メタデータ
| 項目 |
値 |
| Designation |
C/2015 T4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-06-18T22:43:23.779200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:15Z |
| Obs used |
345 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
16.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-16.0000000 |
| e |
0.97361730 |
| q (au) |
2.296377 |
| a (au) |
87.040989 |
| i (deg) |
87.917192 |
| Ω (om, deg) |
251.787616 |
| ω (w, deg) |
270.135756 |
| M (ma, deg) |
359.774313 |
等級
散乱 + 全体線形
$$
M_a = (8.288 + 5.229\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.288 |
| n |
5.229 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.998 |
| 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) |
| 2026-05-12 00:00 |
17:25:28.28 |
+34:38:02.2 |
HIP 85238 |
7.81 |
| 2026-05-12 12:00 |
17:25:22.98 |
+34:38:45.6 |
HIP 85238 |
6.56 |
| 2026-05-13 00:00 |
17:25:17.64 |
+34:39:28.5 |
HIP 85238 |
5.34 |
| 2026-05-13 12:00 |
17:25:12.27 |
+34:40:10.9 |
HIP 85238 |
4.17 |
| 2026-05-14 00:00 |
17:25:06.88 |
+34:40:52.8 |
HIP 85238 |
3.13 |
| 2026-05-14 12:00 |
17:25:01.46 |
+34:41:34.2 |
HIP 85238 |
2.38 |
| 2026-05-15 00:00 |
17:24:56.01 |
+34:42:15.1 |
HIP 85238 |
2.24 |
| 2026-05-15 12:00 |
17:24:50.53 |
+34:42:55.5 |
HIP 85238 |
2.80 |
| 2026-05-16 00:00 |
17:24:45.03 |
+34:43:35.4 |
HIP 85238 |
3.77 |
| 2026-05-16 12:00 |
17:24:39.50 |
+34:44:14.8 |
HIP 85238 |
4.90 |
| 2026-05-17 00:00 |
17:24:33.95 |
+34:44:53.7 |
HIP 85238 |
6.10 |
| 2026-05-17 12:00 |
17:24:28.37 |
+34:45:32.1 |
HIP 85238 |
7.35 |
| 2026-05-18 00:00 |
17:24:22.77 |
+34:46:09.9 |
HIP 85238 |
8.62 |
| 2026-05-18 12:00 |
17:24:17.14 |
+34:46:47.2 |
HIP 85238 |
9.90 |
| 2026-05-19 00:00 |
17:24:11.49 |
+34:47:24.0 |
HIP 85238 |
11.19 |
| 2026-05-19 12:00 |
17:24:05.82 |
+34:48:00.3 |
HIP 85238 |
12.49 |
| 2026-05-20 00:00 |
17:24:00.12 |
+34:48:36.0 |
HIP 85238 |
13.79 |
| 2026-05-20 12:00 |
17:23:54.40 |
+34:49:11.2 |
HIP 85238 |
15.09 |
| 2026-05-21 00:00 |
17:23:48.66 |
+34:49:45.9 |
HIP 85238 |
16.40 |
| 2026-05-21 12:00 |
17:23:42.90 |
+34:50:20.0 |
HIP 85238 |
17.71 |
| 2026-05-22 00:00 |
17:23:37.12 |
+34:50:53.6 |
HIP 85238 |
19.01 |
| 2026-05-22 12:00 |
17:23:31.32 |
+34:51:26.6 |
HIP 85014 |
18.85 |
| 2026-05-23 00:00 |
17:23:25.50 |
+34:51:59.1 |
HIP 85014 |
18.52 |
| 2026-05-23 12:00 |
17:23:19.67 |
+34:52:31.1 |
HIP 85014 |
18.27 |
| 2026-05-24 00:00 |
17:23:13.81 |
+34:53:02.5 |
HIP 85014 |
18.11 |
| 2026-05-24 12:00 |
17:23:07.93 |
+34:53:33.4 |
HIP 85014 |
18.03 |
| 2026-05-25 00:00 |
17:23:02.04 |
+34:54:03.7 |
HIP 85014 |
18.04 |
| 2026-05-25 12:00 |
17:22:56.13 |
+34:54:33.5 |
HIP 85014 |
18.13 |
| 2026-05-26 00:00 |
17:22:50.21 |
+34:55:02.8 |
HIP 85014 |
18.30 |
| 2026-05-26 12:00 |
17:22:44.27 |
+34:55:31.4 |
HIP 85014 |
18.56 |
| 2026-05-27 00:00 |
17:22:38.31 |
+34:55:59.6 |
HIP 85014 |
18.90 |
| 2026-05-27 12:00 |
17:22:32.34 |
+34:56:27.1 |
HIP 85014 |
19.31 |
| 2026-05-28 00:00 |
17:22:26.35 |
+34:56:54.2 |
HIP 85014 |
19.78 |
| 2026-05-28 12:00 |
17:22:20.35 |
+34:57:20.6 |
HIP 85014 |
20.33 |
| 2026-05-29 00:00 |
17:22:14.34 |
+34:57:46.5 |
HIP 85014 |
20.93 |
| 2026-05-29 12:00 |
17:22:08.31 |
+34:58:11.9 |
HIP 85014 |
21.58 |
| 2026-05-30 00:00 |
17:22:02.27 |
+34:58:36.7 |
HIP 85014 |
22.29 |
| 2026-05-30 12:00 |
17:21:56.22 |
+34:59:00.9 |
HIP 85014 |
23.04 |
| 2026-05-31 00:00 |
17:21:50.16 |
+34:59:24.6 |
HIP 85014 |
23.83 |
| 2026-05-31 12:00 |
17:21:44.08 |
+34:59:47.7 |
HIP 85014 |
24.65 |
| 2026-06-01 00:00 |
17:21:38.00 |
+35:00:10.2 |
HIP 85014 |
25.51 |
| 2026-06-01 12:00 |
17:21:31.90 |
+35:00:32.2 |
HIP 84847 |
25.35 |
| 2026-06-02 00:00 |
17:21:25.80 |
+35:00:53.6 |
HIP 84847 |
24.42 |