メタデータ
| 項目 |
値 |
| Designation |
105P/Singer Brewster |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-02-25T23:41:27.876480Z |
| Orbit solution date (soln_date, UTC) |
2025-10-06T22:38:31Z |
| Obs used |
898 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-09-15.0000000 |
| e |
0.40905926 |
| q (au) |
2.050165 |
| a (au) |
3.469324 |
| i (deg) |
9.171690 |
| Ω (om, deg) |
192.411758 |
| ω (w, deg) |
46.610938 |
| M (ma, deg) |
86.482795 |
等級
散乱 + 全体線形
$$
M_a = (18.483 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.483 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.677 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:36:32.38 |
+00:13:33.2 |
HIP 116454 |
17.02 |
| 2026-03-26 12:00 |
23:37:09.14 |
+00:17:02.7 |
HIP 116454 |
22.17 |
| 2026-03-27 00:00 |
23:37:45.84 |
+00:20:32.0 |
HIP 116646 |
27.58 |
| 2026-03-27 12:00 |
23:38:22.49 |
+00:24:01.1 |
HIP 116646 |
22.86 |
| 2026-03-28 00:00 |
23:38:59.09 |
+00:27:29.9 |
HIP 116646 |
21.83 |
| 2026-03-28 12:00 |
23:39:35.63 |
+00:30:58.6 |
HIP 116823 |
17.25 |
| 2026-03-29 00:00 |
23:40:12.12 |
+00:34:27.1 |
HIP 116823 |
11.82 |
| 2026-03-29 12:00 |
23:40:48.55 |
+00:37:55.3 |
HIP 116823 |
13.12 |
| 2026-03-30 00:00 |
23:41:24.92 |
+00:41:23.3 |
HIP 116823 |
19.86 |
| 2026-03-30 12:00 |
23:42:01.24 |
+00:44:51.1 |
HIP 117013 |
20.63 |
| 2026-03-31 00:00 |
23:42:37.51 |
+00:48:18.7 |
HIP 117013 |
11.04 |
| 2026-03-31 12:00 |
23:43:13.71 |
+00:51:46.0 |
HIP 117013 |
2.52 |
| 2026-04-01 00:00 |
23:43:49.86 |
+00:55:13.1 |
HIP 117013 |
8.85 |
| 2026-04-01 12:00 |
23:44:25.95 |
+00:58:39.9 |
HIP 117097 |
16.04 |
| 2026-04-02 00:00 |
23:45:01.99 |
+01:02:06.5 |
HIP 117097 |
22.24 |
| 2026-04-02 12:00 |
23:45:37.97 |
+01:05:32.9 |
HIP 117097 |
30.29 |
| 2026-04-03 00:00 |
23:46:13.89 |
+01:08:59.0 |
HIP 117195 |
32.03 |
| 2026-04-03 12:00 |
23:46:49.75 |
+01:12:24.8 |
HIP 117195 |
31.95 |
| 2026-04-04 00:00 |
23:47:25.55 |
+01:15:50.3 |
HIP 117491 |
32.49 |
| 2026-04-04 12:00 |
23:48:01.30 |
+01:19:15.6 |
HIP 117491 |
26.07 |
| 2026-04-05 00:00 |
23:48:36.99 |
+01:22:40.6 |
HIP 117491 |
22.07 |
| 2026-04-05 12:00 |
23:49:12.61 |
+01:26:05.3 |
HIP 117491 |
21.83 |
| 2026-04-06 00:00 |
23:49:48.18 |
+01:29:29.7 |
HIP 117491 |
25.46 |
| 2026-04-06 12:00 |
23:50:23.69 |
+01:32:53.9 |
HIP 117529 |
25.62 |
| 2026-04-07 00:00 |
23:50:59.14 |
+01:36:17.7 |
HIP 117704 |
20.44 |
| 2026-04-07 12:00 |
23:51:34.53 |
+01:39:41.2 |
HIP 117704 |
14.40 |
| 2026-04-08 00:00 |
23:52:09.85 |
+01:43:04.5 |
HIP 117704 |
13.28 |
| 2026-04-08 12:00 |
23:52:45.12 |
+01:46:27.4 |
HIP 117805 |
12.65 |
| 2026-04-09 00:00 |
23:53:20.32 |
+01:49:50.0 |
HIP 117805 |
8.24 |
| 2026-04-09 12:00 |
23:53:55.47 |
+01:53:12.3 |
HIP 117805 |
12.38 |
| 2026-04-10 00:00 |
23:54:30.55 |
+01:56:34.2 |
HIP 117805 |
20.37 |
| 2026-04-10 12:00 |
23:55:05.56 |
+01:59:55.8 |
HIP 118030 |
21.80 |
| 2026-04-11 00:00 |
23:55:40.52 |
+02:03:17.1 |
HIP 118030 |
14.95 |
| 2026-04-11 12:00 |
23:56:15.41 |
+02:06:38.1 |
HIP 118030 |
12.13 |
| 2026-04-12 00:00 |
23:56:50.24 |
+02:09:58.6 |
HIP 118030 |
15.65 |
| 2026-04-12 12:00 |
23:57:25.00 |
+02:13:18.9 |
HIP 118030 |
22.70 |
| 2026-04-13 00:00 |
23:57:59.70 |
+02:16:38.7 |
HIP 118030 |
30.96 |
| 2026-04-13 12:00 |
23:58:34.33 |
+02:19:58.3 |
HIP 118221 |
30.08 |
| 2026-04-14 00:00 |
23:59:08.90 |
+02:23:17.4 |
HIP 31 |
25.39 |
| 2026-04-14 12:00 |
23:59:43.40 |
+02:26:36.1 |
HIP 31 |
17.16 |
| 2026-04-15 00:00 |
00:00:17.83 |
+02:29:54.5 |
HIP 31 |
10.72 |
| 2026-04-15 12:00 |
00:00:52.20 |
+02:33:12.5 |
HIP 31 |
10.24 |
| 2026-04-16 00:00 |
00:01:26.50 |
+02:36:30.0 |
HIP 31 |
16.23 |