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) |
| 2026-09-25 00:00 |
05:44:04.46 |
+01:17:47.2 |
HIP 27033 |
8.39 |
| 2026-09-25 12:00 |
05:44:04.28 |
+01:17:38.0 |
HIP 27033 |
8.54 |
| 2026-09-26 00:00 |
05:44:04.09 |
+01:17:28.7 |
HIP 27033 |
8.69 |
| 2026-09-26 12:00 |
05:44:03.89 |
+01:17:19.5 |
HIP 27033 |
8.84 |
| 2026-09-27 00:00 |
05:44:03.67 |
+01:17:10.2 |
HIP 27033 |
8.99 |
| 2026-09-27 12:00 |
05:44:03.45 |
+01:17:01.0 |
HIP 27033 |
9.14 |
| 2026-09-28 00:00 |
05:44:03.20 |
+01:16:51.7 |
HIP 27033 |
9.29 |
| 2026-09-28 12:00 |
05:44:02.95 |
+01:16:42.5 |
HIP 27033 |
9.44 |
| 2026-09-29 00:00 |
05:44:02.68 |
+01:16:33.3 |
HIP 27033 |
9.60 |
| 2026-09-29 12:00 |
05:44:02.40 |
+01:16:24.0 |
HIP 27033 |
9.75 |
| 2026-09-30 00:00 |
05:44:02.11 |
+01:16:14.8 |
HIP 27033 |
9.90 |
| 2026-09-30 12:00 |
05:44:01.81 |
+01:16:05.6 |
HIP 27033 |
10.05 |
| 2026-10-01 00:00 |
05:44:01.49 |
+01:15:56.4 |
HIP 27033 |
10.21 |
| 2026-10-01 12:00 |
05:44:01.16 |
+01:15:47.2 |
HIP 27033 |
10.36 |
| 2026-10-02 00:00 |
05:44:00.81 |
+01:15:38.0 |
HIP 27033 |
10.52 |
| 2026-10-02 12:00 |
05:44:00.46 |
+01:15:28.8 |
HIP 27033 |
10.67 |
| 2026-10-03 00:00 |
05:44:00.09 |
+01:15:19.6 |
HIP 27033 |
10.83 |
| 2026-10-03 12:00 |
05:43:59.71 |
+01:15:10.4 |
HIP 27033 |
10.98 |
| 2026-10-04 00:00 |
05:43:59.31 |
+01:15:01.3 |
HIP 27033 |
11.14 |
| 2026-10-04 12:00 |
05:43:58.90 |
+01:14:52.1 |
HIP 27033 |
11.30 |
| 2026-10-05 00:00 |
05:43:58.48 |
+01:14:43.0 |
HIP 27033 |
11.46 |
| 2026-10-05 12:00 |
05:43:58.05 |
+01:14:33.9 |
HIP 27013 |
11.61 |
| 2026-10-06 00:00 |
05:43:57.60 |
+01:14:24.8 |
HIP 27013 |
11.43 |
| 2026-10-06 12:00 |
05:43:57.15 |
+01:14:15.7 |
HIP 27013 |
11.26 |
| 2026-10-07 00:00 |
05:43:56.67 |
+01:14:06.6 |
HIP 27013 |
11.09 |
| 2026-10-07 12:00 |
05:43:56.19 |
+01:13:57.5 |
HIP 27013 |
10.92 |
| 2026-10-08 00:00 |
05:43:55.69 |
+01:13:48.5 |
HIP 27013 |
10.75 |
| 2026-10-08 12:00 |
05:43:55.19 |
+01:13:39.5 |
HIP 27013 |
10.58 |
| 2026-10-09 00:00 |
05:43:54.66 |
+01:13:30.4 |
HIP 27013 |
10.41 |
| 2026-10-09 12:00 |
05:43:54.13 |
+01:13:21.4 |
HIP 27013 |
10.24 |
| 2026-10-10 00:00 |
05:43:53.58 |
+01:13:12.5 |
HIP 27013 |
10.07 |
| 2026-10-10 12:00 |
05:43:53.02 |
+01:13:03.5 |
HIP 27013 |
9.91 |
| 2026-10-11 00:00 |
05:43:52.45 |
+01:12:54.6 |
HIP 27013 |
9.74 |
| 2026-10-11 12:00 |
05:43:51.87 |
+01:12:45.6 |
HIP 27013 |
9.58 |
| 2026-10-12 00:00 |
05:43:51.27 |
+01:12:36.8 |
HIP 27013 |
9.42 |
| 2026-10-12 12:00 |
05:43:50.66 |
+01:12:27.9 |
HIP 27013 |
9.26 |
| 2026-10-13 00:00 |
05:43:50.04 |
+01:12:19.0 |
HIP 27013 |
9.10 |
| 2026-10-13 12:00 |
05:43:49.41 |
+01:12:10.2 |
HIP 27013 |
8.95 |
| 2026-10-14 00:00 |
05:43:48.76 |
+01:12:01.4 |
HIP 27013 |
8.79 |
| 2026-10-14 12:00 |
05:43:48.10 |
+01:11:52.6 |
HIP 27013 |
8.65 |
| 2026-10-15 00:00 |
05:43:47.43 |
+01:11:43.9 |
HIP 27013 |
8.50 |
| 2026-10-15 12:00 |
05:43:46.75 |
+01:11:35.1 |
HIP 27013 |
8.36 |
| 2026-10-16 00:00 |
05:43:46.06 |
+01:11:26.4 |
HIP 27013 |
8.23 |