C/2021 B3 (NEOWISE)
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) |
| 2026-02-03 00:00 |
22:25:08.83 |
+49:48:17.1 |
HIP 110609 |
20.63 |
| 2026-02-03 12:00 |
22:25:18.63 |
+49:47:57.8 |
HIP 110609 |
20.86 |
| 2026-02-04 00:00 |
22:25:28.46 |
+49:47:39.4 |
HIP 110609 |
21.22 |
| 2026-02-04 12:00 |
22:25:38.31 |
+49:47:21.9 |
HIP 110609 |
21.72 |
| 2026-02-05 00:00 |
22:25:48.19 |
+49:47:05.4 |
HIP 110609 |
22.33 |
| 2026-02-05 12:00 |
22:25:58.09 |
+49:46:49.9 |
HIP 110609 |
23.06 |
| 2026-02-06 00:00 |
22:26:08.01 |
+49:46:35.3 |
HIP 110609 |
23.90 |
| 2026-02-06 12:00 |
22:26:17.96 |
+49:46:21.6 |
HIP 110609 |
24.82 |
| 2026-02-07 00:00 |
22:26:27.93 |
+49:46:08.9 |
HIP 110609 |
25.83 |
| 2026-02-07 12:00 |
22:26:37.92 |
+49:45:57.2 |
HIP 110609 |
26.91 |
| 2026-02-08 00:00 |
22:26:47.92 |
+49:45:46.3 |
HIP 110609 |
28.06 |
| 2026-02-08 12:00 |
22:26:57.95 |
+49:45:36.5 |
HIP 110948 |
28.53 |
| 2026-02-09 00:00 |
22:27:08.00 |
+49:45:27.5 |
HIP 110948 |
27.70 |
| 2026-02-09 12:00 |
22:27:18.07 |
+49:45:19.5 |
HIP 110981 |
26.51 |
| 2026-02-10 00:00 |
22:27:28.15 |
+49:45:12.5 |
HIP 110981 |
25.37 |
| 2026-02-10 12:00 |
22:27:38.25 |
+49:45:06.4 |
HIP 110981 |
24.30 |
| 2026-02-11 00:00 |
22:27:48.37 |
+49:45:01.2 |
HIP 110981 |
23.31 |
| 2026-02-11 12:00 |
22:27:58.50 |
+49:44:56.9 |
HIP 110981 |
22.40 |
| 2026-02-12 00:00 |
22:28:08.64 |
+49:44:53.6 |
HIP 110981 |
21.60 |
| 2026-02-12 12:00 |
22:28:18.80 |
+49:44:51.3 |
HIP 110981 |
20.91 |
| 2026-02-13 00:00 |
22:28:28.98 |
+49:44:49.8 |
HIP 110981 |
20.34 |
| 2026-02-13 12:00 |
22:28:39.16 |
+49:44:49.3 |
HIP 110981 |
19.91 |
| 2026-02-14 00:00 |
22:28:49.36 |
+49:44:49.8 |
HIP 110981 |
19.62 |
| 2026-02-14 12:00 |
22:28:59.57 |
+49:44:51.1 |
HIP 110981 |
19.49 |
| 2026-02-15 00:00 |
22:29:09.78 |
+49:44:53.4 |
HIP 110981 |
19.51 |
| 2026-02-15 12:00 |
22:29:20.01 |
+49:44:56.6 |
HIP 110981 |
19.68 |
| 2026-02-16 00:00 |
22:29:30.25 |
+49:45:00.8 |
HIP 111178 |
19.91 |
| 2026-02-16 12:00 |
22:29:40.49 |
+49:45:05.8 |
HIP 111178 |
18.39 |
| 2026-02-17 00:00 |
22:29:50.74 |
+49:45:11.8 |
HIP 111178 |
16.87 |
| 2026-02-17 12:00 |
22:30:01.00 |
+49:45:18.7 |
HIP 111178 |
15.38 |
| 2026-02-18 00:00 |
22:30:11.26 |
+49:45:26.5 |
HIP 111178 |
13.92 |
| 2026-02-18 12:00 |
22:30:21.53 |
+49:45:35.2 |
HIP 111178 |
12.50 |
| 2026-02-19 00:00 |
22:30:31.80 |
+49:45:44.8 |
HIP 111178 |
11.13 |
| 2026-02-19 12:00 |
22:30:42.08 |
+49:45:55.4 |
HIP 111178 |
9.84 |
| 2026-02-20 00:00 |
22:30:52.35 |
+49:46:06.8 |
HIP 111178 |
8.67 |
| 2026-02-20 12:00 |
22:31:02.63 |
+49:46:19.2 |
HIP 111178 |
7.68 |
| 2026-02-21 00:00 |
22:31:12.91 |
+49:46:32.4 |
HIP 111178 |
6.93 |
| 2026-02-21 12:00 |
22:31:23.19 |
+49:46:46.6 |
HIP 111209 |
6.03 |
| 2026-02-22 00:00 |
22:31:33.48 |
+49:47:01.6 |
HIP 111209 |
5.33 |
| 2026-02-22 12:00 |
22:31:43.75 |
+49:47:17.5 |
HIP 111209 |
5.12 |
| 2026-02-23 00:00 |
22:31:54.03 |
+49:47:34.3 |
HIP 111209 |
5.47 |
| 2026-02-23 12:00 |
22:32:04.31 |
+49:47:52.0 |
HIP 111209 |
6.28 |
| 2026-02-24 00:00 |
22:32:14.58 |
+49:48:10.6 |
HIP 111209 |
7.40 |