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) |
| 2026-07-29 00:00 |
05:47:24.50 |
+29:55:52.4 |
HIP 27336 |
16.40 |
| 2026-07-29 12:00 |
05:47:51.84 |
+29:56:40.9 |
HIP 27336 |
18.18 |
| 2026-07-30 00:00 |
05:48:19.10 |
+29:57:29.3 |
HIP 27488 |
14.47 |
| 2026-07-30 12:00 |
05:48:46.27 |
+29:58:17.7 |
HIP 27488 |
9.64 |
| 2026-07-31 00:00 |
05:49:13.36 |
+29:59:06.0 |
HIP 27488 |
6.85 |
| 2026-07-31 12:00 |
05:49:40.37 |
+29:59:54.2 |
HIP 27488 |
8.41 |
| 2026-08-01 00:00 |
05:50:07.29 |
+30:00:42.4 |
HIP 27488 |
12.79 |
| 2026-08-01 12:00 |
05:50:34.13 |
+30:01:30.4 |
HIP 27488 |
18.03 |
| 2026-08-02 00:00 |
05:51:00.88 |
+30:02:18.4 |
HIP 27488 |
23.55 |
| 2026-08-02 12:00 |
05:51:27.55 |
+30:03:06.4 |
HIP 27783 |
24.11 |
| 2026-08-03 00:00 |
05:51:54.12 |
+30:03:54.3 |
HIP 27783 |
21.11 |
| 2026-08-03 12:00 |
05:52:20.61 |
+30:04:42.1 |
HIP 27786 |
19.37 |
| 2026-08-04 00:00 |
05:52:47.01 |
+30:05:29.9 |
HIP 27786 |
19.28 |
| 2026-08-04 12:00 |
05:53:13.32 |
+30:06:17.6 |
HIP 27786 |
20.84 |
| 2026-08-05 00:00 |
05:53:39.53 |
+30:07:05.3 |
HIP 27786 |
23.73 |
| 2026-08-05 12:00 |
05:54:05.66 |
+30:07:52.9 |
HIP 28028 |
22.74 |
| 2026-08-06 00:00 |
05:54:31.69 |
+30:08:40.5 |
HIP 28028 |
18.40 |
| 2026-08-06 12:00 |
05:54:57.62 |
+30:09:28.1 |
HIP 28028 |
15.00 |
| 2026-08-07 00:00 |
05:55:23.46 |
+30:10:15.6 |
HIP 28028 |
13.27 |
| 2026-08-07 12:00 |
05:55:49.21 |
+30:11:03.1 |
HIP 28028 |
13.82 |
| 2026-08-08 00:00 |
05:56:14.85 |
+30:11:50.6 |
HIP 28028 |
16.39 |
| 2026-08-08 12:00 |
05:56:40.40 |
+30:12:38.1 |
HIP 28028 |
20.21 |
| 2026-08-09 00:00 |
05:57:05.85 |
+30:13:25.5 |
HIP 28157 |
23.19 |
| 2026-08-09 12:00 |
05:57:31.20 |
+30:14:12.9 |
HIP 28157 |
23.34 |
| 2026-08-10 00:00 |
05:57:56.44 |
+30:15:00.4 |
HIP 28309 |
20.50 |
| 2026-08-10 12:00 |
05:58:21.58 |
+30:15:47.8 |
HIP 28309 |
18.33 |
| 2026-08-11 00:00 |
05:58:46.62 |
+30:16:35.2 |
HIP 28402 |
15.73 |
| 2026-08-11 12:00 |
05:59:11.55 |
+30:17:22.6 |
HIP 28402 |
11.26 |
| 2026-08-12 00:00 |
05:59:36.38 |
+30:18:10.0 |
HIP 28402 |
8.08 |
| 2026-08-12 12:00 |
06:00:01.10 |
+30:18:57.4 |
HIP 28402 |
7.91 |
| 2026-08-13 00:00 |
06:00:25.71 |
+30:19:44.8 |
HIP 28402 |
10.85 |
| 2026-08-13 12:00 |
06:00:50.21 |
+30:20:32.3 |
HIP 28402 |
15.17 |
| 2026-08-14 00:00 |
06:01:14.60 |
+30:21:19.7 |
HIP 28402 |
19.97 |
| 2026-08-14 12:00 |
06:01:38.88 |
+30:22:07.2 |
HIP 28402 |
24.96 |
| 2026-08-15 00:00 |
06:02:03.04 |
+30:22:54.7 |
HIP 28711 |
26.40 |
| 2026-08-15 12:00 |
06:02:27.10 |
+30:23:42.2 |
HIP 28711 |
22.47 |
| 2026-08-16 00:00 |
06:02:51.03 |
+30:24:29.8 |
HIP 28711 |
19.19 |
| 2026-08-16 12:00 |
06:03:14.85 |
+30:25:17.4 |
HIP 28711 |
16.94 |
| 2026-08-17 00:00 |
06:03:38.56 |
+30:26:05.1 |
HIP 28711 |
16.13 |
| 2026-08-17 12:00 |
06:04:02.15 |
+30:26:52.7 |
HIP 28774 |
14.21 |
| 2026-08-18 00:00 |
06:04:25.62 |
+30:27:40.5 |
HIP 28774 |
13.46 |
| 2026-08-18 12:00 |
06:04:48.97 |
+30:28:28.3 |
HIP 28774 |
14.58 |
| 2026-08-19 00:00 |
06:05:12.20 |
+30:29:16.1 |
HIP 28774 |
17.20 |