 2026-02-19 00:00 |
15:43:32.42 |
+15:20:17.0 |
HIP 77083 |
12.12 |
| 2026-02-19 12:00 |
15:43:33.95 |
+15:22:03.4 |
HIP 77083 |
12.22 |
| 2026-02-20 00:00 |
15:43:35.40 |
+15:23:50.0 |
HIP 77050 |
11.65 |
| 2026-02-20 12:00 |
15:43:36.77 |
+15:25:36.9 |
HIP 77050 |
9.98 |
| 2026-02-21 00:00 |
15:43:38.07 |
+15:27:24.0 |
HIP 77050 |
8.38 |
| 2026-02-21 12:00 |
15:43:39.29 |
+15:29:11.4 |
HIP 77050 |
6.90 |
| 2026-02-22 00:00 |
15:43:40.44 |
+15:30:59.0 |
HIP 77050 |
5.63 |
| 2026-02-22 12:00 |
15:43:41.51 |
+15:32:46.8 |
HIP 77050 |
4.76 |
| 2026-02-23 00:00 |
15:43:42.50 |
+15:34:34.8 |
HIP 77050 |
4.50 |
| 2026-02-23 12:00 |
15:43:43.42 |
+15:36:23.1 |
HIP 77050 |
4.97 |
| 2026-02-24 00:00 |
15:43:44.26 |
+15:38:11.6 |
HIP 77050 |
5.99 |