メタデータ
| 項目 |
値 |
| Designation |
C/2021 B3 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-03-10T21:53:20.584320Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:56Z |
| Obs used |
84 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-22T05:58:17.184000Z |
| Discovery magnitude (MPC) |
19.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-02-16.0000000 |
| e |
0.93819965 |
| q (au) |
2.160159 |
| a (au) |
34.953837 |
| i (deg) |
119.489804 |
| Ω (om, deg) |
67.284845 |
| ω (w, deg) |
293.559147 |
| M (ma, deg) |
359.890724 |
等級
散乱 + 全体線形
$$
M_a = (11.234 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.234 |
| 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) |
| 2026-05-12 00:00 |
22:51:22.74 |
+52:50:45.7 |
HIP 112896 |
11.45 |
| 2026-05-12 12:00 |
22:51:24.97 |
+52:52:29.9 |
HIP 112896 |
9.70 |
| 2026-05-13 00:00 |
22:51:27.10 |
+52:54:14.2 |
HIP 112896 |
7.95 |
| 2026-05-13 12:00 |
22:51:29.14 |
+52:55:58.6 |
HIP 112896 |
6.21 |
| 2026-05-14 00:00 |
22:51:31.08 |
+52:57:43.1 |
HIP 112896 |
4.51 |
| 2026-05-14 12:00 |
22:51:32.92 |
+52:59:27.8 |
HIP 112896 |
2.89 |
| 2026-05-15 00:00 |
22:51:34.66 |
+53:01:12.5 |
HIP 112896 |
1.64 |
| 2026-05-15 12:00 |
22:51:36.31 |
+53:02:57.4 |
HIP 112896 |
1.81 |
| 2026-05-16 00:00 |
22:51:37.85 |
+53:04:42.3 |
HIP 112896 |
3.18 |
| 2026-05-16 12:00 |
22:51:39.30 |
+53:06:27.3 |
HIP 112896 |
4.82 |
| 2026-05-17 00:00 |
22:51:40.65 |
+53:08:12.4 |
HIP 112904 |
3.48 |
| 2026-05-17 12:00 |
22:51:41.89 |
+53:09:57.5 |
HIP 112904 |
1.81 |
| 2026-05-18 00:00 |
22:51:43.04 |
+53:11:42.8 |
HIP 112904 |
0.82 |
| 2026-05-18 12:00 |
22:51:44.08 |
+53:13:28.0 |
HIP 112904 |
2.08 |
| 2026-05-19 00:00 |
22:51:45.02 |
+53:15:13.3 |
HIP 112904 |
3.77 |
| 2026-05-19 12:00 |
22:51:45.86 |
+53:16:58.7 |
HIP 112904 |
5.50 |
| 2026-05-20 00:00 |
22:51:46.60 |
+53:18:44.0 |
HIP 112904 |
7.25 |
| 2026-05-20 12:00 |
22:51:47.23 |
+53:20:29.4 |
HIP 112904 |
9.00 |
| 2026-05-21 00:00 |
22:51:47.76 |
+53:22:14.8 |
HIP 112904 |
10.76 |
| 2026-05-21 12:00 |
22:51:48.19 |
+53:24:00.2 |
HIP 112904 |
12.52 |
| 2026-05-22 00:00 |
22:51:48.51 |
+53:25:45.6 |
HIP 112904 |
14.27 |
| 2026-05-22 12:00 |
22:51:48.73 |
+53:27:31.0 |
HIP 112912 |
15.14 |
| 2026-05-23 00:00 |
22:51:48.85 |
+53:29:16.4 |
HIP 112912 |
13.39 |
| 2026-05-23 12:00 |
22:51:48.86 |
+53:31:01.8 |
HIP 112912 |
11.64 |
| 2026-05-24 00:00 |
22:51:48.76 |
+53:32:47.1 |
HIP 112912 |
9.90 |
| 2026-05-24 12:00 |
22:51:48.56 |
+53:34:32.4 |
HIP 112912 |
8.18 |
| 2026-05-25 00:00 |
22:51:48.26 |
+53:36:17.6 |
HIP 112912 |
6.47 |
| 2026-05-25 12:00 |
22:51:47.85 |
+53:38:02.8 |
HIP 112912 |
4.80 |
| 2026-05-26 00:00 |
22:51:47.33 |
+53:39:48.0 |
HIP 112912 |
3.22 |
| 2026-05-26 12:00 |
22:51:46.70 |
+53:41:33.0 |
HIP 112912 |
2.00 |
| 2026-05-27 00:00 |
22:51:45.97 |
+53:43:18.0 |
HIP 112912 |
1.95 |
| 2026-05-27 12:00 |
22:51:45.13 |
+53:45:03.0 |
HIP 112912 |
3.14 |
| 2026-05-28 00:00 |
22:51:44.19 |
+53:46:47.8 |
HIP 112912 |
4.70 |
| 2026-05-28 12:00 |
22:51:43.13 |
+53:48:32.6 |
HIP 112912 |
6.36 |
| 2026-05-29 00:00 |
22:51:41.97 |
+53:50:17.2 |
HIP 112846 |
6.77 |
| 2026-05-29 12:00 |
22:51:40.70 |
+53:52:01.8 |
HIP 112846 |
5.48 |
| 2026-05-30 00:00 |
22:51:39.32 |
+53:53:46.2 |
HIP 112846 |
4.50 |
| 2026-05-30 12:00 |
22:51:37.83 |
+53:55:30.5 |
HIP 112846 |
4.06 |
| 2026-05-31 00:00 |
22:51:36.23 |
+53:57:14.7 |
HIP 112846 |
4.33 |
| 2026-05-31 12:00 |
22:51:34.53 |
+53:58:58.8 |
HIP 112846 |
5.20 |
| 2026-06-01 00:00 |
22:51:32.71 |
+54:00:42.7 |
HIP 112846 |
6.43 |
| 2026-06-01 12:00 |
22:51:30.79 |
+54:02:26.5 |
HIP 112829 |
7.67 |
| 2026-06-02 00:00 |
22:51:28.75 |
+54:04:10.1 |
HIP 112829 |
6.16 |