メタデータ
| 項目 |
値 |
| Designation |
C/2014 C3 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-01-16T17:29:08.499840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:49Z |
| Obs used |
601 |
| NEO |
- |
| M1 |
15.000 |
| 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) |
2014-03-28.0000000 |
| e |
0.98282842 |
| q (au) |
1.862025 |
| a (au) |
108.436469 |
| i (deg) |
151.784310 |
| Ω (om, deg) |
204.406943 |
| ω (w, deg) |
345.876795 |
| M (ma, deg) |
0.061337 |
等級
散乱 + 全体線形
$$
M_a = (14.486 + 3.306\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.486 |
| n |
3.306 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.033 |
| 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 |
03:48:53.43 |
+38:21:08.5 |
HIP 17930 |
31.83 |
| 2026-06-01 12:00 |
03:48:58.14 |
+38:21:22.1 |
HIP 17930 |
31.65 |
| 2026-06-02 00:00 |
03:49:02.84 |
+38:21:35.7 |
HIP 17930 |
31.50 |
| 2026-06-02 12:00 |
03:49:07.54 |
+38:21:49.6 |
HIP 17930 |
31.37 |
| 2026-06-03 00:00 |
03:49:12.22 |
+38:22:03.5 |
HIP 17930 |
31.28 |
| 2026-06-03 12:00 |
03:49:16.90 |
+38:22:17.5 |
HIP 17930 |
31.22 |
| 2026-06-04 00:00 |
03:49:21.56 |
+38:22:31.7 |
HIP 17930 |
31.19 |
| 2026-06-04 12:00 |
03:49:26.22 |
+38:22:46.0 |
HIP 17930 |
31.20 |
| 2026-06-05 00:00 |
03:49:30.86 |
+38:23:00.4 |
HIP 17930 |
31.23 |
| 2026-06-05 12:00 |
03:49:35.50 |
+38:23:15.0 |
HIP 17930 |
31.29 |
| 2026-06-06 00:00 |
03:49:40.12 |
+38:23:29.6 |
HIP 17930 |
31.39 |
| 2026-06-06 12:00 |
03:49:44.74 |
+38:23:44.4 |
HIP 17930 |
31.51 |
| 2026-06-07 00:00 |
03:49:49.34 |
+38:23:59.3 |
HIP 17930 |
31.67 |
| 2026-06-07 12:00 |
03:49:53.93 |
+38:24:14.3 |
HIP 17930 |
31.85 |
| 2026-06-08 00:00 |
03:49:58.51 |
+38:24:29.4 |
HIP 17930 |
32.07 |
| 2026-06-08 12:00 |
03:50:03.08 |
+38:24:44.7 |
HIP 17930 |
32.30 |
| 2026-06-09 00:00 |
03:50:07.63 |
+38:25:00.0 |
HIP 17930 |
32.57 |
| 2026-06-09 12:00 |
03:50:12.17 |
+38:25:15.5 |
HIP 17930 |
32.86 |
| 2026-06-10 00:00 |
03:50:16.70 |
+38:25:31.1 |
HIP 17930 |
33.18 |
| 2026-06-10 12:00 |
03:50:21.22 |
+38:25:46.8 |
HIP 17930 |
33.52 |
| 2026-06-11 00:00 |
03:50:25.72 |
+38:26:02.6 |
HIP 17930 |
33.89 |
| 2026-06-11 12:00 |
03:50:30.21 |
+38:26:18.5 |
HIP 17890 |
34.27 |
| 2026-06-12 00:00 |
03:50:34.68 |
+38:26:34.5 |
HIP 17890 |
34.30 |
| 2026-06-12 12:00 |
03:50:39.14 |
+38:26:50.6 |
HIP 17890 |
34.34 |
| 2026-06-13 00:00 |
03:50:43.58 |
+38:27:06.8 |
HIP 17890 |
34.41 |
| 2026-06-13 12:00 |
03:50:48.01 |
+38:27:23.2 |
HIP 17890 |
34.50 |
| 2026-06-14 00:00 |
03:50:52.43 |
+38:27:39.6 |
HIP 17890 |
34.61 |
| 2026-06-14 12:00 |
03:50:56.82 |
+38:27:56.1 |
HIP 17890 |
34.74 |
| 2026-06-15 00:00 |
03:51:01.20 |
+38:28:12.8 |
HIP 17890 |
34.89 |
| 2026-06-15 12:00 |
03:51:05.57 |
+38:28:29.5 |
HIP 17890 |
35.06 |
| 2026-06-16 00:00 |
03:51:09.91 |
+38:28:46.3 |
HIP 18238 |
34.31 |
| 2026-06-16 12:00 |
03:51:14.24 |
+38:29:03.3 |
HIP 18238 |
33.44 |
| 2026-06-17 00:00 |
03:51:18.55 |
+38:29:20.3 |
HIP 18238 |
32.57 |
| 2026-06-17 12:00 |
03:51:22.85 |
+38:29:37.4 |
HIP 18238 |
31.70 |
| 2026-06-18 00:00 |
03:51:27.12 |
+38:29:54.6 |
HIP 18238 |
30.84 |
| 2026-06-18 12:00 |
03:51:31.38 |
+38:30:11.9 |
HIP 18238 |
29.98 |
| 2026-06-19 00:00 |
03:51:35.62 |
+38:30:29.3 |
HIP 18238 |
29.13 |
| 2026-06-19 12:00 |
03:51:39.83 |
+38:30:46.8 |
HIP 18238 |
28.29 |
| 2026-06-20 00:00 |
03:51:44.03 |
+38:31:04.3 |
HIP 18238 |
27.45 |
| 2026-06-20 12:00 |
03:51:48.21 |
+38:31:22.0 |
HIP 18238 |
26.61 |
| 2026-06-21 00:00 |
03:51:52.37 |
+38:31:39.7 |
HIP 18238 |
25.78 |
| 2026-06-21 12:00 |
03:51:56.51 |
+38:31:57.5 |
HIP 18238 |
24.96 |
| 2026-06-22 00:00 |
03:52:00.63 |
+38:32:15.4 |
HIP 18238 |
24.15 |