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 |
-4.0345 |
+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) |
| 2026-07-29 00:00 |
22:37:40.15 |
-29:29:33.3 |
HIP 111705 |
26.89 |
| 2026-07-29 12:00 |
22:37:31.20 |
-29:31:31.6 |
HIP 111705 |
28.96 |
| 2026-07-30 00:00 |
22:37:22.18 |
-29:33:29.7 |
HIP 111705 |
31.15 |
| 2026-07-30 12:00 |
22:37:13.09 |
-29:35:27.4 |
HIP 111705 |
33.41 |
| 2026-07-31 00:00 |
22:37:03.93 |
-29:37:24.9 |
HIP 111705 |
35.76 |
| 2026-07-31 12:00 |
22:36:54.71 |
-29:39:22.2 |
HIP 111705 |
38.16 |
| 2026-08-01 00:00 |
22:36:45.42 |
-29:41:19.1 |
HIP 111705 |
40.61 |
| 2026-08-01 12:00 |
22:36:36.07 |
-29:43:15.8 |
HIP 111537 |
38.34 |
| 2026-08-02 00:00 |
22:36:26.66 |
-29:45:12.1 |
HIP 111537 |
35.95 |
| 2026-08-02 12:00 |
22:36:17.18 |
-29:47:08.1 |
HIP 111537 |
33.62 |
| 2026-08-03 00:00 |
22:36:07.64 |
-29:49:03.8 |
HIP 111537 |
31.38 |
| 2026-08-03 12:00 |
22:35:58.05 |
-29:50:59.2 |
HIP 111537 |
29.25 |
| 2026-08-04 00:00 |
22:35:48.39 |
-29:52:54.2 |
HIP 111537 |
27.25 |
| 2026-08-04 12:00 |
22:35:38.68 |
-29:54:48.8 |
HIP 111537 |
25.41 |
| 2026-08-05 00:00 |
22:35:28.91 |
-29:56:43.1 |
HIP 111537 |
23.78 |
| 2026-08-05 12:00 |
22:35:19.09 |
-29:58:37.0 |
HIP 111537 |
22.40 |
| 2026-08-06 00:00 |
22:35:09.21 |
-30:00:30.6 |
HIP 111537 |
21.33 |
| 2026-08-06 12:00 |
22:34:59.28 |
-30:02:23.7 |
HIP 111537 |
20.61 |
| 2026-08-07 00:00 |
22:34:49.30 |
-30:04:16.4 |
HIP 111537 |
20.28 |
| 2026-08-07 12:00 |
22:34:39.26 |
-30:06:08.8 |
HIP 111537 |
20.37 |
| 2026-08-08 00:00 |
22:34:29.18 |
-30:08:00.6 |
HIP 111537 |
20.86 |
| 2026-08-08 12:00 |
22:34:19.05 |
-30:09:52.1 |
HIP 111537 |
21.74 |
| 2026-08-09 00:00 |
22:34:08.86 |
-30:11:43.1 |
HIP 111290 |
22.30 |
| 2026-08-09 12:00 |
22:33:58.64 |
-30:13:33.7 |
HIP 111290 |
19.44 |
| 2026-08-10 00:00 |
22:33:48.37 |
-30:15:23.7 |
HIP 111290 |
16.59 |
| 2026-08-10 12:00 |
22:33:38.05 |
-30:17:13.3 |
HIP 111290 |
13.74 |
| 2026-08-11 00:00 |
22:33:27.69 |
-30:19:02.5 |
HIP 111290 |
10.90 |
| 2026-08-11 12:00 |
22:33:17.29 |
-30:20:51.1 |
HIP 111290 |
8.10 |
| 2026-08-12 00:00 |
22:33:06.85 |
-30:22:39.2 |
HIP 111290 |
5.37 |
| 2026-08-12 12:00 |
22:32:56.37 |
-30:24:26.8 |
HIP 111290 |
2.94 |
| 2026-08-13 00:00 |
22:32:45.86 |
-30:26:13.9 |
HIP 111290 |
2.26 |
| 2026-08-13 12:00 |
22:32:35.31 |
-30:28:00.4 |
HIP 111290 |
4.26 |
| 2026-08-14 00:00 |
22:32:24.72 |
-30:29:46.4 |
HIP 111290 |
6.92 |
| 2026-08-14 12:00 |
22:32:14.10 |
-30:31:31.8 |
HIP 111290 |
9.70 |
| 2026-08-15 00:00 |
22:32:03.45 |
-30:33:16.7 |
HIP 111290 |
12.53 |
| 2026-08-15 12:00 |
22:31:52.77 |
-30:35:01.0 |
HIP 111290 |
15.37 |
| 2026-08-16 00:00 |
22:31:42.06 |
-30:36:44.7 |
HIP 111290 |
18.22 |
| 2026-08-16 12:00 |
22:31:31.33 |
-30:38:27.8 |
HIP 111290 |
21.08 |
| 2026-08-17 00:00 |
22:31:20.56 |
-30:40:10.3 |
HIP 111290 |
23.94 |
| 2026-08-17 12:00 |
22:31:09.77 |
-30:41:52.2 |
HIP 111051 |
25.27 |
| 2026-08-18 00:00 |
22:30:58.96 |
-30:43:33.5 |
HIP 111051 |
22.48 |
| 2026-08-18 12:00 |
22:30:48.13 |
-30:45:14.2 |
HIP 111051 |
19.71 |
| 2026-08-19 00:00 |
22:30:37.27 |
-30:46:54.2 |
HIP 111051 |
16.99 |