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) |
| 2026-07-29 00:00 |
00:44:08.42 |
+79:43:53.9 |
HIP 4090 |
23.13 |
| 2026-07-29 12:00 |
00:44:04.60 |
+79:44:14.6 |
HIP 4090 |
23.19 |
| 2026-07-30 00:00 |
00:44:00.72 |
+79:44:35.2 |
HIP 4090 |
23.27 |
| 2026-07-30 12:00 |
00:43:56.75 |
+79:44:55.6 |
HIP 4090 |
23.35 |
| 2026-07-31 00:00 |
00:43:52.72 |
+79:45:16.0 |
HIP 4090 |
23.44 |
| 2026-07-31 12:00 |
00:43:48.61 |
+79:45:36.3 |
HIP 4090 |
23.54 |
| 2026-08-01 00:00 |
00:43:44.43 |
+79:45:56.4 |
HIP 4090 |
23.65 |
| 2026-08-01 12:00 |
00:43:40.18 |
+79:46:16.4 |
HIP 4090 |
23.76 |
| 2026-08-02 00:00 |
00:43:35.85 |
+79:46:36.4 |
HIP 4090 |
23.89 |
| 2026-08-02 12:00 |
00:43:31.45 |
+79:46:56.1 |
HIP 4090 |
24.03 |
| 2026-08-03 00:00 |
00:43:26.98 |
+79:47:15.8 |
HIP 4090 |
24.17 |
| 2026-08-03 12:00 |
00:43:22.43 |
+79:47:35.4 |
HIP 4090 |
24.32 |
| 2026-08-04 00:00 |
00:43:17.82 |
+79:47:54.8 |
HIP 4090 |
24.49 |
| 2026-08-04 12:00 |
00:43:13.13 |
+79:48:14.1 |
HIP 4090 |
24.65 |
| 2026-08-05 00:00 |
00:43:08.37 |
+79:48:33.2 |
HIP 4090 |
24.83 |
| 2026-08-05 12:00 |
00:43:03.54 |
+79:48:52.3 |
HIP 2971 |
24.69 |
| 2026-08-06 00:00 |
00:42:58.63 |
+79:49:11.2 |
HIP 2971 |
24.31 |
| 2026-08-06 12:00 |
00:42:53.66 |
+79:49:29.9 |
HIP 2971 |
23.93 |
| 2026-08-07 00:00 |
00:42:48.61 |
+79:49:48.6 |
HIP 2971 |
23.55 |
| 2026-08-07 12:00 |
00:42:43.50 |
+79:50:07.1 |
HIP 2971 |
23.17 |
| 2026-08-08 00:00 |
00:42:38.31 |
+79:50:25.4 |
HIP 2971 |
22.78 |
| 2026-08-08 12:00 |
00:42:33.05 |
+79:50:43.7 |
HIP 2971 |
22.40 |
| 2026-08-09 00:00 |
00:42:27.73 |
+79:51:01.7 |
HIP 2971 |
22.02 |
| 2026-08-09 12:00 |
00:42:22.33 |
+79:51:19.7 |
HIP 2971 |
21.64 |
| 2026-08-10 00:00 |
00:42:16.87 |
+79:51:37.5 |
HIP 2971 |
21.27 |
| 2026-08-10 12:00 |
00:42:11.33 |
+79:51:55.1 |
HIP 2971 |
20.89 |
| 2026-08-11 00:00 |
00:42:05.73 |
+79:52:12.6 |
HIP 2971 |
20.51 |
| 2026-08-11 12:00 |
00:42:00.06 |
+79:52:29.9 |
HIP 2971 |
20.13 |
| 2026-08-12 00:00 |
00:41:54.32 |
+79:52:47.1 |
HIP 2971 |
19.75 |
| 2026-08-12 12:00 |
00:41:48.51 |
+79:53:04.1 |
HIP 2971 |
19.38 |
| 2026-08-13 00:00 |
00:41:42.63 |
+79:53:21.0 |
HIP 2971 |
19.00 |
| 2026-08-13 12:00 |
00:41:36.69 |
+79:53:37.7 |
HIP 2971 |
18.63 |
| 2026-08-14 00:00 |
00:41:30.68 |
+79:53:54.3 |
HIP 2971 |
18.26 |
| 2026-08-14 12:00 |
00:41:24.61 |
+79:54:10.7 |
HIP 2971 |
17.89 |
| 2026-08-15 00:00 |
00:41:18.47 |
+79:54:26.9 |
HIP 2971 |
17.52 |
| 2026-08-15 12:00 |
00:41:12.26 |
+79:54:43.0 |
HIP 2971 |
17.15 |
| 2026-08-16 00:00 |
00:41:05.99 |
+79:54:58.9 |
HIP 2971 |
16.78 |
| 2026-08-16 12:00 |
00:40:59.66 |
+79:55:14.7 |
HIP 2971 |
16.42 |
| 2026-08-17 00:00 |
00:40:53.26 |
+79:55:30.2 |
HIP 2971 |
16.05 |
| 2026-08-17 12:00 |
00:40:46.80 |
+79:55:45.6 |
HIP 2971 |
15.69 |
| 2026-08-18 00:00 |
00:40:40.28 |
+79:56:00.9 |
HIP 2971 |
15.33 |
| 2026-08-18 12:00 |
00:40:33.69 |
+79:56:15.9 |
HIP 2971 |
14.98 |
| 2026-08-19 00:00 |
00:40:27.04 |
+79:56:30.8 |
HIP 2971 |
14.62 |