メタデータ
| 項目 |
値 |
| Designation |
C/2017 T2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-05-04T22:47:55.688640Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:25Z |
| Obs used |
6922 |
| NEO |
- |
| M1 |
10.200 |
| 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) |
2019-12-13.0000000 |
| e |
0.99967750 |
| q (au) |
1.615095 |
| a (au) |
5008.050241 |
| i (deg) |
57.231440 |
| Ω (om, deg) |
64.378780 |
| ω (w, deg) |
92.993316 |
| M (ma, deg) |
359.999600 |
等級
散乱 + 全体線形
$$
M_a = (10.827 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.827 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.653 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2017-09-15 |
2019-08-05 |
+4.1328 |
-3.262 |
| 2019-08-05 |
2020-01-09 |
-1.8797 |
+0.423 |
| 2020-01-09 |
2020-05-04 |
+5.4565 |
-2.847 |
| 2020-05-05 |
2020-08-08 |
+15.7863 |
-4.493 |
| 2020-08-08 |
2021-10-04 |
+3.9198 |
-1.129 |
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 |
20:15:29.21 |
-68:29:41.9 |
HIP 99850 |
3.75 |
| 2026-06-01 12:00 |
20:15:19.28 |
-68:30:56.2 |
HIP 99850 |
5.07 |
| 2026-06-02 00:00 |
20:15:09.22 |
-68:32:10.2 |
HIP 99850 |
6.48 |
| 2026-06-02 12:00 |
20:14:59.02 |
-68:33:23.8 |
HIP 99850 |
7.94 |
| 2026-06-03 00:00 |
20:14:48.67 |
-68:34:37.0 |
HIP 99850 |
9.43 |
| 2026-06-03 12:00 |
20:14:38.19 |
-68:35:49.9 |
HIP 99850 |
10.93 |
| 2026-06-04 00:00 |
20:14:27.57 |
-68:37:02.4 |
HIP 99850 |
12.44 |
| 2026-06-04 12:00 |
20:14:16.81 |
-68:38:14.5 |
HIP 99850 |
13.96 |
| 2026-06-05 00:00 |
20:14:05.91 |
-68:39:26.2 |
HIP 99481 |
14.92 |
| 2026-06-05 12:00 |
20:13:54.87 |
-68:40:37.5 |
HIP 99481 |
14.13 |
| 2026-06-06 00:00 |
20:13:43.70 |
-68:41:48.4 |
HIP 99481 |
13.46 |
| 2026-06-06 12:00 |
20:13:32.39 |
-68:42:58.9 |
HIP 99481 |
12.93 |
| 2026-06-07 00:00 |
20:13:20.95 |
-68:44:09.0 |
HIP 99481 |
12.56 |
| 2026-06-07 12:00 |
20:13:09.37 |
-68:45:18.7 |
HIP 99481 |
12.37 |
| 2026-06-08 00:00 |
20:12:57.66 |
-68:46:27.9 |
HIP 99481 |
12.36 |
| 2026-06-08 12:00 |
20:12:45.82 |
-68:47:36.7 |
HIP 99481 |
12.54 |
| 2026-06-09 00:00 |
20:12:33.85 |
-68:48:45.1 |
HIP 99481 |
12.89 |
| 2026-06-09 12:00 |
20:12:21.75 |
-68:49:53.0 |
HIP 99481 |
13.41 |
| 2026-06-10 00:00 |
20:12:09.51 |
-68:51:00.4 |
HIP 99481 |
14.08 |
| 2026-06-10 12:00 |
20:11:57.15 |
-68:52:07.4 |
HIP 99481 |
14.88 |
| 2026-06-11 00:00 |
20:11:44.66 |
-68:53:13.9 |
HIP 99481 |
15.79 |
| 2026-06-11 12:00 |
20:11:32.04 |
-68:54:19.9 |
HIP 99237 |
15.90 |
| 2026-06-12 00:00 |
20:11:19.30 |
-68:55:25.4 |
HIP 99237 |
14.55 |
| 2026-06-12 12:00 |
20:11:06.43 |
-68:56:30.4 |
HIP 99237 |
13.23 |
| 2026-06-13 00:00 |
20:10:53.44 |
-68:57:35.0 |
HIP 99237 |
11.98 |
| 2026-06-13 12:00 |
20:10:40.32 |
-68:58:39.0 |
HIP 99237 |
10.80 |
| 2026-06-14 00:00 |
20:10:27.09 |
-68:59:42.5 |
HIP 99237 |
9.74 |
| 2026-06-14 12:00 |
20:10:13.73 |
-69:00:45.5 |
HIP 99237 |
8.82 |
| 2026-06-15 00:00 |
20:10:00.25 |
-69:01:47.9 |
HIP 99237 |
8.10 |
| 2026-06-15 12:00 |
20:09:46.66 |
-69:02:49.8 |
HIP 99237 |
7.63 |
| 2026-06-16 00:00 |
20:09:32.95 |
-69:03:51.2 |
HIP 99237 |
7.47 |
| 2026-06-16 12:00 |
20:09:19.13 |
-69:04:52.1 |
HIP 99237 |
7.64 |
| 2026-06-17 00:00 |
20:09:05.19 |
-69:05:52.3 |
HIP 99237 |
8.12 |
| 2026-06-17 12:00 |
20:08:51.14 |
-69:06:52.0 |
HIP 99237 |
8.85 |
| 2026-06-18 00:00 |
20:08:36.97 |
-69:07:51.2 |
HIP 99237 |
9.79 |
| 2026-06-18 12:00 |
20:08:22.70 |
-69:08:49.8 |
HIP 99237 |
10.87 |
| 2026-06-19 00:00 |
20:08:08.32 |
-69:09:47.7 |
HIP 99237 |
12.06 |
| 2026-06-19 12:00 |
20:07:53.84 |
-69:10:45.1 |
HIP 99237 |
13.34 |
| 2026-06-20 00:00 |
20:07:39.25 |
-69:11:42.0 |
HIP 99237 |
14.67 |
| 2026-06-20 12:00 |
20:07:24.55 |
-69:12:38.2 |
HIP 99237 |
16.05 |
| 2026-06-21 00:00 |
20:07:09.76 |
-69:13:33.8 |
HIP 99237 |
17.46 |
| 2026-06-21 12:00 |
20:06:54.86 |
-69:14:28.8 |
HIP 99237 |
18.90 |
| 2026-06-22 00:00 |
20:06:39.87 |
-69:15:23.2 |
HIP 99104 |
18.19 |