メタデータ
| 項目 |
値 |
| Designation |
126P/IRAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-05T08:31:56.219520Z |
| Orbit solution date (soln_date, UTC) |
2025-10-30T09:34:36Z |
| Obs used |
1717 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
11.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-05-27.0000000 |
| e |
0.69627539 |
| q (au) |
1.713008 |
| a (au) |
5.640004 |
| i (deg) |
45.869371 |
| Ω (om, deg) |
357.862226 |
| ω (w, deg) |
356.523683 |
| M (ma, deg) |
303.387535 |
等級
散乱 + 全体線形
$$
M_a = (10.785 + 5.260\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.785 |
| n |
5.260 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.992 |
| 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) |
| 2026-05-12 00:00 |
10:22:05.18 |
+36:27:25.4 |
HIP 50746 |
6.24 |
| 2026-05-12 12:00 |
10:22:03.78 |
+36:25:02.6 |
HIP 50746 |
7.97 |
| 2026-05-13 00:00 |
10:22:02.53 |
+36:22:39.4 |
HIP 50746 |
10.00 |
| 2026-05-13 12:00 |
10:22:01.45 |
+36:20:15.6 |
HIP 50746 |
12.18 |
| 2026-05-14 00:00 |
10:22:00.53 |
+36:17:51.4 |
HIP 50746 |
14.45 |
| 2026-05-14 12:00 |
10:21:59.77 |
+36:15:26.7 |
HIP 50746 |
16.77 |
| 2026-05-15 00:00 |
10:21:59.18 |
+36:13:01.5 |
HIP 50746 |
19.13 |
| 2026-05-15 12:00 |
10:21:58.75 |
+36:10:35.9 |
HIP 50746 |
21.51 |
| 2026-05-16 00:00 |
10:21:58.47 |
+36:08:09.9 |
HIP 50746 |
23.92 |
| 2026-05-16 12:00 |
10:21:58.36 |
+36:05:43.4 |
HIP 50746 |
26.34 |
| 2026-05-17 00:00 |
10:21:58.41 |
+36:03:16.5 |
HIP 50746 |
28.78 |
| 2026-05-17 12:00 |
10:21:58.61 |
+36:00:49.2 |
HIP 50746 |
31.22 |
| 2026-05-18 00:00 |
10:21:58.97 |
+35:58:21.4 |
HIP 50746 |
33.68 |
| 2026-05-18 12:00 |
10:21:59.49 |
+35:55:53.3 |
HIP 50746 |
36.15 |
| 2026-05-19 00:00 |
10:22:00.17 |
+35:53:24.8 |
HIP 50746 |
38.63 |
| 2026-05-19 12:00 |
10:22:01.00 |
+35:50:55.9 |
HIP 50857 |
40.07 |
| 2026-05-20 00:00 |
10:22:01.99 |
+35:48:26.6 |
HIP 50857 |
37.66 |
| 2026-05-20 12:00 |
10:22:03.13 |
+35:45:57.0 |
HIP 50857 |
35.24 |
| 2026-05-21 00:00 |
10:22:04.43 |
+35:43:27.0 |
HIP 50857 |
32.82 |
| 2026-05-21 12:00 |
10:22:05.87 |
+35:40:56.7 |
HIP 50857 |
30.40 |
| 2026-05-22 00:00 |
10:22:07.47 |
+35:38:26.0 |
HIP 50857 |
27.98 |
| 2026-05-22 12:00 |
10:22:09.22 |
+35:35:55.0 |
HIP 50857 |
25.56 |
| 2026-05-23 00:00 |
10:22:11.12 |
+35:33:23.7 |
HIP 50857 |
23.14 |
| 2026-05-23 12:00 |
10:22:13.16 |
+35:30:52.1 |
HIP 50857 |
20.74 |
| 2026-05-24 00:00 |
10:22:15.36 |
+35:28:20.2 |
HIP 50857 |
18.36 |
| 2026-05-24 12:00 |
10:22:17.70 |
+35:25:48.0 |
HIP 50857 |
16.02 |
| 2026-05-25 00:00 |
10:22:20.18 |
+35:23:15.5 |
HIP 50857 |
13.74 |
| 2026-05-25 12:00 |
10:22:22.82 |
+35:20:42.7 |
HIP 50857 |
11.57 |
| 2026-05-26 00:00 |
10:22:25.59 |
+35:18:09.7 |
HIP 50857 |
9.58 |
| 2026-05-26 12:00 |
10:22:28.51 |
+35:15:36.4 |
HIP 50857 |
7.94 |
| 2026-05-27 00:00 |
10:22:31.57 |
+35:13:02.8 |
HIP 50857 |
6.89 |
| 2026-05-27 12:00 |
10:22:34.78 |
+35:10:29.0 |
HIP 50857 |
6.75 |
| 2026-05-28 00:00 |
10:22:38.12 |
+35:07:54.9 |
HIP 50857 |
7.57 |
| 2026-05-28 12:00 |
10:22:41.61 |
+35:05:20.6 |
HIP 50857 |
9.11 |
| 2026-05-29 00:00 |
10:22:45.23 |
+35:02:46.1 |
HIP 50857 |
11.08 |
| 2026-05-29 12:00 |
10:22:48.99 |
+35:00:11.3 |
HIP 50857 |
13.30 |
| 2026-05-30 00:00 |
10:22:52.89 |
+34:57:36.4 |
HIP 50857 |
15.66 |
| 2026-05-30 12:00 |
10:22:56.92 |
+34:55:01.2 |
HIP 50857 |
18.12 |
| 2026-05-31 00:00 |
10:23:01.09 |
+34:52:25.8 |
HIP 50857 |
20.65 |
| 2026-05-31 12:00 |
10:23:05.40 |
+34:49:50.2 |
HIP 50968 |
21.82 |
| 2026-06-01 00:00 |
10:23:09.84 |
+34:47:14.5 |
HIP 50968 |
22.44 |
| 2026-06-01 12:00 |
10:23:14.41 |
+34:44:38.5 |
HIP 50968 |
23.36 |
| 2026-06-02 00:00 |
10:23:19.11 |
+34:42:02.4 |
HIP 50968 |
24.54 |