メタデータ
| 項目 |
値 |
| Designation |
C/1980 R1 (Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-03-06T03:48:13.415040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1980-10-13.0000000 |
| e |
1.00182492 |
| q (au) |
2.112445 |
| a (au) |
-1157.557626 |
| i (deg) |
128.706527 |
| Ω (om, deg) |
232.786557 |
| ω (w, deg) |
297.189306 |
| M (ma, deg) |
-0.003608 |
等級
散乱 + 全体線形
$$
M_a = (10.779 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.779 |
| n |
6.000 |
| gf |
0.995 |
| gb |
-1.000 |
| 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 |
10:51:38.60 |
+64:28:56.3 |
HIP 53158 |
18.49 |
| 2026-03-26 12:00 |
10:51:35.10 |
+64:28:53.1 |
HIP 53158 |
18.66 |
| 2026-03-27 00:00 |
10:51:31.61 |
+64:28:49.7 |
HIP 53158 |
18.84 |
| 2026-03-27 12:00 |
10:51:28.14 |
+64:28:46.0 |
HIP 53158 |
19.03 |
| 2026-03-28 00:00 |
10:51:24.68 |
+64:28:42.2 |
HIP 53158 |
19.22 |
| 2026-03-28 12:00 |
10:51:21.24 |
+64:28:38.2 |
HIP 53158 |
19.43 |
| 2026-03-29 00:00 |
10:51:17.81 |
+64:28:34.0 |
HIP 53158 |
19.64 |
| 2026-03-29 12:00 |
10:51:14.40 |
+64:28:29.7 |
HIP 53158 |
19.86 |
| 2026-03-30 00:00 |
10:51:11.00 |
+64:28:25.1 |
HIP 53158 |
20.08 |
| 2026-03-30 12:00 |
10:51:07.62 |
+64:28:20.3 |
HIP 53158 |
20.31 |
| 2026-03-31 00:00 |
10:51:04.25 |
+64:28:15.4 |
HIP 53158 |
20.55 |
| 2026-03-31 12:00 |
10:51:00.90 |
+64:28:10.2 |
HIP 53158 |
20.79 |
| 2026-04-01 00:00 |
10:50:57.57 |
+64:28:04.9 |
HIP 53158 |
21.04 |
| 2026-04-01 12:00 |
10:50:54.25 |
+64:27:59.4 |
HIP 53158 |
21.29 |
| 2026-04-02 00:00 |
10:50:50.95 |
+64:27:53.7 |
HIP 53158 |
21.55 |
| 2026-04-02 12:00 |
10:50:47.67 |
+64:27:47.8 |
HIP 52790 |
21.50 |
| 2026-04-03 00:00 |
10:50:44.40 |
+64:27:41.7 |
HIP 52790 |
21.14 |
| 2026-04-03 12:00 |
10:50:41.15 |
+64:27:35.5 |
HIP 52790 |
20.77 |
| 2026-04-04 00:00 |
10:50:37.92 |
+64:27:29.0 |
HIP 52790 |
20.41 |
| 2026-04-04 12:00 |
10:50:34.71 |
+64:27:22.4 |
HIP 52790 |
20.05 |
| 2026-04-05 00:00 |
10:50:31.51 |
+64:27:15.6 |
HIP 52790 |
19.68 |
| 2026-04-05 12:00 |
10:50:28.34 |
+64:27:08.6 |
HIP 52790 |
19.32 |
| 2026-04-06 00:00 |
10:50:25.18 |
+64:27:01.5 |
HIP 52790 |
18.97 |
| 2026-04-06 12:00 |
10:50:22.04 |
+64:26:54.1 |
HIP 52790 |
18.61 |
| 2026-04-07 00:00 |
10:50:18.92 |
+64:26:46.6 |
HIP 52790 |
18.25 |
| 2026-04-07 12:00 |
10:50:15.82 |
+64:26:38.9 |
HIP 52790 |
17.90 |
| 2026-04-08 00:00 |
10:50:12.74 |
+64:26:31.0 |
HIP 52790 |
17.55 |
| 2026-04-08 12:00 |
10:50:09.68 |
+64:26:22.9 |
HIP 52790 |
17.20 |
| 2026-04-09 00:00 |
10:50:06.64 |
+64:26:14.7 |
HIP 52790 |
16.85 |
| 2026-04-09 12:00 |
10:50:03.61 |
+64:26:06.3 |
HIP 52790 |
16.50 |
| 2026-04-10 00:00 |
10:50:00.61 |
+64:25:57.7 |
HIP 52790 |
16.16 |
| 2026-04-10 12:00 |
10:49:57.63 |
+64:25:48.9 |
HIP 52790 |
15.82 |
| 2026-04-11 00:00 |
10:49:54.67 |
+64:25:40.0 |
HIP 52790 |
15.47 |
| 2026-04-11 12:00 |
10:49:51.73 |
+64:25:30.9 |
HIP 52790 |
15.14 |
| 2026-04-12 00:00 |
10:49:48.82 |
+64:25:21.6 |
HIP 52790 |
14.80 |
| 2026-04-12 12:00 |
10:49:45.92 |
+64:25:12.1 |
HIP 52790 |
14.47 |
| 2026-04-13 00:00 |
10:49:43.05 |
+64:25:02.5 |
HIP 52790 |
14.14 |
| 2026-04-13 12:00 |
10:49:40.20 |
+64:24:52.7 |
HIP 52790 |
13.81 |
| 2026-04-14 00:00 |
10:49:37.37 |
+64:24:42.7 |
HIP 52790 |
13.48 |
| 2026-04-14 12:00 |
10:49:34.56 |
+64:24:32.6 |
HIP 52790 |
13.16 |
| 2026-04-15 00:00 |
10:49:31.77 |
+64:24:22.3 |
HIP 52790 |
12.84 |
| 2026-04-15 12:00 |
10:49:29.01 |
+64:24:11.8 |
HIP 52790 |
12.53 |
| 2026-04-16 00:00 |
10:49:26.27 |
+64:24:01.2 |
HIP 52790 |
12.22 |