メタデータ
| 項目 |
値 |
| Designation |
C/2020 T4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-05T05:56:29.909760Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:53Z |
| Obs used |
171 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-15T14:08:31.113600Z |
| Discovery magnitude (MPC) |
21.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-11-23.0000000 |
| e |
1.00004087 |
| q (au) |
2.191878 |
| a (au) |
-53626.423966 |
| i (deg) |
83.817389 |
| Ω (om, deg) |
50.622331 |
| ω (w, deg) |
79.602529 |
| M (ma, deg) |
-0.000018 |
等級
散乱 + 全体線形
$$
M_a = (14.969 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.969 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.849 |
| k |
0.999 |
| 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) |
| 2026-06-01 00:00 |
14:27:57.70 |
-52:31:57.5 |
HIP 70689 |
4.17 |
| 2026-06-01 12:00 |
14:27:45.75 |
-52:31:06.4 |
HIP 70689 |
2.36 |
| 2026-06-02 00:00 |
14:27:33.87 |
-52:30:14.9 |
HIP 70689 |
1.36 |
| 2026-06-02 12:00 |
14:27:22.07 |
-52:29:22.9 |
HIP 70689 |
2.48 |
| 2026-06-03 00:00 |
14:27:10.35 |
-52:28:30.4 |
HIP 70689 |
4.29 |
| 2026-06-03 12:00 |
14:26:58.70 |
-52:27:37.5 |
HIP 70689 |
6.20 |
| 2026-06-04 00:00 |
14:26:47.13 |
-52:26:44.1 |
HIP 70689 |
8.14 |
| 2026-06-04 12:00 |
14:26:35.64 |
-52:25:50.4 |
HIP 70689 |
10.09 |
| 2026-06-05 00:00 |
14:26:24.23 |
-52:24:56.2 |
HIP 70689 |
12.04 |
| 2026-06-05 12:00 |
14:26:12.91 |
-52:24:01.5 |
HIP 70689 |
13.98 |
| 2026-06-06 00:00 |
14:26:01.66 |
-52:23:06.5 |
HIP 70689 |
15.92 |
| 2026-06-06 12:00 |
14:25:50.50 |
-52:22:11.1 |
HIP 70402 |
15.35 |
| 2026-06-07 00:00 |
14:25:39.42 |
-52:21:15.2 |
HIP 70402 |
13.95 |
| 2026-06-07 12:00 |
14:25:28.42 |
-52:20:19.0 |
HIP 70402 |
12.70 |
| 2026-06-08 00:00 |
14:25:17.51 |
-52:19:22.4 |
HIP 70402 |
11.65 |
| 2026-06-08 12:00 |
14:25:06.69 |
-52:18:25.5 |
HIP 70402 |
10.85 |
| 2026-06-09 00:00 |
14:24:55.95 |
-52:17:28.1 |
HIP 70402 |
10.36 |
| 2026-06-09 12:00 |
14:24:45.30 |
-52:16:30.4 |
HIP 70402 |
10.21 |
| 2026-06-10 00:00 |
14:24:34.74 |
-52:15:32.4 |
HIP 70402 |
10.42 |
| 2026-06-10 12:00 |
14:24:24.26 |
-52:14:34.0 |
HIP 70402 |
10.96 |
| 2026-06-11 00:00 |
14:24:13.88 |
-52:13:35.3 |
HIP 70402 |
11.78 |
| 2026-06-11 12:00 |
14:24:03.58 |
-52:12:36.2 |
HIP 70402 |
12.83 |
| 2026-06-12 00:00 |
14:23:53.38 |
-52:11:36.9 |
HIP 70402 |
14.05 |
| 2026-06-12 12:00 |
14:23:43.27 |
-52:10:37.2 |
HIP 70402 |
15.39 |
| 2026-06-13 00:00 |
14:23:33.25 |
-52:09:37.2 |
HIP 70406 |
15.14 |
| 2026-06-13 12:00 |
14:23:23.32 |
-52:08:37.0 |
HIP 70406 |
14.99 |
| 2026-06-14 00:00 |
14:23:13.49 |
-52:07:36.4 |
HIP 70406 |
15.04 |
| 2026-06-14 12:00 |
14:23:03.75 |
-52:06:35.6 |
HIP 70406 |
15.29 |
| 2026-06-15 00:00 |
14:22:54.11 |
-52:05:34.5 |
HIP 70406 |
15.74 |
| 2026-06-15 12:00 |
14:22:44.56 |
-52:04:33.1 |
HIP 70406 |
16.36 |
| 2026-06-16 00:00 |
14:22:35.11 |
-52:03:31.5 |
HIP 70406 |
17.13 |
| 2026-06-16 12:00 |
14:22:25.76 |
-52:02:29.7 |
HIP 70312 |
17.26 |
| 2026-06-17 00:00 |
14:22:16.50 |
-52:01:27.6 |
HIP 70312 |
16.92 |
| 2026-06-17 12:00 |
14:22:07.35 |
-52:00:25.3 |
HIP 70312 |
16.75 |
| 2026-06-18 00:00 |
14:21:58.29 |
-51:59:22.7 |
HIP 70312 |
16.74 |
| 2026-06-18 12:00 |
14:21:49.33 |
-51:58:20.0 |
HIP 70312 |
16.91 |
| 2026-06-19 00:00 |
14:21:40.47 |
-51:57:17.1 |
HIP 70312 |
17.24 |
| 2026-06-19 12:00 |
14:21:31.71 |
-51:56:13.9 |
HIP 70312 |
17.71 |
| 2026-06-20 00:00 |
14:21:23.05 |
-51:55:10.6 |
HIP 70312 |
18.32 |
| 2026-06-20 12:00 |
14:21:14.49 |
-51:54:07.1 |
HIP 70312 |
19.05 |
| 2026-06-21 00:00 |
14:21:06.03 |
-51:53:03.5 |
HIP 70312 |
19.88 |
| 2026-06-21 12:00 |
14:20:57.67 |
-51:51:59.6 |
HIP 70312 |
20.80 |
| 2026-06-22 00:00 |
14:20:49.42 |
-51:50:55.7 |
HIP 70312 |
21.79 |