メタデータ
| 項目 |
値 |
| Designation |
C/1971 M1 (Edwards) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1971-12-07T23:04:58.232640Z |
| Orbit solution date (soln_date, UTC) |
2023-03-26T23:42:03Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1971-07-04.0000000 |
| e |
1.00000000 |
| q (au) |
2.881429 |
| a (au) |
- |
| i (deg) |
97.149236 |
| Ω (om, deg) |
267.776204 |
| ω (w, deg) |
44.179761 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-05-12 00:00 |
05:39:28.39 |
+01:34:13.8 |
HIP 26648 |
7.00 |
| 2026-05-12 12:00 |
05:39:29.62 |
+01:34:18.5 |
HIP 26648 |
6.84 |
| 2026-05-13 00:00 |
05:39:30.85 |
+01:34:23.1 |
HIP 26648 |
6.68 |
| 2026-05-13 12:00 |
05:39:32.08 |
+01:34:27.6 |
HIP 26648 |
6.53 |
| 2026-05-14 00:00 |
05:39:33.33 |
+01:34:32.1 |
HIP 26648 |
6.39 |
| 2026-05-14 12:00 |
05:39:34.58 |
+01:34:36.5 |
HIP 26648 |
6.26 |
| 2026-05-15 00:00 |
05:39:35.83 |
+01:34:40.9 |
HIP 26648 |
6.15 |
| 2026-05-15 12:00 |
05:39:37.10 |
+01:34:45.2 |
HIP 26648 |
6.04 |
| 2026-05-16 00:00 |
05:39:38.37 |
+01:34:49.5 |
HIP 26648 |
5.96 |
| 2026-05-16 12:00 |
05:39:39.64 |
+01:34:53.7 |
HIP 26648 |
5.88 |
| 2026-05-17 00:00 |
05:39:40.93 |
+01:34:57.8 |
HIP 26648 |
5.83 |
| 2026-05-17 12:00 |
05:39:42.22 |
+01:35:01.9 |
HIP 26648 |
5.79 |
| 2026-05-18 00:00 |
05:39:43.51 |
+01:35:05.9 |
HIP 26648 |
5.76 |
| 2026-05-18 12:00 |
05:39:44.81 |
+01:35:09.9 |
HIP 26648 |
5.76 |
| 2026-05-19 00:00 |
05:39:46.12 |
+01:35:13.8 |
HIP 26648 |
5.77 |
| 2026-05-19 12:00 |
05:39:47.43 |
+01:35:17.6 |
HIP 26648 |
5.80 |
| 2026-05-20 00:00 |
05:39:48.75 |
+01:35:21.4 |
HIP 26648 |
5.85 |
| 2026-05-20 12:00 |
05:39:50.07 |
+01:35:25.1 |
HIP 26648 |
5.92 |
| 2026-05-21 00:00 |
05:39:51.40 |
+01:35:28.7 |
HIP 26648 |
6.00 |
| 2026-05-21 12:00 |
05:39:52.73 |
+01:35:32.3 |
HIP 26648 |
6.10 |
| 2026-05-22 00:00 |
05:39:54.07 |
+01:35:35.9 |
HIP 26648 |
6.22 |
| 2026-05-22 12:00 |
05:39:55.42 |
+01:35:39.3 |
HIP 26648 |
6.35 |
| 2026-05-23 00:00 |
05:39:56.77 |
+01:35:42.7 |
HIP 26648 |
6.50 |
| 2026-05-23 12:00 |
05:39:58.12 |
+01:35:46.1 |
HIP 26648 |
6.66 |
| 2026-05-24 00:00 |
05:39:59.48 |
+01:35:49.4 |
HIP 26648 |
6.83 |
| 2026-05-24 12:00 |
05:40:00.84 |
+01:35:52.6 |
HIP 26648 |
7.02 |
| 2026-05-25 00:00 |
05:40:02.21 |
+01:35:55.7 |
HIP 26648 |
7.21 |
| 2026-05-25 12:00 |
05:40:03.58 |
+01:35:58.8 |
HIP 26648 |
7.42 |
| 2026-05-26 00:00 |
05:40:04.96 |
+01:36:01.8 |
HIP 26648 |
7.64 |
| 2026-05-26 12:00 |
05:40:06.34 |
+01:36:04.8 |
HIP 26648 |
7.86 |
| 2026-05-27 00:00 |
05:40:07.73 |
+01:36:07.7 |
HIP 26648 |
8.10 |
| 2026-05-27 12:00 |
05:40:09.12 |
+01:36:10.5 |
HIP 26648 |
8.34 |
| 2026-05-28 00:00 |
05:40:10.51 |
+01:36:13.3 |
HIP 26648 |
8.59 |
| 2026-05-28 12:00 |
05:40:11.91 |
+01:36:16.0 |
HIP 26648 |
8.85 |
| 2026-05-29 00:00 |
05:40:13.31 |
+01:36:18.7 |
HIP 26648 |
9.11 |
| 2026-05-29 12:00 |
05:40:14.72 |
+01:36:21.2 |
HIP 26648 |
9.38 |
| 2026-05-30 00:00 |
05:40:16.13 |
+01:36:23.8 |
HIP 26648 |
9.65 |
| 2026-05-30 12:00 |
05:40:17.54 |
+01:36:26.2 |
HIP 26648 |
9.93 |
| 2026-05-31 00:00 |
05:40:18.95 |
+01:36:28.6 |
HIP 26648 |
10.21 |
| 2026-05-31 12:00 |
05:40:20.37 |
+01:36:30.9 |
HIP 26648 |
10.50 |
| 2026-06-01 00:00 |
05:40:21.80 |
+01:36:33.2 |
HIP 26648 |
10.79 |
| 2026-06-01 12:00 |
05:40:23.22 |
+01:36:35.3 |
HIP 26648 |
11.09 |
| 2026-06-02 00:00 |
05:40:24.65 |
+01:36:37.5 |
HIP 26648 |
11.39 |