メタデータ
| 項目 |
値 |
| Designation |
154P/Brewington |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-12-12T20:02:35.404800Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T15:12:51Z |
| Obs used |
2636 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
15.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-27.0000000 |
| e |
0.67197880 |
| q (au) |
1.601379 |
| a (au) |
4.881937 |
| i (deg) |
17.885394 |
| Ω (om, deg) |
343.428377 |
| ω (w, deg) |
48.913742 |
| M (ma, deg) |
45.701350 |
等級
散乱 + 全体線形
$$
M_a = (11.477 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.477 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.875 |
| δ90 |
1.000 |
| 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 |
| 2024-05-25 |
2024-09-11 |
+15.8219 |
-4.860 |
| 2024-09-11 |
2025-03-06 |
+1.5067 |
-0.658 |
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) |
| 2026-06-01 00:00 |
10:51:05.56 |
+03:47:23.5 |
HIP 53026 |
12.14 |
| 2026-06-01 12:00 |
10:51:10.61 |
+03:46:41.2 |
HIP 53026 |
11.74 |
| 2026-06-02 00:00 |
10:51:15.80 |
+03:45:58.0 |
HIP 53026 |
11.52 |
| 2026-06-02 12:00 |
10:51:21.13 |
+03:45:14.0 |
HIP 53026 |
11.49 |
| 2026-06-03 00:00 |
10:51:26.61 |
+03:44:29.1 |
HIP 53026 |
11.67 |
| 2026-06-03 12:00 |
10:51:32.23 |
+03:43:43.4 |
HIP 53142 |
11.03 |
| 2026-06-04 00:00 |
10:51:38.00 |
+03:42:56.9 |
HIP 53142 |
9.84 |
| 2026-06-04 12:00 |
10:51:43.91 |
+03:42:09.5 |
HIP 53142 |
8.76 |
| 2026-06-05 00:00 |
10:51:49.96 |
+03:41:21.3 |
HIP 53142 |
7.86 |
| 2026-06-05 12:00 |
10:51:56.14 |
+03:40:32.2 |
HIP 53142 |
7.26 |
| 2026-06-06 00:00 |
10:52:02.47 |
+03:39:42.4 |
HIP 53142 |
7.04 |
| 2026-06-06 12:00 |
10:52:08.94 |
+03:38:51.7 |
HIP 53142 |
7.27 |
| 2026-06-07 00:00 |
10:52:15.55 |
+03:38:00.1 |
HIP 53142 |
7.94 |
| 2026-06-07 12:00 |
10:52:22.29 |
+03:37:07.8 |
HIP 53142 |
8.97 |
| 2026-06-08 00:00 |
10:52:29.17 |
+03:36:14.6 |
HIP 53142 |
10.27 |
| 2026-06-08 12:00 |
10:52:36.18 |
+03:35:20.7 |
HIP 53142 |
11.78 |
| 2026-06-09 00:00 |
10:52:43.33 |
+03:34:25.9 |
HIP 53142 |
13.43 |
| 2026-06-09 12:00 |
10:52:50.61 |
+03:33:30.3 |
HIP 53142 |
15.20 |
| 2026-06-10 00:00 |
10:52:58.03 |
+03:32:33.9 |
HIP 53286 |
16.85 |
| 2026-06-10 12:00 |
10:53:05.58 |
+03:31:36.7 |
HIP 53286 |
15.95 |
| 2026-06-11 00:00 |
10:53:13.26 |
+03:30:38.7 |
HIP 53286 |
15.27 |
| 2026-06-11 12:00 |
10:53:21.07 |
+03:29:39.9 |
HIP 53286 |
14.86 |
| 2026-06-12 00:00 |
10:53:29.01 |
+03:28:40.3 |
HIP 53286 |
14.77 |
| 2026-06-12 12:00 |
10:53:37.08 |
+03:27:40.0 |
HIP 53286 |
15.01 |
| 2026-06-13 00:00 |
10:53:45.28 |
+03:26:38.8 |
HIP 53286 |
15.59 |
| 2026-06-13 12:00 |
10:53:53.61 |
+03:25:36.9 |
HIP 53286 |
16.48 |
| 2026-06-14 00:00 |
10:54:02.07 |
+03:24:34.1 |
HIP 53286 |
17.64 |
| 2026-06-14 12:00 |
10:54:10.65 |
+03:23:30.6 |
HIP 53286 |
19.05 |
| 2026-06-15 00:00 |
10:54:19.35 |
+03:22:26.3 |
HIP 53286 |
20.66 |
| 2026-06-15 12:00 |
10:54:28.18 |
+03:21:21.3 |
HIP 53286 |
22.45 |
| 2026-06-16 00:00 |
10:54:37.14 |
+03:20:15.5 |
HIP 53286 |
24.37 |
| 2026-06-16 12:00 |
10:54:46.22 |
+03:19:08.9 |
HIP 53286 |
26.41 |
| 2026-06-17 00:00 |
10:54:55.41 |
+03:18:01.5 |
HIP 53286 |
28.56 |
| 2026-06-17 12:00 |
10:55:04.73 |
+03:16:53.5 |
HIP 53512 |
28.10 |
| 2026-06-18 00:00 |
10:55:14.17 |
+03:15:44.6 |
HIP 53512 |
26.38 |
| 2026-06-18 12:00 |
10:55:23.73 |
+03:14:35.0 |
HIP 53512 |
24.81 |
| 2026-06-19 00:00 |
10:55:33.40 |
+03:13:24.7 |
HIP 53512 |
23.41 |
| 2026-06-19 12:00 |
10:55:43.19 |
+03:12:13.6 |
HIP 53512 |
22.24 |
| 2026-06-20 00:00 |
10:55:53.10 |
+03:11:01.8 |
HIP 53512 |
21.34 |
| 2026-06-20 12:00 |
10:56:03.12 |
+03:09:49.3 |
HIP 53512 |
20.76 |
| 2026-06-21 00:00 |
10:56:13.26 |
+03:08:36.1 |
HIP 53512 |
20.54 |
| 2026-06-21 12:00 |
10:56:23.51 |
+03:07:22.1 |
HIP 53512 |
20.71 |
| 2026-06-22 00:00 |
10:56:33.87 |
+03:06:07.4 |
HIP 53512 |
21.26 |