メタデータ
| 項目 |
値 |
| Designation |
C/2016 C2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-04-19T14:19:31.131840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:23Z |
| Obs used |
148 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
20.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-03-12.0000000 |
| e |
0.97563583 |
| q (au) |
1.559754 |
| a (au) |
64.018322 |
| i (deg) |
38.156610 |
| Ω (om, deg) |
24.404634 |
| ω (w, deg) |
214.403353 |
| M (ma, deg) |
359.925732 |
等級
散乱 + 全体線形
$$
M_a = (14.251 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.251 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
01:52:29.68 |
+16:20:09.1 |
HIP 8667 |
12.90 |
| 2026-06-01 12:00 |
01:52:33.41 |
+16:20:36.6 |
HIP 8667 |
13.64 |
| 2026-06-02 00:00 |
01:52:37.13 |
+16:21:03.9 |
HIP 8667 |
14.41 |
| 2026-06-02 12:00 |
01:52:40.81 |
+16:21:31.2 |
HIP 8667 |
15.20 |
| 2026-06-03 00:00 |
01:52:44.48 |
+16:21:58.3 |
HIP 8667 |
16.01 |
| 2026-06-03 12:00 |
01:52:48.12 |
+16:22:25.4 |
HIP 8667 |
16.83 |
| 2026-06-04 00:00 |
01:52:51.73 |
+16:22:52.4 |
HIP 8667 |
17.66 |
| 2026-06-04 12:00 |
01:52:55.32 |
+16:23:19.2 |
HIP 8667 |
18.50 |
| 2026-06-05 00:00 |
01:52:58.88 |
+16:23:46.0 |
HIP 8667 |
19.34 |
| 2026-06-05 12:00 |
01:53:02.42 |
+16:24:12.6 |
HIP 8667 |
20.19 |
| 2026-06-06 00:00 |
01:53:05.93 |
+16:24:39.2 |
HIP 8667 |
21.04 |
| 2026-06-06 12:00 |
01:53:09.42 |
+16:25:05.6 |
HIP 8667 |
21.90 |
| 2026-06-07 00:00 |
01:53:12.88 |
+16:25:31.9 |
HIP 8667 |
22.75 |
| 2026-06-07 12:00 |
01:53:16.31 |
+16:25:58.2 |
HIP 8667 |
23.61 |
| 2026-06-08 00:00 |
01:53:19.71 |
+16:26:24.3 |
HIP 8667 |
24.46 |
| 2026-06-08 12:00 |
01:53:23.09 |
+16:26:50.3 |
HIP 8667 |
25.31 |
| 2026-06-09 00:00 |
01:53:26.44 |
+16:27:16.2 |
HIP 8667 |
26.16 |
| 2026-06-09 12:00 |
01:53:29.77 |
+16:27:41.9 |
HIP 8667 |
27.01 |
| 2026-06-10 00:00 |
01:53:33.06 |
+16:28:07.6 |
HIP 8667 |
27.85 |
| 2026-06-10 12:00 |
01:53:36.33 |
+16:28:33.1 |
HIP 8667 |
28.69 |
| 2026-06-11 00:00 |
01:53:39.57 |
+16:28:58.5 |
HIP 8667 |
29.53 |
| 2026-06-11 12:00 |
01:53:42.78 |
+16:29:23.8 |
HIP 8667 |
30.36 |
| 2026-06-12 00:00 |
01:53:45.96 |
+16:29:49.0 |
HIP 8667 |
31.18 |
| 2026-06-12 12:00 |
01:53:49.11 |
+16:30:14.0 |
HIP 8667 |
32.00 |
| 2026-06-13 00:00 |
01:53:52.24 |
+16:30:39.0 |
HIP 8667 |
32.82 |
| 2026-06-13 12:00 |
01:53:55.33 |
+16:31:03.7 |
HIP 8667 |
33.63 |
| 2026-06-14 00:00 |
01:53:58.40 |
+16:31:28.4 |
HIP 8816 |
33.80 |
| 2026-06-14 12:00 |
01:54:01.43 |
+16:31:53.0 |
HIP 8816 |
33.61 |
| 2026-06-15 00:00 |
01:54:04.44 |
+16:32:17.4 |
HIP 8816 |
33.44 |
| 2026-06-15 12:00 |
01:54:07.41 |
+16:32:41.6 |
HIP 8816 |
33.30 |
| 2026-06-16 00:00 |
01:54:10.35 |
+16:33:05.8 |
HIP 8816 |
33.17 |
| 2026-06-16 12:00 |
01:54:13.26 |
+16:33:29.8 |
HIP 8816 |
33.06 |
| 2026-06-17 00:00 |
01:54:16.15 |
+16:33:53.6 |
HIP 8816 |
32.96 |
| 2026-06-17 12:00 |
01:54:19.00 |
+16:34:17.4 |
HIP 8816 |
32.89 |
| 2026-06-18 00:00 |
01:54:21.81 |
+16:34:41.0 |
HIP 8816 |
32.83 |
| 2026-06-18 12:00 |
01:54:24.60 |
+16:35:04.4 |
HIP 8816 |
32.79 |
| 2026-06-19 00:00 |
01:54:27.36 |
+16:35:27.7 |
HIP 8816 |
32.77 |
| 2026-06-19 12:00 |
01:54:30.08 |
+16:35:50.9 |
HIP 8816 |
32.76 |
| 2026-06-20 00:00 |
01:54:32.77 |
+16:36:13.9 |
HIP 8816 |
32.76 |
| 2026-06-20 12:00 |
01:54:35.43 |
+16:36:36.8 |
HIP 8816 |
32.79 |
| 2026-06-21 00:00 |
01:54:38.05 |
+16:36:59.5 |
HIP 8816 |
32.82 |
| 2026-06-21 12:00 |
01:54:40.65 |
+16:37:22.1 |
HIP 8816 |
32.87 |
| 2026-06-22 00:00 |
01:54:43.21 |
+16:37:44.5 |
HIP 8816 |
32.94 |