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 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
11:34:09.93 |
-07:51:33.4 |
HIP 56490 |
11.04 |
| 2026-09-20 12:00 |
11:34:14.68 |
-07:52:14.2 |
HIP 56490 |
9.70 |
| 2026-09-21 00:00 |
11:34:19.43 |
-07:52:55.1 |
HIP 56490 |
8.37 |
| 2026-09-21 12:00 |
11:34:24.17 |
-07:53:36.1 |
HIP 56490 |
7.04 |
| 2026-09-22 00:00 |
11:34:28.91 |
-07:54:17.2 |
HIP 56490 |
5.73 |
| 2026-09-22 12:00 |
11:34:33.64 |
-07:54:58.4 |
HIP 56490 |
4.44 |
| 2026-09-23 00:00 |
11:34:38.37 |
-07:55:39.7 |
HIP 56490 |
3.23 |
| 2026-09-23 12:00 |
11:34:43.10 |
-07:56:21.0 |
HIP 56490 |
2.18 |
| 2026-09-24 00:00 |
11:34:47.81 |
-07:57:02.5 |
HIP 56490 |
1.68 |
| 2026-09-24 12:00 |
11:34:52.52 |
-07:57:44.0 |
HIP 56490 |
2.13 |
| 2026-09-25 00:00 |
11:34:57.23 |
-07:58:25.6 |
HIP 56490 |
3.16 |
| 2026-09-25 12:00 |
11:35:01.93 |
-07:59:07.2 |
HIP 56490 |
4.36 |
| 2026-09-26 00:00 |
11:35:06.62 |
-07:59:48.9 |
HIP 56490 |
5.64 |
| 2026-09-26 12:00 |
11:35:11.31 |
-08:00:30.7 |
HIP 56490 |
6.94 |
| 2026-09-27 00:00 |
11:35:15.98 |
-08:01:12.6 |
HIP 56490 |
8.26 |
| 2026-09-27 12:00 |
11:35:20.65 |
-08:01:54.5 |
HIP 56490 |
9.59 |
| 2026-09-28 00:00 |
11:35:25.32 |
-08:02:36.6 |
HIP 56490 |
10.93 |
| 2026-09-28 12:00 |
11:35:29.97 |
-08:03:18.6 |
HIP 56490 |
12.26 |
| 2026-09-29 00:00 |
11:35:34.62 |
-08:04:00.7 |
HIP 56490 |
13.60 |
| 2026-09-29 12:00 |
11:35:39.25 |
-08:04:42.9 |
HIP 56490 |
14.94 |
| 2026-09-30 00:00 |
11:35:43.88 |
-08:05:25.2 |
HIP 56490 |
16.27 |
| 2026-09-30 12:00 |
11:35:48.50 |
-08:06:07.5 |
HIP 56490 |
17.61 |
| 2026-10-01 00:00 |
11:35:53.11 |
-08:06:49.9 |
HIP 56490 |
18.95 |
| 2026-10-01 12:00 |
11:35:57.71 |
-08:07:32.3 |
HIP 56490 |
20.28 |
| 2026-10-02 00:00 |
11:36:02.29 |
-08:08:14.7 |
HIP 56490 |
21.62 |
| 2026-10-02 12:00 |
11:36:06.87 |
-08:08:57.2 |
HIP 56490 |
22.95 |
| 2026-10-03 00:00 |
11:36:11.44 |
-08:09:39.8 |
HIP 56718 |
22.57 |
| 2026-10-03 12:00 |
11:36:15.99 |
-08:10:22.4 |
HIP 56718 |
21.47 |
| 2026-10-04 00:00 |
11:36:20.54 |
-08:11:05.1 |
HIP 56718 |
20.41 |
| 2026-10-04 12:00 |
11:36:25.07 |
-08:11:47.8 |
HIP 56718 |
19.38 |
| 2026-10-05 00:00 |
11:36:29.59 |
-08:12:30.5 |
HIP 56718 |
18.39 |
| 2026-10-05 12:00 |
11:36:34.10 |
-08:13:13.3 |
HIP 56718 |
17.45 |
| 2026-10-06 00:00 |
11:36:38.60 |
-08:13:56.1 |
HIP 56718 |
16.57 |
| 2026-10-06 12:00 |
11:36:43.08 |
-08:14:38.9 |
HIP 56718 |
15.75 |
| 2026-10-07 00:00 |
11:36:47.55 |
-08:15:21.8 |
HIP 56718 |
15.01 |
| 2026-10-07 12:00 |
11:36:52.00 |
-08:16:04.7 |
HIP 56718 |
14.35 |
| 2026-10-08 00:00 |
11:36:56.44 |
-08:16:47.6 |
HIP 56718 |
13.79 |
| 2026-10-08 12:00 |
11:37:00.87 |
-08:17:30.5 |
HIP 56718 |
13.34 |
| 2026-10-09 00:00 |
11:37:05.28 |
-08:18:13.5 |
HIP 56718 |
13.01 |
| 2026-10-09 12:00 |
11:37:09.68 |
-08:18:56.5 |
HIP 56718 |
12.80 |
| 2026-10-10 00:00 |
11:37:14.06 |
-08:19:39.5 |
HIP 56718 |
12.73 |
| 2026-10-10 12:00 |
11:37:18.43 |
-08:20:22.5 |
HIP 56718 |
12.80 |
| 2026-10-11 00:00 |
11:37:22.78 |
-08:21:05.5 |
HIP 56718 |
12.99 |