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) |
| 2026-07-29 00:00 |
05:43:02.75 |
+01:33:11.2 |
HIP 26937 |
3.76 |
| 2026-07-29 12:00 |
05:43:03.88 |
+01:33:05.7 |
HIP 26937 |
3.75 |
| 2026-07-30 00:00 |
05:43:05.00 |
+01:33:00.1 |
HIP 26937 |
3.75 |
| 2026-07-30 12:00 |
05:43:06.11 |
+01:32:54.4 |
HIP 26937 |
3.78 |
| 2026-07-31 00:00 |
05:43:07.22 |
+01:32:48.6 |
HIP 26937 |
3.83 |
| 2026-07-31 12:00 |
05:43:08.31 |
+01:32:42.8 |
HIP 26937 |
3.89 |
| 2026-08-01 00:00 |
05:43:09.40 |
+01:32:37.0 |
HIP 26937 |
3.98 |
| 2026-08-01 12:00 |
05:43:10.48 |
+01:32:31.1 |
HIP 26937 |
4.08 |
| 2026-08-02 00:00 |
05:43:11.56 |
+01:32:25.1 |
HIP 26937 |
4.19 |
| 2026-08-02 12:00 |
05:43:12.62 |
+01:32:19.1 |
HIP 26937 |
4.32 |
| 2026-08-03 00:00 |
05:43:13.67 |
+01:32:13.0 |
HIP 26937 |
4.47 |
| 2026-08-03 12:00 |
05:43:14.72 |
+01:32:06.9 |
HIP 26937 |
4.62 |
| 2026-08-04 00:00 |
05:43:15.76 |
+01:32:00.7 |
HIP 26937 |
4.78 |
| 2026-08-04 12:00 |
05:43:16.79 |
+01:31:54.5 |
HIP 26937 |
4.95 |
| 2026-08-05 00:00 |
05:43:17.81 |
+01:31:48.2 |
HIP 26937 |
5.13 |
| 2026-08-05 12:00 |
05:43:18.82 |
+01:31:41.9 |
HIP 26937 |
5.31 |
| 2026-08-06 00:00 |
05:43:19.82 |
+01:31:35.5 |
HIP 26937 |
5.50 |
| 2026-08-06 12:00 |
05:43:20.81 |
+01:31:29.0 |
HIP 26937 |
5.69 |
| 2026-08-07 00:00 |
05:43:21.80 |
+01:31:22.5 |
HIP 26937 |
5.89 |
| 2026-08-07 12:00 |
05:43:22.77 |
+01:31:16.0 |
HIP 26937 |
6.09 |
| 2026-08-08 00:00 |
05:43:23.74 |
+01:31:09.4 |
HIP 26937 |
6.29 |
| 2026-08-08 12:00 |
05:43:24.70 |
+01:31:02.7 |
HIP 26937 |
6.49 |
| 2026-08-09 00:00 |
05:43:25.64 |
+01:30:56.0 |
HIP 26937 |
6.70 |
| 2026-08-09 12:00 |
05:43:26.58 |
+01:30:49.3 |
HIP 26937 |
6.91 |
| 2026-08-10 00:00 |
05:43:27.51 |
+01:30:42.4 |
HIP 26937 |
7.11 |
| 2026-08-10 12:00 |
05:43:28.42 |
+01:30:35.6 |
HIP 26937 |
7.32 |
| 2026-08-11 00:00 |
05:43:29.33 |
+01:30:28.7 |
HIP 26937 |
7.53 |
| 2026-08-11 12:00 |
05:43:30.23 |
+01:30:21.7 |
HIP 26937 |
7.74 |
| 2026-08-12 00:00 |
05:43:31.12 |
+01:30:14.7 |
HIP 26937 |
7.95 |
| 2026-08-12 12:00 |
05:43:32.00 |
+01:30:07.7 |
HIP 26937 |
8.16 |
| 2026-08-13 00:00 |
05:43:32.87 |
+01:30:00.6 |
HIP 27033 |
8.16 |
| 2026-08-13 12:00 |
05:43:33.72 |
+01:29:53.4 |
HIP 27033 |
7.92 |
| 2026-08-14 00:00 |
05:43:34.57 |
+01:29:46.2 |
HIP 27033 |
7.67 |
| 2026-08-14 12:00 |
05:43:35.41 |
+01:29:39.0 |
HIP 27033 |
7.43 |
| 2026-08-15 00:00 |
05:43:36.24 |
+01:29:31.7 |
HIP 27033 |
7.19 |
| 2026-08-15 12:00 |
05:43:37.05 |
+01:29:24.4 |
HIP 27033 |
6.96 |
| 2026-08-16 00:00 |
05:43:37.86 |
+01:29:17.0 |
HIP 27033 |
6.72 |
| 2026-08-16 12:00 |
05:43:38.66 |
+01:29:09.6 |
HIP 27033 |
6.49 |
| 2026-08-17 00:00 |
05:43:39.44 |
+01:29:02.1 |
HIP 27033 |
6.26 |
| 2026-08-17 12:00 |
05:43:40.22 |
+01:28:54.6 |
HIP 27033 |
6.03 |
| 2026-08-18 00:00 |
05:43:40.98 |
+01:28:47.1 |
HIP 27033 |
5.80 |
| 2026-08-18 12:00 |
05:43:41.73 |
+01:28:39.5 |
HIP 27033 |
5.57 |
| 2026-08-19 00:00 |
05:43:42.48 |
+01:28:31.8 |
HIP 27033 |
5.35 |