C/2022 U4 (Bok)
メタデータ
| 項目 |
値 |
| Designation |
C/2022 U4 (Bok) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-08-03T16:19:50.327040Z |
| Orbit solution date (soln_date, UTC) |
2023-11-18T17:43:20Z |
| Obs used |
691 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
8.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-10-26T11:34:51.024000Z |
| Discovery magnitude (MPC) |
20.21 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) |
2023-04-13.0000000 |
| e |
0.99921142 |
| q (au) |
2.898398 |
| a (au) |
3675.478615 |
| i (deg) |
52.035423 |
| Ω (om, deg) |
132.928981 |
| ω (w, deg) |
89.007568 |
| M (ma, deg) |
359.999502 |
等級
散乱 + 全体線形
$$
M_a = (12.000 + 5.079\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.000 |
| n |
5.079 |
| gf |
1.000 |
| gb |
-0.736 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-01-07 |
2023-02-26 |
+3.2013 |
-2.039 |
| 2023-02-26 |
2023-08-02 |
-4.0360 |
+2.011 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:57:01.93 |
-25:19:50.4 |
HIP 108306 |
12.47 |
| 2026-02-03 12:00 |
21:57:18.46 |
-25:19:06.9 |
HIP 108306 |
15.45 |
| 2026-02-04 00:00 |
21:57:35.00 |
-25:18:23.6 |
HIP 108306 |
18.73 |
| 2026-02-04 12:00 |
21:57:51.55 |
-25:17:40.4 |
HIP 108520 |
17.34 |
| 2026-02-05 00:00 |
21:58:08.10 |
-25:16:57.4 |
HIP 108520 |
13.91 |
| 2026-02-05 12:00 |
21:58:24.65 |
-25:16:14.6 |
HIP 108520 |
10.73 |
| 2026-02-06 00:00 |
21:58:41.21 |
-25:15:31.9 |
HIP 108520 |
8.11 |
| 2026-02-06 12:00 |
21:58:57.77 |
-25:14:49.5 |
HIP 108520 |
6.74 |
| 2026-02-07 00:00 |
21:59:14.34 |
-25:14:07.2 |
HIP 108520 |
7.35 |
| 2026-02-07 12:00 |
21:59:30.90 |
-25:13:25.1 |
HIP 108520 |
9.57 |
| 2026-02-08 00:00 |
21:59:47.47 |
-25:12:43.2 |
HIP 108520 |
12.58 |
| 2026-02-08 12:00 |
22:00:04.04 |
-25:12:01.5 |
HIP 108520 |
15.93 |
| 2026-02-09 00:00 |
22:00:20.61 |
-25:11:20.0 |
HIP 108705 |
15.91 |
| 2026-02-09 12:00 |
22:00:37.18 |
-25:10:38.8 |
HIP 108705 |
12.83 |
| 2026-02-10 00:00 |
22:00:53.74 |
-25:09:57.7 |
HIP 108705 |
10.26 |
| 2026-02-10 12:00 |
22:01:10.31 |
-25:09:16.8 |
HIP 108705 |
8.66 |
| 2026-02-11 00:00 |
22:01:26.87 |
-25:08:36.2 |
HIP 108705 |
8.59 |
| 2026-02-11 12:00 |
22:01:43.43 |
-25:07:55.8 |
HIP 108705 |
10.09 |
| 2026-02-12 00:00 |
22:02:00.00 |
-25:07:15.6 |
HIP 108705 |
12.60 |
| 2026-02-12 12:00 |
22:02:16.55 |
-25:06:35.7 |
HIP 108705 |
15.65 |
| 2026-02-13 00:00 |
22:02:33.09 |
-25:05:56.0 |
HIP 108742 |
18.35 |
| 2026-02-13 12:00 |
22:02:49.64 |
-25:05:16.5 |
HIP 108923 |
20.38 |
| 2026-02-14 00:00 |
22:03:06.17 |
-25:04:37.3 |
HIP 108923 |
17.42 |
| 2026-02-14 12:00 |
22:03:22.70 |
-25:03:58.3 |
HIP 108923 |
14.85 |
| 2026-02-15 00:00 |
22:03:39.23 |
-25:03:19.6 |
HIP 108923 |
12.92 |
| 2026-02-15 12:00 |
22:03:55.74 |
-25:02:41.2 |
HIP 108985 |
11.89 |
| 2026-02-16 00:00 |
22:04:12.25 |
-25:02:03.0 |
HIP 108985 |
8.91 |
| 2026-02-16 12:00 |
22:04:28.75 |
-25:01:25.0 |
HIP 108985 |
6.78 |
| 2026-02-17 00:00 |
22:04:45.23 |
-25:00:47.4 |
HIP 108985 |
6.42 |
| 2026-02-17 12:00 |
22:05:01.71 |
-25:00:10.0 |
HIP 108985 |
8.07 |
| 2026-02-18 00:00 |
22:05:18.17 |
-24:59:32.9 |
HIP 108985 |
10.84 |
| 2026-02-18 12:00 |
22:05:34.63 |
-24:58:56.1 |
HIP 108985 |
14.08 |
| 2026-02-19 00:00 |
22:05:51.07 |
-24:58:19.6 |
HIP 108985 |
17.54 |
| 2026-02-19 12:00 |
22:06:07.49 |
-24:57:43.4 |
HIP 108985 |
21.09 |
| 2026-02-20 00:00 |
22:06:23.90 |
-24:57:07.5 |
HIP 108985 |
24.71 |
| 2026-02-20 12:00 |
22:06:40.30 |
-24:56:31.9 |
HIP 108985 |
28.36 |
| 2026-02-21 00:00 |
22:06:56.68 |
-24:55:56.6 |
HIP 108985 |
32.03 |
| 2026-02-21 12:00 |
22:07:13.05 |
-24:55:21.6 |
HIP 109222 |
32.23 |
| 2026-02-22 00:00 |
22:07:29.40 |
-24:54:46.9 |
HIP 109222 |
31.23 |
| 2026-02-22 12:00 |
22:07:45.73 |
-24:54:12.5 |
HIP 109222 |
30.66 |
| 2026-02-23 00:00 |
22:08:02.05 |
-24:53:38.5 |
HIP 109222 |
30.54 |
| 2026-02-23 12:00 |
22:08:18.34 |
-24:53:04.8 |
HIP 109222 |
30.90 |
| 2026-02-24 00:00 |
22:08:34.62 |
-24:52:31.4 |
HIP 109222 |
31.69 |