メタデータ
| 項目 |
値 |
| Designation |
C/1981 G1 (Elias) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-08-18T09:31:39.573120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1982-01-23.0000000 |
| e |
1.00140214 |
| q (au) |
4.742646 |
| a (au) |
-3382.426552 |
| i (deg) |
115.300346 |
| Ω (om, deg) |
176.713357 |
| ω (w, deg) |
310.265581 |
| M (ma, deg) |
0.000790 |
等級
散乱 + 全体線形
$$
M_a = (1.266 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.266 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
00:43:14.33 |
+78:59:15.3 |
HIP 3380 |
12.56 |
| 2026-06-01 12:00 |
00:43:18.64 |
+78:59:36.9 |
HIP 3380 |
12.21 |
| 2026-06-02 00:00 |
00:43:22.89 |
+78:59:58.7 |
HIP 3380 |
11.87 |
| 2026-06-02 12:00 |
00:43:27.08 |
+79:00:20.5 |
HIP 3380 |
11.53 |
| 2026-06-03 00:00 |
00:43:31.22 |
+79:00:42.4 |
HIP 3380 |
11.19 |
| 2026-06-03 12:00 |
00:43:35.31 |
+79:01:04.4 |
HIP 3380 |
10.86 |
| 2026-06-04 00:00 |
00:43:39.33 |
+79:01:26.4 |
HIP 3380 |
10.53 |
| 2026-06-04 12:00 |
00:43:43.30 |
+79:01:48.6 |
HIP 3380 |
10.21 |
| 2026-06-05 00:00 |
00:43:47.20 |
+79:02:10.8 |
HIP 3380 |
9.89 |
| 2026-06-05 12:00 |
00:43:51.05 |
+79:02:33.1 |
HIP 3380 |
9.57 |
| 2026-06-06 00:00 |
00:43:54.84 |
+79:02:55.5 |
HIP 3380 |
9.26 |
| 2026-06-06 12:00 |
00:43:58.58 |
+79:03:17.9 |
HIP 3380 |
8.96 |
| 2026-06-07 00:00 |
00:44:02.25 |
+79:03:40.4 |
HIP 3380 |
8.66 |
| 2026-06-07 12:00 |
00:44:05.86 |
+79:04:03.0 |
HIP 3380 |
8.38 |
| 2026-06-08 00:00 |
00:44:09.41 |
+79:04:25.6 |
HIP 3380 |
8.10 |
| 2026-06-08 12:00 |
00:44:12.90 |
+79:04:48.4 |
HIP 3380 |
7.83 |
| 2026-06-09 00:00 |
00:44:16.33 |
+79:05:11.1 |
HIP 3380 |
7.57 |
| 2026-06-09 12:00 |
00:44:19.70 |
+79:05:34.0 |
HIP 3380 |
7.32 |
| 2026-06-10 00:00 |
00:44:23.01 |
+79:05:56.9 |
HIP 3380 |
7.08 |
| 2026-06-10 12:00 |
00:44:26.25 |
+79:06:19.9 |
HIP 3380 |
6.86 |
| 2026-06-11 00:00 |
00:44:29.43 |
+79:06:42.9 |
HIP 3380 |
6.66 |
| 2026-06-11 12:00 |
00:44:32.55 |
+79:07:06.0 |
HIP 3380 |
6.47 |
| 2026-06-12 00:00 |
00:44:35.61 |
+79:07:29.2 |
HIP 3380 |
6.30 |
| 2026-06-12 12:00 |
00:44:38.60 |
+79:07:52.4 |
HIP 3380 |
6.15 |
| 2026-06-13 00:00 |
00:44:41.53 |
+79:08:15.6 |
HIP 3380 |
6.02 |
| 2026-06-13 12:00 |
00:44:44.39 |
+79:08:38.9 |
HIP 3380 |
5.91 |
| 2026-06-14 00:00 |
00:44:47.19 |
+79:09:02.3 |
HIP 3380 |
5.83 |
| 2026-06-14 12:00 |
00:44:49.93 |
+79:09:25.7 |
HIP 3380 |
5.77 |
| 2026-06-15 00:00 |
00:44:52.60 |
+79:09:49.1 |
HIP 3380 |
5.74 |
| 2026-06-15 12:00 |
00:44:55.20 |
+79:10:12.6 |
HIP 3380 |
5.73 |
| 2026-06-16 00:00 |
00:44:57.74 |
+79:10:36.2 |
HIP 3380 |
5.75 |
| 2026-06-16 12:00 |
00:45:00.21 |
+79:10:59.8 |
HIP 3380 |
5.80 |
| 2026-06-17 00:00 |
00:45:02.61 |
+79:11:23.4 |
HIP 3380 |
5.87 |
| 2026-06-17 12:00 |
00:45:04.95 |
+79:11:47.0 |
HIP 3380 |
5.96 |
| 2026-06-18 00:00 |
00:45:07.22 |
+79:12:10.7 |
HIP 3380 |
6.08 |
| 2026-06-18 12:00 |
00:45:09.43 |
+79:12:34.5 |
HIP 3380 |
6.22 |
| 2026-06-19 00:00 |
00:45:11.56 |
+79:12:58.2 |
HIP 3380 |
6.38 |
| 2026-06-19 12:00 |
00:45:13.63 |
+79:13:22.0 |
HIP 3380 |
6.55 |
| 2026-06-20 00:00 |
00:45:15.63 |
+79:13:45.8 |
HIP 3380 |
6.75 |
| 2026-06-20 12:00 |
00:45:17.56 |
+79:14:09.7 |
HIP 3380 |
6.96 |
| 2026-06-21 00:00 |
00:45:19.43 |
+79:14:33.6 |
HIP 3380 |
7.18 |
| 2026-06-21 12:00 |
00:45:21.22 |
+79:14:57.4 |
HIP 3380 |
7.42 |
| 2026-06-22 00:00 |
00:45:22.95 |
+79:15:21.4 |
HIP 3380 |
7.67 |