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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
22:51:26.60 |
+54:05:53.6 |
HIP 112829 |
4.82 |
| 2026-06-03 00:00 |
22:51:24.35 |
+54:07:36.8 |
HIP 112829 |
3.80 |
| 2026-06-03 12:00 |
22:51:21.98 |
+54:09:20.0 |
HIP 112829 |
3.42 |
| 2026-06-04 00:00 |
22:51:19.50 |
+54:11:02.9 |
HIP 112829 |
3.88 |
| 2026-06-04 12:00 |
22:51:16.91 |
+54:12:45.7 |
HIP 112829 |
4.94 |
| 2026-06-05 00:00 |
22:51:14.20 |
+54:14:28.2 |
HIP 112829 |
6.31 |
| 2026-06-05 12:00 |
22:51:11.39 |
+54:16:10.6 |
HIP 112829 |
7.83 |
| 2026-06-06 00:00 |
22:51:08.46 |
+54:17:52.7 |
HIP 112829 |
9.42 |
| 2026-06-06 12:00 |
22:51:05.42 |
+54:19:34.6 |
HIP 112829 |
11.06 |
| 2026-06-07 00:00 |
22:51:02.27 |
+54:21:16.3 |
HIP 112829 |
12.72 |
| 2026-06-07 12:00 |
22:50:59.00 |
+54:22:57.8 |
HIP 112829 |
14.41 |
| 2026-06-08 00:00 |
22:50:55.62 |
+54:24:39.0 |
HIP 112829 |
16.10 |
| 2026-06-08 12:00 |
22:50:52.13 |
+54:26:20.0 |
HIP 112829 |
17.81 |
| 2026-06-09 00:00 |
22:50:48.52 |
+54:28:00.7 |
HIP 112641 |
17.81 |
| 2026-06-09 12:00 |
22:50:44.80 |
+54:29:41.2 |
HIP 112641 |
17.65 |
| 2026-06-10 00:00 |
22:50:40.96 |
+54:31:21.4 |
HIP 112641 |
17.65 |
| 2026-06-10 12:00 |
22:50:37.01 |
+54:33:01.3 |
HIP 112641 |
17.81 |
| 2026-06-11 00:00 |
22:50:32.95 |
+54:34:40.9 |
HIP 112734 |
17.41 |
| 2026-06-11 12:00 |
22:50:28.77 |
+54:36:20.2 |
HIP 112734 |
15.64 |
| 2026-06-12 00:00 |
22:50:24.48 |
+54:37:59.2 |
HIP 112734 |
13.88 |
| 2026-06-12 12:00 |
22:50:20.07 |
+54:39:37.9 |
HIP 112734 |
12.12 |
| 2026-06-13 00:00 |
22:50:15.54 |
+54:41:16.3 |
HIP 112734 |
10.35 |
| 2026-06-13 12:00 |
22:50:10.90 |
+54:42:54.4 |
HIP 112734 |
8.59 |
| 2026-06-14 00:00 |
22:50:06.14 |
+54:44:32.1 |
HIP 112734 |
6.82 |
| 2026-06-14 12:00 |
22:50:01.27 |
+54:46:09.5 |
HIP 112734 |
5.05 |
| 2026-06-15 00:00 |
22:49:56.29 |
+54:47:46.5 |
HIP 112734 |
3.28 |
| 2026-06-15 12:00 |
22:49:51.18 |
+54:49:23.2 |
HIP 112734 |
1.51 |
| 2026-06-16 00:00 |
22:49:45.96 |
+54:50:59.5 |
HIP 112734 |
0.30 |
| 2026-06-16 12:00 |
22:49:40.63 |
+54:52:35.4 |
HIP 112734 |
2.04 |
| 2026-06-17 00:00 |
22:49:35.18 |
+54:54:10.9 |
HIP 112734 |
3.82 |
| 2026-06-17 12:00 |
22:49:29.61 |
+54:55:46.0 |
HIP 112734 |
5.59 |
| 2026-06-18 00:00 |
22:49:23.93 |
+54:57:20.7 |
HIP 112734 |
7.37 |
| 2026-06-18 12:00 |
22:49:18.13 |
+54:58:55.0 |
HIP 112734 |
9.15 |
| 2026-06-19 00:00 |
22:49:12.22 |
+55:00:28.9 |
HIP 112632 |
8.20 |
| 2026-06-19 12:00 |
22:49:06.19 |
+55:02:02.4 |
HIP 112632 |
6.42 |
| 2026-06-20 00:00 |
22:49:00.05 |
+55:03:35.4 |
HIP 112632 |
4.64 |
| 2026-06-20 12:00 |
22:48:53.79 |
+55:05:08.0 |
HIP 112632 |
2.86 |
| 2026-06-21 00:00 |
22:48:47.41 |
+55:06:40.1 |
HIP 112632 |
1.07 |
| 2026-06-21 12:00 |
22:48:40.93 |
+55:08:11.8 |
HIP 112632 |
0.72 |
| 2026-06-22 00:00 |
22:48:34.32 |
+55:09:43.0 |
HIP 112632 |
2.50 |