メタデータ
| 項目 |
値 |
| Designation |
C/2022 B4 |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-01-29T21:29:47.313600Z |
| Orbit solution date (soln_date, UTC) |
2022-04-14T14:49:33Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
21.700 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-01-29T11:09:26.064000Z |
| Discovery magnitude (MPC) |
20.81 G |
| Discovery observatory (MPC) |
V00 · Kitt Peak-Bok |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-02-26.0000000 |
| e |
0.99639588 |
| q (au) |
1.379643 |
| a (au) |
382.796465 |
| i (deg) |
20.043251 |
| Ω (om, deg) |
340.661761 |
| ω (w, deg) |
152.955070 |
| M (ma, deg) |
0.003567 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 5.943\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
5.943 |
| gf |
1.000 |
| gb |
-0.814 |
| k |
0.994 |
| 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) |
| 2026-07-29 00:00 |
18:34:03.87 |
-42:16:03.8 |
HIP 90982 |
6.79 |
| 2026-07-29 12:00 |
18:33:54.91 |
-42:15:45.2 |
HIP 90982 |
5.47 |
| 2026-07-30 00:00 |
18:33:46.01 |
-42:15:26.2 |
HIP 90982 |
4.42 |
| 2026-07-30 12:00 |
18:33:37.17 |
-42:15:06.9 |
HIP 90982 |
3.86 |
| 2026-07-31 00:00 |
18:33:28.39 |
-42:14:47.1 |
HIP 90982 |
3.98 |
| 2026-07-31 12:00 |
18:33:19.67 |
-42:14:27.1 |
HIP 90982 |
4.71 |
| 2026-08-01 00:00 |
18:33:11.02 |
-42:14:06.6 |
HIP 90982 |
5.83 |
| 2026-08-01 12:00 |
18:33:02.42 |
-42:13:45.8 |
HIP 90982 |
7.15 |
| 2026-08-02 00:00 |
18:32:53.89 |
-42:13:24.7 |
HIP 90894 |
7.92 |
| 2026-08-02 12:00 |
18:32:45.42 |
-42:13:03.1 |
HIP 90894 |
7.26 |
| 2026-08-03 00:00 |
18:32:37.02 |
-42:12:41.3 |
HIP 90894 |
6.91 |
| 2026-08-03 12:00 |
18:32:28.68 |
-42:12:19.0 |
HIP 90894 |
6.94 |
| 2026-08-04 00:00 |
18:32:20.41 |
-42:11:56.5 |
HIP 90894 |
7.32 |
| 2026-08-04 12:00 |
18:32:12.20 |
-42:11:33.5 |
HIP 90894 |
8.01 |
| 2026-08-05 00:00 |
18:32:04.06 |
-42:11:10.3 |
HIP 90894 |
8.92 |
| 2026-08-05 12:00 |
18:31:55.99 |
-42:10:46.7 |
HIP 90894 |
9.98 |
| 2026-08-06 00:00 |
18:31:47.99 |
-42:10:22.7 |
HIP 90894 |
11.16 |
| 2026-08-06 12:00 |
18:31:40.06 |
-42:09:58.5 |
HIP 90894 |
12.41 |
| 2026-08-07 00:00 |
18:31:32.20 |
-42:09:33.9 |
HIP 90894 |
13.71 |
| 2026-08-07 12:00 |
18:31:24.41 |
-42:09:08.9 |
HIP 90759 |
14.87 |
| 2026-08-08 00:00 |
18:31:16.69 |
-42:08:43.7 |
HIP 90759 |
14.13 |
| 2026-08-08 12:00 |
18:31:09.04 |
-42:08:18.1 |
HIP 90759 |
13.52 |
| 2026-08-09 00:00 |
18:31:01.47 |
-42:07:52.2 |
HIP 90759 |
13.05 |
| 2026-08-09 12:00 |
18:30:53.97 |
-42:07:26.0 |
HIP 90759 |
12.72 |
| 2026-08-10 00:00 |
18:30:46.54 |
-42:06:59.5 |
HIP 90759 |
12.54 |
| 2026-08-10 12:00 |
18:30:39.19 |
-42:06:32.6 |
HIP 90759 |
12.52 |
| 2026-08-11 00:00 |
18:30:31.92 |
-42:06:05.5 |
HIP 90759 |
12.66 |
| 2026-08-11 12:00 |
18:30:24.72 |
-42:05:38.0 |
HIP 90759 |
12.93 |
| 2026-08-12 00:00 |
18:30:17.60 |
-42:05:10.3 |
HIP 90759 |
13.34 |
| 2026-08-12 12:00 |
18:30:10.55 |
-42:04:42.2 |
HIP 90603 |
12.55 |
| 2026-08-13 00:00 |
18:30:03.59 |
-42:04:13.9 |
HIP 90603 |
11.23 |
| 2026-08-13 12:00 |
18:29:56.70 |
-42:03:45.3 |
HIP 90603 |
9.93 |
| 2026-08-14 00:00 |
18:29:49.90 |
-42:03:16.3 |
HIP 90603 |
8.67 |
| 2026-08-14 12:00 |
18:29:43.17 |
-42:02:47.1 |
HIP 90603 |
7.44 |
| 2026-08-15 00:00 |
18:29:36.53 |
-42:02:17.7 |
HIP 90603 |
6.25 |
| 2026-08-15 12:00 |
18:29:29.97 |
-42:01:47.9 |
HIP 90603 |
5.15 |
| 2026-08-16 00:00 |
18:29:23.48 |
-42:01:17.9 |
HIP 90603 |
4.17 |
| 2026-08-16 12:00 |
18:29:17.09 |
-42:00:47.6 |
HIP 90603 |
3.41 |
| 2026-08-17 00:00 |
18:29:10.77 |
-42:00:17.0 |
HIP 90603 |
3.03 |
| 2026-08-17 12:00 |
18:29:04.54 |
-41:59:46.2 |
HIP 90603 |
3.15 |
| 2026-08-18 00:00 |
18:28:58.39 |
-41:59:15.1 |
HIP 90603 |
3.71 |
| 2026-08-18 12:00 |
18:28:52.32 |
-41:58:43.8 |
HIP 90603 |
4.53 |
| 2026-08-19 00:00 |
18:28:46.34 |
-41:58:12.2 |
HIP 90603 |
5.50 |