メタデータ
| 項目 |
値 |
| Designation |
89P/Russell 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-12-14T20:36:28.673280Z |
| Orbit solution date (soln_date, UTC) |
2025-11-13T13:54:38Z |
| Obs used |
648 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
21.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-07-19.0000000 |
| e |
0.40842673 |
| q (au) |
2.220297 |
| a (au) |
3.753208 |
| i (deg) |
12.076267 |
| Ω (om, deg) |
41.443124 |
| ω (w, deg) |
250.178436 |
| M (ma, deg) |
78.773821 |
等級
散乱 + 全体線形
$$
M_a = (10.324 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.324 |
| n |
6.000 |
| gf |
0.856 |
| gb |
-0.758 |
| k |
0.985 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
03:43:05.52 |
+25:03:26.2 |
HIP 17403 |
8.64 |
| 2026-03-26 12:00 |
03:43:30.42 |
+25:04:46.3 |
HIP 17403 |
2.89 |
| 2026-03-27 00:00 |
03:43:55.43 |
+25:06:06.6 |
HIP 17403 |
3.04 |
| 2026-03-27 12:00 |
03:44:20.53 |
+25:07:27.0 |
HIP 17403 |
8.85 |
| 2026-03-28 00:00 |
03:44:45.74 |
+25:08:47.6 |
HIP 17403 |
14.70 |
| 2026-03-28 12:00 |
03:45:11.05 |
+25:10:08.5 |
HIP 17583 |
17.55 |
| 2026-03-29 00:00 |
03:45:36.46 |
+25:11:29.4 |
HIP 17583 |
13.45 |
| 2026-03-29 12:00 |
03:46:01.97 |
+25:12:50.6 |
HIP 17583 |
11.10 |
| 2026-03-30 00:00 |
03:46:27.58 |
+25:14:11.9 |
HIP 17583 |
11.66 |
| 2026-03-30 12:00 |
03:46:53.29 |
+25:15:33.4 |
HIP 17729 |
14.28 |
| 2026-03-31 00:00 |
03:47:19.09 |
+25:16:55.0 |
HIP 17729 |
8.84 |
| 2026-03-31 12:00 |
03:47:44.98 |
+25:18:16.7 |
HIP 17729 |
4.89 |
| 2026-04-01 00:00 |
03:48:10.97 |
+25:19:38.6 |
HIP 17729 |
6.48 |
| 2026-04-01 12:00 |
03:48:37.06 |
+25:21:00.7 |
HIP 17729 |
11.55 |
| 2026-04-02 00:00 |
03:49:03.23 |
+25:22:22.8 |
HIP 17729 |
17.28 |
| 2026-04-02 12:00 |
03:49:29.50 |
+25:23:45.1 |
HIP 17954 |
15.68 |
| 2026-04-03 00:00 |
03:49:55.86 |
+25:25:07.6 |
HIP 17954 |
10.97 |
| 2026-04-03 12:00 |
03:50:22.31 |
+25:26:30.1 |
HIP 17954 |
8.31 |
| 2026-04-04 00:00 |
03:50:48.85 |
+25:27:52.8 |
HIP 17954 |
9.65 |
| 2026-04-04 12:00 |
03:51:15.48 |
+25:29:15.5 |
HIP 17954 |
13.90 |
| 2026-04-05 00:00 |
03:51:42.19 |
+25:30:38.4 |
HIP 17954 |
19.24 |
| 2026-04-05 12:00 |
03:52:09.00 |
+25:32:01.3 |
HIP 18175 |
19.77 |
| 2026-04-06 00:00 |
03:52:35.89 |
+25:33:24.4 |
HIP 18175 |
14.69 |
| 2026-04-06 12:00 |
03:53:02.86 |
+25:34:47.5 |
HIP 18201 |
9.43 |
| 2026-04-07 00:00 |
03:53:29.92 |
+25:36:10.7 |
HIP 18201 |
4.91 |
| 2026-04-07 12:00 |
03:53:57.06 |
+25:37:34.1 |
HIP 18201 |
6.13 |
| 2026-04-08 00:00 |
03:54:24.29 |
+25:38:57.4 |
HIP 18273 |
7.30 |
| 2026-04-08 12:00 |
03:54:51.60 |
+25:40:20.9 |
HIP 18273 |
9.35 |
| 2026-04-09 00:00 |
03:55:18.99 |
+25:41:44.4 |
HIP 18273 |
14.20 |
| 2026-04-09 12:00 |
03:55:46.46 |
+25:43:08.0 |
HIP 18273 |
19.92 |
| 2026-04-10 00:00 |
03:56:14.02 |
+25:44:31.6 |
HIP 18273 |
25.94 |
| 2026-04-10 12:00 |
03:56:41.65 |
+25:45:55.3 |
HIP 18491 |
29.74 |
| 2026-04-11 00:00 |
03:57:09.36 |
+25:47:19.1 |
HIP 18491 |
30.35 |
| 2026-04-11 12:00 |
03:57:37.14 |
+25:48:42.9 |
HIP 18491 |
32.26 |
| 2026-04-12 00:00 |
03:58:05.01 |
+25:50:06.7 |
HIP 18630 |
28.80 |
| 2026-04-12 12:00 |
03:58:32.95 |
+25:51:30.5 |
HIP 18630 |
24.65 |
| 2026-04-13 00:00 |
03:59:00.97 |
+25:52:54.4 |
HIP 18630 |
21.65 |
| 2026-04-13 12:00 |
03:59:29.06 |
+25:54:18.4 |
HIP 18630 |
20.32 |
| 2026-04-14 00:00 |
03:59:57.22 |
+25:55:42.3 |
HIP 18630 |
20.99 |
| 2026-04-14 12:00 |
04:00:25.46 |
+25:57:06.3 |
HIP 18815 |
20.29 |
| 2026-04-15 00:00 |
04:00:53.77 |
+25:58:30.3 |
HIP 18815 |
14.19 |
| 2026-04-15 12:00 |
04:01:22.15 |
+25:59:54.3 |
HIP 18815 |
8.71 |
| 2026-04-16 00:00 |
04:01:50.60 |
+26:01:18.3 |
HIP 18815 |
5.98 |