メタデータ
| 項目 |
値 |
| Designation |
C/2016 N4 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-09-16T14:17:55.443840Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:42:28Z |
| Obs used |
2084 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-09-11.0000000 |
| e |
0.99939359 |
| q (au) |
3.199121 |
| a (au) |
5275.516225 |
| i (deg) |
72.557241 |
| Ω (om, deg) |
354.031309 |
| ω (w, deg) |
55.954990 |
| M (ma, deg) |
359.999986 |
等級
散乱 + 全体線形
$$
M_a = (12.927 + 2.762\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.927 |
| n |
2.762 |
| gf |
0.997 |
| gb |
-0.817 |
| 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 |
| 2015-09-11 |
2016-10-30 |
+2.0258 |
-1.477 |
| 2016-10-30 |
2017-09-16 |
-2.1552 |
+0.913 |
| 2017-09-16 |
2020-03-26 |
+1.1161 |
-0.650 |
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 |
11:31:40.79 |
-07:33:25.7 |
HIP 56318 |
23.17 |
| 2026-03-26 12:00 |
11:31:35.29 |
-07:32:58.9 |
HIP 56318 |
24.46 |
| 2026-03-27 00:00 |
11:31:29.80 |
-07:32:32.0 |
HIP 56318 |
25.77 |
| 2026-03-27 12:00 |
11:31:24.33 |
-07:32:05.1 |
HIP 56318 |
27.09 |
| 2026-03-28 00:00 |
11:31:18.87 |
-07:31:38.1 |
HIP 56318 |
28.41 |
| 2026-03-28 12:00 |
11:31:13.43 |
-07:31:11.0 |
HIP 56318 |
29.75 |
| 2026-03-29 00:00 |
11:31:08.00 |
-07:30:43.9 |
HIP 56318 |
31.08 |
| 2026-03-29 12:00 |
11:31:02.59 |
-07:30:16.8 |
HIP 56318 |
32.43 |
| 2026-03-30 00:00 |
11:30:57.19 |
-07:29:49.6 |
HIP 56318 |
33.77 |
| 2026-03-30 12:00 |
11:30:51.81 |
-07:29:22.3 |
HIP 56318 |
35.12 |
| 2026-03-31 00:00 |
11:30:46.44 |
-07:28:55.1 |
HIP 56318 |
36.47 |
| 2026-03-31 12:00 |
11:30:41.10 |
-07:28:27.7 |
HIP 56157 |
37.29 |
| 2026-04-01 00:00 |
11:30:35.77 |
-07:28:00.4 |
HIP 55969 |
37.55 |
| 2026-04-01 12:00 |
11:30:30.46 |
-07:27:33.0 |
HIP 55969 |
36.16 |
| 2026-04-02 00:00 |
11:30:25.17 |
-07:27:05.6 |
HIP 55969 |
34.77 |
| 2026-04-02 12:00 |
11:30:19.89 |
-07:26:38.2 |
HIP 55969 |
33.39 |
| 2026-04-03 00:00 |
11:30:14.64 |
-07:26:10.8 |
HIP 55969 |
32.01 |
| 2026-04-03 12:00 |
11:30:09.40 |
-07:25:43.3 |
HIP 55969 |
30.64 |
| 2026-04-04 00:00 |
11:30:04.19 |
-07:25:15.9 |
HIP 55969 |
29.28 |
| 2026-04-04 12:00 |
11:29:59.00 |
-07:24:48.4 |
HIP 55969 |
27.91 |
| 2026-04-05 00:00 |
11:29:53.82 |
-07:24:20.9 |
HIP 55969 |
26.56 |
| 2026-04-05 12:00 |
11:29:48.67 |
-07:23:53.4 |
HIP 55969 |
25.21 |
| 2026-04-06 00:00 |
11:29:43.54 |
-07:23:25.9 |
HIP 55969 |
23.87 |
| 2026-04-06 12:00 |
11:29:38.43 |
-07:22:58.4 |
HIP 55969 |
22.53 |
| 2026-04-07 00:00 |
11:29:33.35 |
-07:22:30.9 |
HIP 55969 |
21.20 |
| 2026-04-07 12:00 |
11:29:28.28 |
-07:22:03.4 |
HIP 55969 |
19.87 |
| 2026-04-08 00:00 |
11:29:23.24 |
-07:21:36.0 |
HIP 55969 |
18.56 |
| 2026-04-08 12:00 |
11:29:18.23 |
-07:21:08.5 |
HIP 55969 |
17.25 |
| 2026-04-09 00:00 |
11:29:13.23 |
-07:20:41.1 |
HIP 55969 |
15.95 |
| 2026-04-09 12:00 |
11:29:08.26 |
-07:20:13.6 |
HIP 55969 |
14.66 |
| 2026-04-10 00:00 |
11:29:03.32 |
-07:19:46.2 |
HIP 55969 |
13.37 |
| 2026-04-10 12:00 |
11:28:58.40 |
-07:19:18.9 |
HIP 55969 |
12.11 |
| 2026-04-11 00:00 |
11:28:53.51 |
-07:18:51.5 |
HIP 55969 |
10.85 |
| 2026-04-11 12:00 |
11:28:48.64 |
-07:18:24.2 |
HIP 55969 |
9.62 |
| 2026-04-12 00:00 |
11:28:43.80 |
-07:17:56.9 |
HIP 55969 |
8.40 |
| 2026-04-12 12:00 |
11:28:38.99 |
-07:17:29.7 |
HIP 55969 |
7.22 |
| 2026-04-13 00:00 |
11:28:34.20 |
-07:17:02.5 |
HIP 55969 |
6.08 |
| 2026-04-13 12:00 |
11:28:29.44 |
-07:16:35.3 |
HIP 55969 |
5.01 |
| 2026-04-14 00:00 |
11:28:24.71 |
-07:16:08.2 |
HIP 55969 |
4.07 |
| 2026-04-14 12:00 |
11:28:20.01 |
-07:15:41.2 |
HIP 55969 |
3.33 |
| 2026-04-15 00:00 |
11:28:15.33 |
-07:15:14.2 |
HIP 55969 |
2.98 |
| 2026-04-15 12:00 |
11:28:10.69 |
-07:14:47.2 |
HIP 55969 |
3.11 |
| 2026-04-16 00:00 |
11:28:06.07 |
-07:14:20.4 |
HIP 55969 |
3.68 |