メタデータ
| 項目 |
値 |
| Designation |
P/2020 T3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-20T11:20:03.816960Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:13:00Z |
| Obs used |
181 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
33.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-10T08:48:39.168000Z |
| Discovery magnitude (MPC) |
21.30 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) |
2020-12-02.0000000 |
| e |
0.59149152 |
| q (au) |
1.436615 |
| a (au) |
3.516732 |
| i (deg) |
7.295760 |
| Ω (om, deg) |
74.020875 |
| ω (w, deg) |
357.042704 |
| M (ma, deg) |
352.606384 |
等級
散乱 + 全体線形
$$
M_a = (15.642 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.642 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2020-09-09 |
2021-01-18 |
+15.9275 |
-3.268 |
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) |
| 2026-09-20 00:00 |
19:44:46.69 |
-28:34:36.2 |
HIP 97191 |
32.72 |
| 2026-09-20 12:00 |
19:44:42.44 |
-28:34:07.9 |
HIP 97191 |
33.36 |
| 2026-09-21 00:00 |
19:44:38.56 |
-28:33:38.5 |
HIP 97191 |
34.02 |
| 2026-09-21 12:00 |
19:44:35.04 |
-28:33:08.1 |
HIP 97191 |
34.69 |
| 2026-09-22 00:00 |
19:44:31.89 |
-28:32:36.6 |
HIP 97191 |
35.37 |
| 2026-09-22 12:00 |
19:44:29.11 |
-28:32:04.1 |
HIP 97191 |
36.05 |
| 2026-09-23 00:00 |
19:44:26.69 |
-28:31:30.6 |
HIP 97191 |
36.73 |
| 2026-09-23 12:00 |
19:44:24.63 |
-28:30:56.1 |
HIP 97191 |
37.41 |
| 2026-09-24 00:00 |
19:44:22.94 |
-28:30:20.5 |
HIP 97191 |
38.08 |
| 2026-09-24 12:00 |
19:44:21.62 |
-28:29:44.0 |
HIP 97191 |
38.75 |
| 2026-09-25 00:00 |
19:44:20.66 |
-28:29:06.5 |
HIP 97191 |
39.41 |
| 2026-09-25 12:00 |
19:44:20.06 |
-28:28:28.0 |
HIP 96899 |
39.81 |
| 2026-09-26 00:00 |
19:44:19.82 |
-28:27:48.6 |
HIP 96899 |
40.14 |
| 2026-09-26 12:00 |
19:44:19.95 |
-28:27:08.1 |
HIP 96899 |
40.56 |
| 2026-09-27 00:00 |
19:44:20.44 |
-28:26:26.8 |
HIP 96899 |
41.06 |
| 2026-09-27 12:00 |
19:44:21.29 |
-28:25:44.4 |
HIP 96899 |
41.64 |
| 2026-09-28 00:00 |
19:44:22.50 |
-28:25:01.2 |
HIP 96899 |
42.29 |
| 2026-09-28 12:00 |
19:44:24.07 |
-28:24:17.0 |
HIP 96899 |
43.02 |
| 2026-09-29 00:00 |
19:44:25.99 |
-28:23:31.8 |
HIP 96899 |
43.82 |
| 2026-09-29 12:00 |
19:44:28.28 |
-28:22:45.8 |
HIP 97401 |
44.47 |
| 2026-09-30 00:00 |
19:44:30.93 |
-28:21:58.8 |
HIP 97401 |
44.02 |
| 2026-09-30 12:00 |
19:44:33.93 |
-28:21:11.0 |
HIP 97401 |
43.52 |
| 2026-10-01 00:00 |
19:44:37.29 |
-28:20:22.2 |
HIP 97401 |
42.96 |
| 2026-10-01 12:00 |
19:44:41.01 |
-28:19:32.5 |
HIP 97401 |
42.35 |
| 2026-10-02 00:00 |
19:44:45.08 |
-28:18:41.9 |
HIP 97401 |
41.70 |
| 2026-10-02 12:00 |
19:44:49.51 |
-28:17:50.5 |
HIP 97401 |
40.99 |
| 2026-10-03 00:00 |
19:44:54.29 |
-28:16:58.1 |
HIP 97401 |
40.25 |
| 2026-10-03 12:00 |
19:44:59.42 |
-28:16:04.9 |
HIP 97401 |
39.47 |
| 2026-10-04 00:00 |
19:45:04.91 |
-28:15:10.8 |
HIP 97401 |
38.67 |
| 2026-10-04 12:00 |
19:45:10.75 |
-28:14:15.8 |
HIP 97401 |
37.84 |
| 2026-10-05 00:00 |
19:45:16.94 |
-28:13:20.0 |
HIP 97401 |
36.99 |
| 2026-10-05 12:00 |
19:45:23.49 |
-28:12:23.3 |
HIP 97401 |
36.14 |
| 2026-10-06 00:00 |
19:45:30.38 |
-28:11:25.7 |
HIP 97401 |
35.30 |
| 2026-10-06 12:00 |
19:45:37.62 |
-28:10:27.3 |
HIP 97401 |
34.47 |
| 2026-10-07 00:00 |
19:45:45.21 |
-28:09:28.0 |
HIP 97401 |
33.66 |
| 2026-10-07 12:00 |
19:45:53.15 |
-28:08:27.9 |
HIP 97401 |
32.91 |
| 2026-10-08 00:00 |
19:46:01.43 |
-28:07:26.9 |
HIP 97401 |
32.21 |
| 2026-10-08 12:00 |
19:46:10.06 |
-28:06:25.1 |
HIP 97401 |
31.60 |
| 2026-10-09 00:00 |
19:46:19.04 |
-28:05:22.5 |
HIP 97408 |
29.77 |
| 2026-10-09 12:00 |
19:46:28.35 |
-28:04:19.0 |
HIP 97408 |
27.60 |
| 2026-10-10 00:00 |
19:46:38.01 |
-28:03:14.7 |
HIP 97408 |
25.38 |
| 2026-10-10 12:00 |
19:46:48.01 |
-28:02:09.5 |
HIP 97408 |
23.14 |
| 2026-10-11 00:00 |
19:46:58.35 |
-28:01:03.5 |
HIP 97408 |
20.90 |