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) |
| 2026-06-01 00:00 |
02:14:31.87 |
-46:43:49.5 |
HIP 10574 |
18.68 |
| 2026-06-01 12:00 |
02:14:36.59 |
-46:44:16.3 |
HIP 10574 |
17.75 |
| 2026-06-02 00:00 |
02:14:41.29 |
-46:44:43.6 |
HIP 10574 |
16.83 |
| 2026-06-02 12:00 |
02:14:45.96 |
-46:45:11.3 |
HIP 10574 |
15.91 |
| 2026-06-03 00:00 |
02:14:50.61 |
-46:45:39.6 |
HIP 10574 |
14.98 |
| 2026-06-03 12:00 |
02:14:55.22 |
-46:46:08.2 |
HIP 10574 |
14.06 |
| 2026-06-04 00:00 |
02:14:59.80 |
-46:46:37.4 |
HIP 10574 |
13.14 |
| 2026-06-04 12:00 |
02:15:04.35 |
-46:47:07.0 |
HIP 10574 |
12.22 |
| 2026-06-05 00:00 |
02:15:08.87 |
-46:47:37.1 |
HIP 10574 |
11.30 |
| 2026-06-05 12:00 |
02:15:13.35 |
-46:48:07.6 |
HIP 10574 |
10.38 |
| 2026-06-06 00:00 |
02:15:17.81 |
-46:48:38.7 |
HIP 10574 |
9.46 |
| 2026-06-06 12:00 |
02:15:22.23 |
-46:49:10.1 |
HIP 10574 |
8.55 |
| 2026-06-07 00:00 |
02:15:26.63 |
-46:49:42.1 |
HIP 10574 |
7.64 |
| 2026-06-07 12:00 |
02:15:30.99 |
-46:50:14.4 |
HIP 10574 |
6.73 |
| 2026-06-08 00:00 |
02:15:35.31 |
-46:50:47.3 |
HIP 10574 |
5.83 |
| 2026-06-08 12:00 |
02:15:39.61 |
-46:51:20.6 |
HIP 10574 |
4.95 |
| 2026-06-09 00:00 |
02:15:43.86 |
-46:51:54.4 |
HIP 10574 |
4.08 |
| 2026-06-09 12:00 |
02:15:48.09 |
-46:52:28.6 |
HIP 10574 |
3.24 |
| 2026-06-10 00:00 |
02:15:52.28 |
-46:53:03.2 |
HIP 10574 |
2.46 |
| 2026-06-10 12:00 |
02:15:56.44 |
-46:53:38.3 |
HIP 10574 |
1.84 |
| 2026-06-11 00:00 |
02:16:00.56 |
-46:54:13.9 |
HIP 10574 |
1.56 |
| 2026-06-11 12:00 |
02:16:04.65 |
-46:54:49.9 |
HIP 10574 |
1.79 |
| 2026-06-12 00:00 |
02:16:08.70 |
-46:55:26.3 |
HIP 10574 |
2.39 |
| 2026-06-12 12:00 |
02:16:12.71 |
-46:56:03.2 |
HIP 10574 |
3.15 |
| 2026-06-13 00:00 |
02:16:16.69 |
-46:56:40.5 |
HIP 10574 |
3.98 |
| 2026-06-13 12:00 |
02:16:20.63 |
-46:57:18.3 |
HIP 10574 |
4.85 |
| 2026-06-14 00:00 |
02:16:24.53 |
-46:57:56.5 |
HIP 10574 |
5.74 |
| 2026-06-14 12:00 |
02:16:28.40 |
-46:58:35.1 |
HIP 10620 |
5.39 |
| 2026-06-15 00:00 |
02:16:32.22 |
-46:59:14.2 |
HIP 10620 |
4.51 |
| 2026-06-15 12:00 |
02:16:36.01 |
-46:59:53.7 |
HIP 10620 |
3.65 |
| 2026-06-16 00:00 |
02:16:39.76 |
-47:00:33.6 |
HIP 10620 |
2.82 |
| 2026-06-16 12:00 |
02:16:43.47 |
-47:01:13.9 |
HIP 10620 |
2.06 |
| 2026-06-17 00:00 |
02:16:47.15 |
-47:01:54.7 |
HIP 10620 |
1.49 |
| 2026-06-17 12:00 |
02:16:50.78 |
-47:02:35.9 |
HIP 10620 |
1.37 |
| 2026-06-18 00:00 |
02:16:54.37 |
-47:03:17.5 |
HIP 10620 |
1.80 |
| 2026-06-18 12:00 |
02:16:57.92 |
-47:03:59.5 |
HIP 10620 |
2.50 |
| 2026-06-19 00:00 |
02:17:01.44 |
-47:04:41.9 |
HIP 10620 |
3.31 |
| 2026-06-19 12:00 |
02:17:04.91 |
-47:05:24.7 |
HIP 10620 |
4.17 |
| 2026-06-20 00:00 |
02:17:08.34 |
-47:06:07.9 |
HIP 10620 |
5.05 |
| 2026-06-20 12:00 |
02:17:11.72 |
-47:06:51.5 |
HIP 10620 |
5.94 |
| 2026-06-21 00:00 |
02:17:15.07 |
-47:07:35.5 |
HIP 10620 |
6.84 |
| 2026-06-21 12:00 |
02:17:18.37 |
-47:08:20.0 |
HIP 10620 |
7.75 |
| 2026-06-22 00:00 |
02:17:21.64 |
-47:09:04.8 |
HIP 10620 |
8.66 |