メタデータ
| 項目 |
値 |
| Designation |
C/2016 A5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-06-28T07:50:25.661760Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:22Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
11.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-22.0000000 |
| e |
0.99730397 |
| q (au) |
2.947450 |
| a (au) |
1093.256056 |
| i (deg) |
40.327049 |
| Ω (om, deg) |
136.218315 |
| ω (w, deg) |
321.625267 |
| M (ma, deg) |
0.004817 |
等級
散乱 + 全体線形
$$
M_a = (12.549 + 4.558\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.549 |
| n |
4.558 |
| gf |
0.971 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
16:20:38.10 |
+19:01:14.6 |
HIP 79968 |
18.30 |
| 2026-07-29 12:00 |
16:20:36.10 |
+19:00:37.3 |
HIP 79968 |
17.92 |
| 2026-07-30 00:00 |
16:20:34.13 |
+18:59:59.7 |
HIP 79968 |
17.57 |
| 2026-07-30 12:00 |
16:20:32.20 |
+18:59:21.9 |
HIP 79968 |
17.27 |
| 2026-07-31 00:00 |
16:20:30.30 |
+18:58:43.8 |
HIP 79968 |
17.00 |
| 2026-07-31 12:00 |
16:20:28.45 |
+18:58:05.6 |
HIP 79968 |
16.78 |
| 2026-08-01 00:00 |
16:20:26.63 |
+18:57:27.1 |
HIP 79968 |
16.60 |
| 2026-08-01 12:00 |
16:20:24.85 |
+18:56:48.3 |
HIP 79968 |
16.46 |
| 2026-08-02 00:00 |
16:20:23.10 |
+18:56:09.4 |
HIP 79968 |
16.37 |
| 2026-08-02 12:00 |
16:20:21.40 |
+18:55:30.2 |
HIP 79968 |
16.32 |
| 2026-08-03 00:00 |
16:20:19.73 |
+18:54:50.8 |
HIP 79968 |
16.32 |
| 2026-08-03 12:00 |
16:20:18.10 |
+18:54:11.2 |
HIP 79968 |
16.36 |
| 2026-08-04 00:00 |
16:20:16.51 |
+18:53:31.4 |
HIP 79968 |
16.45 |
| 2026-08-04 12:00 |
16:20:14.95 |
+18:52:51.4 |
HIP 79968 |
16.58 |
| 2026-08-05 00:00 |
16:20:13.44 |
+18:52:11.2 |
HIP 79968 |
16.75 |
| 2026-08-05 12:00 |
16:20:11.96 |
+18:51:30.8 |
HIP 79968 |
16.97 |
| 2026-08-06 00:00 |
16:20:10.52 |
+18:50:50.1 |
HIP 79968 |
17.22 |
| 2026-08-06 12:00 |
16:20:09.12 |
+18:50:09.3 |
HIP 79968 |
17.52 |
| 2026-08-07 00:00 |
16:20:07.76 |
+18:49:28.3 |
HIP 79968 |
17.84 |
| 2026-08-07 12:00 |
16:20:06.44 |
+18:48:47.0 |
HIP 79968 |
18.21 |
| 2026-08-08 00:00 |
16:20:05.16 |
+18:48:05.6 |
HIP 79968 |
18.60 |
| 2026-08-08 12:00 |
16:20:03.91 |
+18:47:24.0 |
HIP 79968 |
19.02 |
| 2026-08-09 00:00 |
16:20:02.71 |
+18:46:42.3 |
HIP 79968 |
19.47 |
| 2026-08-09 12:00 |
16:20:01.54 |
+18:46:00.3 |
HIP 79968 |
19.94 |
| 2026-08-10 00:00 |
16:20:00.42 |
+18:45:18.2 |
HIP 79968 |
20.44 |
| 2026-08-10 12:00 |
16:19:59.33 |
+18:44:35.9 |
HIP 79968 |
20.96 |
| 2026-08-11 00:00 |
16:19:58.29 |
+18:43:53.4 |
HIP 79968 |
21.50 |
| 2026-08-11 12:00 |
16:19:57.28 |
+18:43:10.7 |
HIP 79968 |
22.06 |
| 2026-08-12 00:00 |
16:19:56.32 |
+18:42:27.9 |
HIP 79968 |
22.64 |
| 2026-08-12 12:00 |
16:19:55.39 |
+18:41:44.9 |
HIP 79968 |
23.23 |
| 2026-08-13 00:00 |
16:19:54.50 |
+18:41:01.8 |
HIP 79968 |
23.83 |
| 2026-08-13 12:00 |
16:19:53.66 |
+18:40:18.5 |
HIP 79968 |
24.45 |
| 2026-08-14 00:00 |
16:19:52.85 |
+18:39:35.0 |
HIP 79968 |
25.08 |
| 2026-08-14 12:00 |
16:19:52.09 |
+18:38:51.4 |
HIP 79968 |
25.73 |
| 2026-08-15 00:00 |
16:19:51.37 |
+18:38:07.7 |
HIP 79968 |
26.38 |
| 2026-08-15 12:00 |
16:19:50.68 |
+18:37:23.8 |
HIP 79968 |
27.04 |
| 2026-08-16 00:00 |
16:19:50.04 |
+18:36:39.8 |
HIP 79968 |
27.71 |
| 2026-08-16 12:00 |
16:19:49.44 |
+18:35:55.7 |
HIP 79968 |
28.40 |
| 2026-08-17 00:00 |
16:19:48.87 |
+18:35:11.4 |
HIP 79968 |
29.08 |
| 2026-08-17 12:00 |
16:19:48.35 |
+18:34:27.0 |
HIP 79968 |
29.78 |
| 2026-08-18 00:00 |
16:19:47.87 |
+18:33:42.4 |
HIP 79968 |
30.48 |
| 2026-08-18 12:00 |
16:19:47.43 |
+18:32:57.8 |
HIP 79968 |
31.19 |
| 2026-08-19 00:00 |
16:19:47.03 |
+18:32:13.0 |
HIP 79968 |
31.90 |