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) |
| 2026-07-29 00:00 |
11:13:33.21 |
+01:05:32.8 |
HIP 54889 |
17.03 |
| 2026-07-29 12:00 |
11:13:49.66 |
+01:03:35.5 |
HIP 54889 |
12.88 |
| 2026-07-30 00:00 |
11:14:06.17 |
+01:01:37.7 |
HIP 54889 |
9.12 |
| 2026-07-30 12:00 |
11:14:22.73 |
+00:59:39.6 |
HIP 54889 |
6.49 |
| 2026-07-31 00:00 |
11:14:39.34 |
+00:57:41.0 |
HIP 54889 |
6.56 |
| 2026-07-31 12:00 |
11:14:56.00 |
+00:55:42.0 |
HIP 54889 |
9.30 |
| 2026-08-01 00:00 |
11:15:12.71 |
+00:53:42.6 |
HIP 54889 |
13.15 |
| 2026-08-01 12:00 |
11:15:29.47 |
+00:51:42.8 |
HIP 54889 |
17.39 |
| 2026-08-02 00:00 |
11:15:46.28 |
+00:49:42.6 |
HIP 54994 |
15.49 |
| 2026-08-02 12:00 |
11:16:03.14 |
+00:47:42.0 |
HIP 54994 |
14.86 |
| 2026-08-03 00:00 |
11:16:20.05 |
+00:45:41.0 |
HIP 54994 |
15.66 |
| 2026-08-03 12:00 |
11:16:37.00 |
+00:43:39.6 |
HIP 54994 |
17.72 |
| 2026-08-04 00:00 |
11:16:54.00 |
+00:41:37.7 |
HIP 54994 |
20.66 |
| 2026-08-04 12:00 |
11:17:11.05 |
+00:39:35.6 |
HIP 54994 |
24.18 |
| 2026-08-05 00:00 |
11:17:28.14 |
+00:37:33.0 |
HIP 55277 |
27.49 |
| 2026-08-05 12:00 |
11:17:45.28 |
+00:35:30.0 |
HIP 55277 |
23.92 |
| 2026-08-06 00:00 |
11:18:02.46 |
+00:33:26.6 |
HIP 55277 |
20.81 |
| 2026-08-06 12:00 |
11:18:19.69 |
+00:31:22.9 |
HIP 55277 |
18.43 |
| 2026-08-07 00:00 |
11:18:36.96 |
+00:29:18.8 |
HIP 55277 |
17.08 |
| 2026-08-07 12:00 |
11:18:54.27 |
+00:27:14.3 |
HIP 55277 |
17.02 |
| 2026-08-08 00:00 |
11:19:11.63 |
+00:25:09.4 |
HIP 55369 |
18.25 |
| 2026-08-08 12:00 |
11:19:29.02 |
+00:23:04.2 |
HIP 55369 |
13.44 |
| 2026-08-09 00:00 |
11:19:46.46 |
+00:20:58.6 |
HIP 55369 |
8.62 |
| 2026-08-09 12:00 |
11:20:03.94 |
+00:18:52.7 |
HIP 55369 |
3.83 |
| 2026-08-10 00:00 |
11:20:21.45 |
+00:16:46.4 |
HIP 55369 |
1.45 |
| 2026-08-10 12:00 |
11:20:39.01 |
+00:14:39.7 |
HIP 55369 |
6.07 |
| 2026-08-11 00:00 |
11:20:56.60 |
+00:12:32.7 |
HIP 55369 |
10.92 |
| 2026-08-11 12:00 |
11:21:14.23 |
+00:10:25.4 |
HIP 55496 |
12.96 |
| 2026-08-12 00:00 |
11:21:31.90 |
+00:08:17.7 |
HIP 55496 |
8.14 |
| 2026-08-12 12:00 |
11:21:49.60 |
+00:06:09.7 |
HIP 55496 |
3.56 |
| 2026-08-13 00:00 |
11:22:07.34 |
+00:04:01.3 |
HIP 55496 |
2.71 |
| 2026-08-13 12:00 |
11:22:25.11 |
+00:01:52.6 |
HIP 55496 |
7.12 |
| 2026-08-14 00:00 |
11:22:42.92 |
-00:00:16.4 |
HIP 55496 |
11.95 |
| 2026-08-14 12:00 |
11:23:00.76 |
-00:02:25.7 |
HIP 55595 |
11.21 |
| 2026-08-15 00:00 |
11:23:18.64 |
-00:04:35.3 |
HIP 55595 |
12.51 |
| 2026-08-15 12:00 |
11:23:36.54 |
-00:06:45.3 |
HIP 55595 |
15.40 |
| 2026-08-16 00:00 |
11:23:54.48 |
-00:08:55.6 |
HIP 55595 |
19.16 |
| 2026-08-16 12:00 |
11:24:12.45 |
-00:11:06.1 |
HIP 55595 |
23.40 |
| 2026-08-17 00:00 |
11:24:30.44 |
-00:13:17.0 |
HIP 55595 |
27.89 |
| 2026-08-17 12:00 |
11:24:48.47 |
-00:15:28.1 |
HIP 55595 |
32.54 |
| 2026-08-18 00:00 |
11:25:06.52 |
-00:17:39.6 |
HIP 55595 |
37.30 |
| 2026-08-18 12:00 |
11:25:24.61 |
-00:19:51.3 |
HIP 55595 |
42.12 |
| 2026-08-19 00:00 |
11:25:42.72 |
-00:22:03.3 |
HIP 55800 |
42.85 |