メタデータ
| 項目 |
値 |
| Designation |
C/2016 A6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-11-05T22:12:03.853440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
28.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-01-20.0000000 |
| e |
0.99059983 |
| q (au) |
2.412923 |
| a (au) |
256.689319 |
| i (deg) |
120.934185 |
| Ω (om, deg) |
300.253669 |
| ω (w, deg) |
141.118673 |
| M (ma, deg) |
0.017992 |
等級
散乱 + 全体線形
$$
M_a = (16.450 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.450 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.764 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
02:12:52.18 |
-50:07:26.9 |
HIP 10421 |
20.94 |
| 2026-09-20 12:00 |
02:12:45.91 |
-50:08:15.8 |
HIP 10421 |
22.22 |
| 2026-09-21 00:00 |
02:12:39.59 |
-50:09:04.4 |
HIP 10421 |
23.50 |
| 2026-09-21 12:00 |
02:12:33.23 |
-50:09:52.5 |
HIP 10421 |
24.78 |
| 2026-09-22 00:00 |
02:12:26.84 |
-50:10:40.2 |
HIP 10421 |
26.06 |
| 2026-09-22 12:00 |
02:12:20.41 |
-50:11:27.5 |
HIP 10421 |
27.34 |
| 2026-09-23 00:00 |
02:12:13.94 |
-50:12:14.3 |
HIP 10421 |
28.62 |
| 2026-09-23 12:00 |
02:12:07.43 |
-50:13:00.8 |
HIP 10421 |
29.91 |
| 2026-09-24 00:00 |
02:12:00.88 |
-50:13:46.8 |
HIP 10421 |
31.19 |
| 2026-09-24 12:00 |
02:11:54.30 |
-50:14:32.4 |
HIP 10421 |
32.47 |
| 2026-09-25 00:00 |
02:11:47.68 |
-50:15:17.5 |
HIP 10421 |
33.75 |
| 2026-09-25 12:00 |
02:11:41.03 |
-50:16:02.2 |
HIP 10421 |
35.04 |
| 2026-09-26 00:00 |
02:11:34.34 |
-50:16:46.4 |
HIP 10138 |
34.60 |
| 2026-09-26 12:00 |
02:11:27.62 |
-50:17:30.3 |
HIP 10138 |
33.57 |
| 2026-09-27 00:00 |
02:11:20.86 |
-50:18:13.6 |
HIP 10138 |
32.57 |
| 2026-09-27 12:00 |
02:11:14.07 |
-50:18:56.5 |
HIP 10138 |
31.59 |
| 2026-09-28 00:00 |
02:11:07.24 |
-50:19:39.0 |
HIP 10138 |
30.65 |
| 2026-09-28 12:00 |
02:11:00.39 |
-50:20:20.9 |
HIP 10138 |
29.74 |
| 2026-09-29 00:00 |
02:10:53.50 |
-50:21:02.5 |
HIP 10138 |
28.86 |
| 2026-09-29 12:00 |
02:10:46.58 |
-50:21:43.5 |
HIP 10138 |
28.02 |
| 2026-09-30 00:00 |
02:10:39.62 |
-50:22:24.1 |
HIP 10138 |
27.23 |
| 2026-09-30 12:00 |
02:10:32.64 |
-50:23:04.2 |
HIP 10138 |
26.48 |
| 2026-10-01 00:00 |
02:10:25.63 |
-50:23:43.8 |
HIP 10138 |
25.79 |
| 2026-10-01 12:00 |
02:10:18.58 |
-50:24:23.0 |
HIP 10138 |
25.15 |
| 2026-10-02 00:00 |
02:10:11.51 |
-50:25:01.6 |
HIP 10138 |
24.57 |
| 2026-10-02 12:00 |
02:10:04.41 |
-50:25:39.8 |
HIP 10138 |
24.06 |
| 2026-10-03 00:00 |
02:09:57.28 |
-50:26:17.5 |
HIP 10138 |
23.61 |
| 2026-10-03 12:00 |
02:09:50.12 |
-50:26:54.7 |
HIP 10138 |
23.24 |
| 2026-10-04 00:00 |
02:09:42.93 |
-50:27:31.4 |
HIP 10138 |
22.94 |
| 2026-10-04 12:00 |
02:09:35.72 |
-50:28:07.5 |
HIP 10138 |
22.72 |
| 2026-10-05 00:00 |
02:09:28.48 |
-50:28:43.2 |
HIP 10138 |
22.58 |
| 2026-10-05 12:00 |
02:09:21.22 |
-50:29:18.4 |
HIP 10138 |
22.53 |
| 2026-10-06 00:00 |
02:09:13.93 |
-50:29:53.0 |
HIP 10138 |
22.56 |
| 2026-10-06 12:00 |
02:09:06.62 |
-50:30:27.2 |
HIP 9872 |
21.60 |
| 2026-10-07 00:00 |
02:08:59.28 |
-50:31:00.8 |
HIP 9872 |
20.31 |
| 2026-10-07 12:00 |
02:08:51.92 |
-50:31:33.9 |
HIP 9872 |
19.02 |
| 2026-10-08 00:00 |
02:08:44.53 |
-50:32:06.4 |
HIP 9872 |
17.73 |
| 2026-10-08 12:00 |
02:08:37.13 |
-50:32:38.5 |
HIP 9872 |
16.44 |
| 2026-10-09 00:00 |
02:08:29.70 |
-50:33:10.0 |
HIP 9872 |
15.15 |
| 2026-10-09 12:00 |
02:08:22.25 |
-50:33:41.0 |
HIP 9872 |
13.86 |
| 2026-10-10 00:00 |
02:08:14.78 |
-50:34:11.4 |
HIP 9872 |
12.58 |
| 2026-10-10 12:00 |
02:08:07.30 |
-50:34:41.3 |
HIP 9872 |
11.29 |
| 2026-10-11 00:00 |
02:07:59.79 |
-50:35:10.6 |
HIP 9872 |
10.00 |