メタデータ
| 項目 |
値 |
| Designation |
C/2016 B1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-12-04T17:12:22.285440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:22Z |
| Obs used |
522 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
8.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-03-28.0000000 |
| e |
0.99239477 |
| q (au) |
3.206199 |
| a (au) |
421.578150 |
| i (deg) |
50.476159 |
| Ω (om, deg) |
231.954169 |
| ω (w, deg) |
8.559465 |
| M (ma, deg) |
0.012899 |
等級
散乱 + 全体線形
$$
M_a = (8.995 + 3.769\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.995 |
| n |
3.769 |
| gf |
1.000 |
| gb |
-0.935 |
| 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) |
| 2026-09-20 00:00 |
01:03:50.55 |
+36:26:14.2 |
HIP 4994 |
23.84 |
| 2026-09-20 12:00 |
01:03:45.43 |
+36:25:58.6 |
HIP 4994 |
24.20 |
| 2026-09-21 00:00 |
01:03:40.28 |
+36:25:42.7 |
HIP 4994 |
24.61 |
| 2026-09-21 12:00 |
01:03:35.12 |
+36:25:26.3 |
HIP 4994 |
25.07 |
| 2026-09-22 00:00 |
01:03:29.94 |
+36:25:09.5 |
HIP 4950 |
25.36 |
| 2026-09-22 12:00 |
01:03:24.75 |
+36:24:52.3 |
HIP 4950 |
25.66 |
| 2026-09-23 00:00 |
01:03:19.54 |
+36:24:34.6 |
HIP 4950 |
26.01 |
| 2026-09-23 12:00 |
01:03:14.31 |
+36:24:16.6 |
HIP 4950 |
26.41 |
| 2026-09-24 00:00 |
01:03:09.07 |
+36:23:58.2 |
HIP 4950 |
26.85 |
| 2026-09-24 12:00 |
01:03:03.81 |
+36:23:39.3 |
HIP 4950 |
27.34 |
| 2026-09-25 00:00 |
01:02:58.54 |
+36:23:20.1 |
HIP 4950 |
27.87 |
| 2026-09-25 12:00 |
01:02:53.26 |
+36:23:00.4 |
HIP 4797 |
28.16 |
| 2026-09-26 00:00 |
01:02:47.96 |
+36:22:40.4 |
HIP 4797 |
27.29 |
| 2026-09-26 12:00 |
01:02:42.65 |
+36:22:19.9 |
HIP 4797 |
26.44 |
| 2026-09-27 00:00 |
01:02:37.33 |
+36:21:59.1 |
HIP 4797 |
25.59 |
| 2026-09-27 12:00 |
01:02:32.00 |
+36:21:37.8 |
HIP 4797 |
24.77 |
| 2026-09-28 00:00 |
01:02:26.65 |
+36:21:16.1 |
HIP 4797 |
23.96 |
| 2026-09-28 12:00 |
01:02:21.29 |
+36:20:54.1 |
HIP 4797 |
23.17 |
| 2026-09-29 00:00 |
01:02:15.93 |
+36:20:31.6 |
HIP 4797 |
22.40 |
| 2026-09-29 12:00 |
01:02:10.55 |
+36:20:08.8 |
HIP 4797 |
21.66 |
| 2026-09-30 00:00 |
01:02:05.16 |
+36:19:45.5 |
HIP 4797 |
20.95 |
| 2026-09-30 12:00 |
01:01:59.77 |
+36:19:21.9 |
HIP 4797 |
20.28 |
| 2026-10-01 00:00 |
01:01:54.36 |
+36:18:57.8 |
HIP 4797 |
19.64 |
| 2026-10-01 12:00 |
01:01:48.95 |
+36:18:33.4 |
HIP 4797 |
19.05 |
| 2026-10-02 00:00 |
01:01:43.53 |
+36:18:08.6 |
HIP 4797 |
18.50 |
| 2026-10-02 12:00 |
01:01:38.10 |
+36:17:43.4 |
HIP 4797 |
18.01 |
| 2026-10-03 00:00 |
01:01:32.67 |
+36:17:17.8 |
HIP 4797 |
17.58 |
| 2026-10-03 12:00 |
01:01:27.23 |
+36:16:51.8 |
HIP 4797 |
17.21 |
| 2026-10-04 00:00 |
01:01:21.79 |
+36:16:25.4 |
HIP 4797 |
16.90 |
| 2026-10-04 12:00 |
01:01:16.34 |
+36:15:58.7 |
HIP 4797 |
16.67 |
| 2026-10-05 00:00 |
01:01:10.88 |
+36:15:31.6 |
HIP 4797 |
16.52 |
| 2026-10-05 12:00 |
01:01:05.42 |
+36:15:04.0 |
HIP 4797 |
16.45 |
| 2026-10-06 00:00 |
01:00:59.96 |
+36:14:36.1 |
HIP 4797 |
16.45 |
| 2026-10-06 12:00 |
01:00:54.50 |
+36:14:07.9 |
HIP 4797 |
16.54 |
| 2026-10-07 00:00 |
01:00:49.03 |
+36:13:39.2 |
HIP 4797 |
16.71 |
| 2026-10-07 12:00 |
01:00:43.56 |
+36:13:10.2 |
HIP 4797 |
16.96 |
| 2026-10-08 00:00 |
01:00:38.09 |
+36:12:40.8 |
HIP 4797 |
17.29 |
| 2026-10-08 12:00 |
01:00:32.62 |
+36:12:11.1 |
HIP 4797 |
17.68 |
| 2026-10-09 00:00 |
01:00:27.15 |
+36:11:40.9 |
HIP 4797 |
18.15 |
| 2026-10-09 12:00 |
01:00:21.68 |
+36:11:10.4 |
HIP 4797 |
18.68 |
| 2026-10-10 00:00 |
01:00:16.21 |
+36:10:39.6 |
HIP 4797 |
19.27 |
| 2026-10-10 12:00 |
01:00:10.74 |
+36:10:08.4 |
HIP 4797 |
19.91 |
| 2026-10-11 00:00 |
01:00:05.28 |
+36:09:36.8 |
HIP 4797 |
20.61 |