メタデータ
| 項目 |
値 |
| Designation |
C/2016 N6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-07-18T04:53:54.179520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
3071 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-01.0000000 |
| e |
0.99865186 |
| q (au) |
2.669116 |
| a (au) |
1979.851996 |
| i (deg) |
105.830421 |
| Ω (om, deg) |
298.977675 |
| ω (w, deg) |
162.803199 |
| M (ma, deg) |
359.998129 |
等級
散乱 + 全体線形
$$
M_a = (9.902 + 3.333\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.902 |
| n |
3.333 |
| gf |
1.000 |
| gb |
-0.687 |
| 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 |
| 2016-06-27 |
2016-10-28 |
+38.9147 |
-31.451 |
| 2016-10-28 |
2018-06-20 |
+1.1594 |
-0.936 |
| 2018-08-28 |
2019-01-14 |
+13.3133 |
-6.770 |
| 2019-01-14 |
2020-12-12 |
-0.7531 |
+0.155 |
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) |
| 2026-03-26 00:00 |
00:21:44.97 |
-60:46:49.8 |
HIP 1582 |
16.21 |
| 2026-03-26 12:00 |
00:21:54.74 |
-60:46:30.4 |
HIP 1777 |
16.30 |
| 2026-03-27 00:00 |
00:22:04.50 |
-60:46:11.5 |
HIP 1777 |
16.30 |
| 2026-03-27 12:00 |
00:22:14.27 |
-60:45:53.4 |
HIP 1777 |
16.38 |
| 2026-03-28 00:00 |
00:22:24.03 |
-60:45:35.8 |
HIP 1777 |
16.54 |
| 2026-03-28 12:00 |
00:22:33.78 |
-60:45:19.0 |
HIP 1777 |
16.78 |
| 2026-03-29 00:00 |
00:22:43.53 |
-60:45:02.7 |
HIP 1777 |
17.09 |
| 2026-03-29 12:00 |
00:22:53.28 |
-60:44:47.1 |
HIP 1777 |
17.46 |
| 2026-03-30 00:00 |
00:23:03.01 |
-60:44:32.1 |
HIP 1777 |
17.91 |
| 2026-03-30 12:00 |
00:23:12.75 |
-60:44:17.8 |
HIP 1777 |
18.41 |
| 2026-03-31 00:00 |
00:23:22.47 |
-60:44:04.1 |
HIP 1777 |
18.96 |
| 2026-03-31 12:00 |
00:23:32.19 |
-60:43:51.1 |
HIP 1777 |
19.56 |
| 2026-04-01 00:00 |
00:23:41.90 |
-60:43:38.7 |
HIP 1777 |
20.21 |
| 2026-04-01 12:00 |
00:23:51.60 |
-60:43:27.0 |
HIP 1777 |
20.89 |
| 2026-04-02 00:00 |
00:24:01.29 |
-60:43:15.8 |
HIP 1777 |
21.61 |
| 2026-04-02 12:00 |
00:24:10.97 |
-60:43:05.4 |
HIP 1777 |
22.36 |
| 2026-04-03 00:00 |
00:24:20.64 |
-60:42:55.6 |
HIP 1777 |
23.14 |
| 2026-04-03 12:00 |
00:24:30.30 |
-60:42:46.4 |
HIP 1777 |
23.94 |
| 2026-04-04 00:00 |
00:24:39.95 |
-60:42:37.9 |
HIP 1777 |
24.76 |
| 2026-04-04 12:00 |
00:24:49.58 |
-60:42:30.0 |
HIP 1777 |
25.61 |
| 2026-04-05 00:00 |
00:24:59.20 |
-60:42:22.8 |
HIP 1777 |
26.47 |
| 2026-04-05 12:00 |
00:25:08.81 |
-60:42:16.2 |
HIP 2260 |
27.30 |
| 2026-04-06 00:00 |
00:25:18.41 |
-60:42:10.3 |
HIP 2260 |
26.16 |
| 2026-04-06 12:00 |
00:25:27.99 |
-60:42:05.0 |
HIP 2260 |
25.02 |
| 2026-04-07 00:00 |
00:25:37.55 |
-60:42:00.4 |
HIP 2260 |
23.89 |
| 2026-04-07 12:00 |
00:25:47.10 |
-60:41:56.4 |
HIP 2260 |
22.76 |
| 2026-04-08 00:00 |
00:25:56.64 |
-60:41:53.1 |
HIP 2260 |
21.63 |
| 2026-04-08 12:00 |
00:26:06.15 |
-60:41:50.4 |
HIP 2260 |
20.50 |
| 2026-04-09 00:00 |
00:26:15.65 |
-60:41:48.4 |
HIP 2260 |
19.38 |
| 2026-04-09 12:00 |
00:26:25.14 |
-60:41:47.0 |
HIP 2260 |
18.27 |
| 2026-04-10 00:00 |
00:26:34.60 |
-60:41:46.3 |
HIP 2260 |
17.15 |
| 2026-04-10 12:00 |
00:26:44.04 |
-60:41:46.2 |
HIP 2260 |
16.05 |
| 2026-04-11 00:00 |
00:26:53.47 |
-60:41:46.8 |
HIP 2260 |
14.95 |
| 2026-04-11 12:00 |
00:27:02.87 |
-60:41:48.1 |
HIP 2260 |
13.85 |
| 2026-04-12 00:00 |
00:27:12.25 |
-60:41:50.0 |
HIP 2260 |
12.77 |
| 2026-04-12 12:00 |
00:27:21.61 |
-60:41:52.5 |
HIP 2260 |
11.69 |
| 2026-04-13 00:00 |
00:27:30.95 |
-60:41:55.7 |
HIP 2260 |
10.63 |
| 2026-04-13 12:00 |
00:27:40.27 |
-60:41:59.6 |
HIP 2260 |
9.58 |
| 2026-04-14 00:00 |
00:27:49.56 |
-60:42:04.1 |
HIP 2260 |
8.56 |
| 2026-04-14 12:00 |
00:27:58.83 |
-60:42:09.3 |
HIP 2260 |
7.56 |
| 2026-04-15 00:00 |
00:28:08.07 |
-60:42:15.1 |
HIP 2260 |
6.60 |
| 2026-04-15 12:00 |
00:28:17.29 |
-60:42:21.6 |
HIP 2260 |
5.70 |
| 2026-04-16 00:00 |
00:28:26.49 |
-60:42:28.8 |
HIP 2260 |
4.90 |