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) |
| 2026-09-20 00:00 |
03:55:04.79 |
+39:26:43.9 |
HIP 18313 |
24.91 |
| 2026-09-20 12:00 |
03:55:01.98 |
+39:26:54.3 |
HIP 18313 |
24.71 |
| 2026-09-21 00:00 |
03:54:59.12 |
+39:27:04.5 |
HIP 18313 |
24.52 |
| 2026-09-21 12:00 |
03:54:56.22 |
+39:27:14.6 |
HIP 18313 |
24.34 |
| 2026-09-22 00:00 |
03:54:53.28 |
+39:27:24.5 |
HIP 18313 |
24.18 |
| 2026-09-22 12:00 |
03:54:50.29 |
+39:27:34.2 |
HIP 18313 |
24.04 |
| 2026-09-23 00:00 |
03:54:47.27 |
+39:27:43.7 |
HIP 18313 |
23.91 |
| 2026-09-23 12:00 |
03:54:44.20 |
+39:27:53.0 |
HIP 18313 |
23.81 |
| 2026-09-24 00:00 |
03:54:41.09 |
+39:28:02.2 |
HIP 18313 |
23.72 |
| 2026-09-24 12:00 |
03:54:37.94 |
+39:28:11.1 |
HIP 18313 |
23.65 |
| 2026-09-25 00:00 |
03:54:34.75 |
+39:28:19.9 |
HIP 18313 |
23.60 |
| 2026-09-25 12:00 |
03:54:31.51 |
+39:28:28.5 |
HIP 18313 |
23.58 |
| 2026-09-26 00:00 |
03:54:28.24 |
+39:28:36.9 |
HIP 18313 |
23.58 |
| 2026-09-26 12:00 |
03:54:24.92 |
+39:28:45.2 |
HIP 18313 |
23.60 |
| 2026-09-27 00:00 |
03:54:21.57 |
+39:28:53.2 |
HIP 18313 |
23.64 |
| 2026-09-27 12:00 |
03:54:18.17 |
+39:29:01.0 |
HIP 18313 |
23.70 |
| 2026-09-28 00:00 |
03:54:14.74 |
+39:29:08.7 |
HIP 18313 |
23.80 |
| 2026-09-28 12:00 |
03:54:11.26 |
+39:29:16.1 |
HIP 18313 |
23.91 |
| 2026-09-29 00:00 |
03:54:07.74 |
+39:29:23.4 |
HIP 18313 |
24.05 |
| 2026-09-29 12:00 |
03:54:04.19 |
+39:29:30.5 |
HIP 18313 |
24.21 |
| 2026-09-30 00:00 |
03:54:00.59 |
+39:29:37.3 |
HIP 18313 |
24.40 |
| 2026-09-30 12:00 |
03:53:56.95 |
+39:29:44.0 |
HIP 18313 |
24.62 |
| 2026-10-01 00:00 |
03:53:53.28 |
+39:29:50.5 |
HIP 18313 |
24.86 |
| 2026-10-01 12:00 |
03:53:49.57 |
+39:29:56.7 |
HIP 18313 |
25.12 |
| 2026-10-02 00:00 |
03:53:45.81 |
+39:30:02.8 |
HIP 18313 |
25.41 |
| 2026-10-02 12:00 |
03:53:42.02 |
+39:30:08.6 |
HIP 18313 |
25.72 |
| 2026-10-03 00:00 |
03:53:38.19 |
+39:30:14.3 |
HIP 18074 |
25.28 |
| 2026-10-03 12:00 |
03:53:34.33 |
+39:30:19.8 |
HIP 18074 |
24.61 |
| 2026-10-04 00:00 |
03:53:30.42 |
+39:30:25.0 |
HIP 18074 |
23.95 |
| 2026-10-04 12:00 |
03:53:26.48 |
+39:30:30.0 |
HIP 18074 |
23.29 |
| 2026-10-05 00:00 |
03:53:22.50 |
+39:30:34.9 |
HIP 18074 |
22.64 |
| 2026-10-05 12:00 |
03:53:18.48 |
+39:30:39.5 |
HIP 18074 |
21.99 |
| 2026-10-06 00:00 |
03:53:14.43 |
+39:30:43.9 |
HIP 18074 |
21.34 |
| 2026-10-06 12:00 |
03:53:10.34 |
+39:30:48.1 |
HIP 18074 |
20.70 |
| 2026-10-07 00:00 |
03:53:06.21 |
+39:30:52.1 |
HIP 18074 |
20.07 |
| 2026-10-07 12:00 |
03:53:02.05 |
+39:30:55.8 |
HIP 18074 |
19.45 |
| 2026-10-08 00:00 |
03:52:57.85 |
+39:30:59.4 |
HIP 18074 |
18.84 |
| 2026-10-08 12:00 |
03:52:53.61 |
+39:31:02.7 |
HIP 18074 |
18.24 |
| 2026-10-09 00:00 |
03:52:49.34 |
+39:31:05.8 |
HIP 18074 |
17.66 |
| 2026-10-09 12:00 |
03:52:45.03 |
+39:31:08.7 |
HIP 18074 |
17.10 |
| 2026-10-10 00:00 |
03:52:40.69 |
+39:31:11.4 |
HIP 18074 |
16.56 |
| 2026-10-10 12:00 |
03:52:36.32 |
+39:31:13.9 |
HIP 18074 |
16.05 |
| 2026-10-11 00:00 |
03:52:31.91 |
+39:31:16.1 |
HIP 18074 |
15.56 |