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) |
| 2026-09-20 00:00 |
01:06:30.37 |
+06:58:23.8 |
HIP 5218 |
18.69 |
| 2026-09-20 12:00 |
01:06:12.22 |
+06:55:50.5 |
HIP 5218 |
17.66 |
| 2026-09-21 00:00 |
01:05:53.95 |
+06:53:16.4 |
HIP 5218 |
18.13 |
| 2026-09-21 12:00 |
01:05:35.57 |
+06:50:41.6 |
HIP 5073 |
16.49 |
| 2026-09-22 00:00 |
01:05:17.08 |
+06:48:06.0 |
HIP 5073 |
16.10 |
| 2026-09-22 12:00 |
01:04:58.49 |
+06:45:29.7 |
HIP 5073 |
17.39 |
| 2026-09-23 00:00 |
01:04:39.80 |
+06:42:52.7 |
HIP 4978 |
13.42 |
| 2026-09-23 12:00 |
01:04:21.01 |
+06:40:15.0 |
HIP 4978 |
10.13 |
| 2026-09-24 00:00 |
01:04:02.13 |
+06:37:36.7 |
HIP 4978 |
9.08 |
| 2026-09-24 12:00 |
01:03:43.16 |
+06:34:57.8 |
HIP 4978 |
10.97 |
| 2026-09-25 00:00 |
01:03:24.11 |
+06:32:18.3 |
HIP 4978 |
14.74 |
| 2026-09-25 12:00 |
01:03:04.97 |
+06:29:38.2 |
HIP 4978 |
19.34 |
| 2026-09-26 00:00 |
01:02:45.76 |
+06:26:57.6 |
HIP 4978 |
24.31 |
| 2026-09-26 12:00 |
01:02:26.46 |
+06:24:16.4 |
HIP 4978 |
29.48 |
| 2026-09-27 00:00 |
01:02:07.10 |
+06:21:34.8 |
HIP 4841 |
29.70 |
| 2026-09-27 12:00 |
01:01:47.67 |
+06:18:52.7 |
HIP 4686 |
24.79 |
| 2026-09-28 00:00 |
01:01:28.18 |
+06:16:10.2 |
HIP 4686 |
19.44 |
| 2026-09-28 12:00 |
01:01:08.63 |
+06:13:27.2 |
HIP 4686 |
14.22 |
| 2026-09-29 00:00 |
01:00:49.02 |
+06:10:43.8 |
HIP 4686 |
9.41 |
| 2026-09-29 12:00 |
01:00:29.35 |
+06:08:00.1 |
HIP 4686 |
6.08 |
| 2026-09-30 00:00 |
01:00:09.64 |
+06:05:16.1 |
HIP 4686 |
6.95 |
| 2026-09-30 12:00 |
00:59:49.89 |
+06:02:31.7 |
HIP 4686 |
11.08 |
| 2026-10-01 00:00 |
00:59:30.09 |
+05:59:47.0 |
HIP 4686 |
16.15 |
| 2026-10-01 12:00 |
00:59:10.25 |
+05:57:02.1 |
HIP 4518 |
19.53 |
| 2026-10-02 00:00 |
00:58:50.38 |
+05:54:16.9 |
HIP 4518 |
14.15 |
| 2026-10-02 12:00 |
00:58:30.48 |
+05:51:31.6 |
HIP 4518 |
9.09 |
| 2026-10-03 00:00 |
00:58:10.56 |
+05:48:46.0 |
HIP 4518 |
5.42 |
| 2026-10-03 12:00 |
00:57:50.61 |
+05:46:00.4 |
HIP 4518 |
6.36 |
| 2026-10-04 00:00 |
00:57:30.65 |
+05:43:14.6 |
HIP 4518 |
10.77 |
| 2026-10-04 12:00 |
00:57:10.67 |
+05:40:28.7 |
HIP 4518 |
16.01 |
| 2026-10-05 00:00 |
00:56:50.68 |
+05:37:42.7 |
HIP 4518 |
21.49 |
| 2026-10-05 12:00 |
00:56:30.68 |
+05:34:56.7 |
HIP 4325 |
21.28 |
| 2026-10-06 00:00 |
00:56:10.69 |
+05:32:10.7 |
HIP 4325 |
15.66 |
| 2026-10-06 12:00 |
00:55:50.69 |
+05:29:24.7 |
HIP 4325 |
10.13 |
| 2026-10-07 00:00 |
00:55:30.70 |
+05:26:38.8 |
HIP 4325 |
4.97 |
| 2026-10-07 12:00 |
00:55:10.73 |
+05:23:53.0 |
HIP 4325 |
3.41 |
| 2026-10-08 00:00 |
00:54:50.76 |
+05:21:07.2 |
HIP 4325 |
7.95 |
| 2026-10-08 12:00 |
00:54:30.82 |
+05:18:21.7 |
HIP 4325 |
13.39 |
| 2026-10-09 00:00 |
00:54:10.90 |
+05:15:36.3 |
HIP 4325 |
18.96 |
| 2026-10-09 12:00 |
00:53:51.01 |
+05:12:51.1 |
HIP 4173 |
14.85 |
| 2026-10-10 00:00 |
00:53:31.15 |
+05:10:06.1 |
HIP 4173 |
10.25 |
| 2026-10-10 12:00 |
00:53:11.32 |
+05:07:21.4 |
HIP 4173 |
7.31 |
| 2026-10-11 00:00 |
00:52:51.53 |
+05:04:37.0 |
HIP 4173 |
8.10 |