メタデータ
| 項目 |
値 |
| Designation |
91P/Russell 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-06-27T02:09:49.521600Z |
| Orbit solution date (soln_date, UTC) |
2021-09-07T13:51:26Z |
| Obs used |
337 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
21.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-04-19.0000000 |
| e |
0.33022414 |
| q (au) |
2.605665 |
| a (au) |
3.890354 |
| i (deg) |
14.092166 |
| Ω (om, deg) |
247.895980 |
| ω (w, deg) |
354.865752 |
| M (ma, deg) |
131.902421 |
等級
散乱 + 全体線形
$$
M_a = (17.424 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.424 |
| n |
2.000 |
| gf |
0.832 |
| gb |
-0.704 |
| k |
0.891 |
| δ90 |
2.147 |
| 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 |
08:39:44.71 |
+05:57:01.0 |
HIP 42491 |
10.74 |
| 2026-09-20 12:00 |
08:40:09.54 |
+05:54:09.4 |
HIP 42491 |
10.03 |
| 2026-09-21 00:00 |
08:40:34.29 |
+05:51:17.5 |
HIP 42491 |
13.34 |
| 2026-09-21 12:00 |
08:40:58.95 |
+05:48:25.1 |
HIP 42491 |
18.62 |
| 2026-09-22 00:00 |
08:41:23.51 |
+05:45:32.5 |
HIP 42635 |
22.53 |
| 2026-09-22 12:00 |
08:41:47.99 |
+05:42:39.4 |
HIP 42635 |
20.90 |
| 2026-09-23 00:00 |
08:42:12.38 |
+05:39:46.1 |
HIP 42635 |
21.36 |
| 2026-09-23 12:00 |
08:42:36.68 |
+05:36:52.4 |
HIP 42804 |
23.09 |
| 2026-09-24 00:00 |
08:43:00.88 |
+05:33:58.4 |
HIP 42804 |
18.40 |
| 2026-09-24 12:00 |
08:43:25.00 |
+05:31:04.0 |
HIP 42804 |
15.27 |
| 2026-09-25 00:00 |
08:43:49.02 |
+05:28:09.3 |
HIP 42804 |
14.70 |
| 2026-09-25 12:00 |
08:44:12.94 |
+05:25:14.3 |
HIP 42899 |
9.28 |
| 2026-09-26 00:00 |
08:44:36.77 |
+05:22:19.0 |
HIP 42899 |
5.35 |
| 2026-09-26 12:00 |
08:45:00.51 |
+05:19:23.4 |
HIP 42899 |
7.63 |
| 2026-09-27 00:00 |
08:45:24.15 |
+05:16:27.5 |
HIP 43047 |
12.06 |
| 2026-09-27 12:00 |
08:45:47.69 |
+05:13:31.2 |
HIP 43047 |
7.19 |
| 2026-09-28 00:00 |
08:46:11.13 |
+05:10:34.7 |
HIP 43047 |
6.64 |
| 2026-09-28 12:00 |
08:46:34.48 |
+05:07:37.9 |
HIP 43047 |
11.04 |
| 2026-09-29 00:00 |
08:46:57.73 |
+05:04:40.7 |
HIP 43047 |
16.85 |
| 2026-09-29 12:00 |
08:47:20.87 |
+05:01:43.3 |
HIP 43047 |
23.02 |
| 2026-09-30 00:00 |
08:47:43.92 |
+04:58:45.6 |
HIP 43047 |
29.30 |
| 2026-09-30 12:00 |
08:48:06.86 |
+04:55:47.6 |
HIP 43211 |
35.38 |
| 2026-10-01 00:00 |
08:48:29.70 |
+04:52:49.4 |
HIP 43211 |
32.80 |
| 2026-10-01 12:00 |
08:48:52.44 |
+04:49:50.9 |
HIP 43211 |
31.34 |
| 2026-10-02 00:00 |
08:49:15.07 |
+04:46:52.1 |
HIP 43211 |
31.13 |
| 2026-10-02 12:00 |
08:49:37.59 |
+04:43:53.1 |
HIP 43211 |
32.18 |
| 2026-10-03 00:00 |
08:50:00.01 |
+04:40:53.8 |
HIP 43516 |
30.85 |
| 2026-10-03 12:00 |
08:50:22.32 |
+04:37:54.3 |
HIP 43539 |
27.08 |
| 2026-10-04 00:00 |
08:50:44.53 |
+04:34:54.5 |
HIP 43539 |
20.85 |
| 2026-10-04 12:00 |
08:51:06.62 |
+04:31:54.5 |
HIP 43539 |
14.69 |
| 2026-10-05 00:00 |
08:51:28.60 |
+04:28:54.2 |
HIP 43539 |
8.72 |
| 2026-10-05 12:00 |
08:51:50.47 |
+04:25:53.8 |
HIP 43539 |
3.83 |
| 2026-10-06 00:00 |
08:52:12.23 |
+04:22:53.1 |
HIP 43539 |
5.54 |
| 2026-10-06 12:00 |
08:52:33.87 |
+04:19:52.2 |
HIP 43539 |
11.10 |
| 2026-10-07 00:00 |
08:52:55.40 |
+04:16:51.2 |
HIP 43518 |
16.58 |
| 2026-10-07 12:00 |
08:53:16.81 |
+04:13:49.9 |
HIP 43668 |
20.35 |
| 2026-10-08 00:00 |
08:53:38.10 |
+04:10:48.4 |
HIP 43668 |
16.00 |
| 2026-10-08 12:00 |
08:53:59.28 |
+04:07:46.8 |
HIP 43668 |
13.12 |
| 2026-10-09 00:00 |
08:54:20.33 |
+04:04:44.9 |
HIP 43773 |
10.25 |
| 2026-10-09 12:00 |
08:54:41.27 |
+04:01:42.9 |
HIP 43773 |
8.25 |
| 2026-10-10 00:00 |
08:55:02.08 |
+03:58:40.8 |
HIP 43773 |
10.20 |
| 2026-10-10 12:00 |
08:55:22.78 |
+03:55:38.5 |
HIP 43773 |
14.56 |
| 2026-10-11 00:00 |
08:55:43.34 |
+03:52:36.0 |
HIP 43773 |
19.78 |