メタデータ
| 項目 |
値 |
| Designation |
C/1948 E1 (Pajdusakova-Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-05-16T15:18:31.078080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
12.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1949-03-06.0000000 |
| e |
1.00093013 |
| q (au) |
2.107136 |
| a (au) |
-2265.428601 |
| i (deg) |
92.917661 |
| Ω (om, deg) |
247.655064 |
| ω (w, deg) |
66.906940 |
| M (ma, deg) |
0.002682 |
等級
散乱 + 全体線形
$$
M_a = (2.842 + 5.735\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.842 |
| n |
5.735 |
| gf |
0.996 |
| gb |
-0.682 |
| k |
0.981 |
| δ90 |
9.995 |
| 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) |
| 2026-03-26 00:00 |
04:43:41.71 |
-28:11:21.5 |
HIP 22031 |
6.91 |
| 2026-03-26 12:00 |
04:43:42.21 |
-28:11:08.7 |
HIP 22031 |
6.89 |
| 2026-03-27 00:00 |
04:43:42.72 |
-28:10:55.9 |
HIP 22031 |
6.88 |
| 2026-03-27 12:00 |
04:43:43.24 |
-28:10:43.2 |
HIP 22031 |
6.88 |
| 2026-03-28 00:00 |
04:43:43.77 |
-28:10:30.5 |
HIP 22031 |
6.88 |
| 2026-03-28 12:00 |
04:43:44.31 |
-28:10:17.8 |
HIP 22031 |
6.89 |
| 2026-03-29 00:00 |
04:43:44.86 |
-28:10:05.2 |
HIP 22031 |
6.90 |
| 2026-03-29 12:00 |
04:43:45.42 |
-28:09:52.6 |
HIP 22031 |
6.92 |
| 2026-03-30 00:00 |
04:43:45.99 |
-28:09:40.1 |
HIP 22031 |
6.95 |
| 2026-03-30 12:00 |
04:43:46.57 |
-28:09:27.6 |
HIP 22031 |
6.98 |
| 2026-03-31 00:00 |
04:43:47.16 |
-28:09:15.2 |
HIP 22031 |
7.02 |
| 2026-03-31 12:00 |
04:43:47.76 |
-28:09:02.8 |
HIP 22031 |
7.06 |
| 2026-04-01 00:00 |
04:43:48.37 |
-28:08:50.4 |
HIP 22031 |
7.11 |
| 2026-04-01 12:00 |
04:43:48.99 |
-28:08:38.1 |
HIP 22031 |
7.17 |
| 2026-04-02 00:00 |
04:43:49.62 |
-28:08:25.8 |
HIP 22031 |
7.23 |
| 2026-04-02 12:00 |
04:43:50.26 |
-28:08:13.6 |
HIP 22031 |
7.30 |
| 2026-04-03 00:00 |
04:43:50.91 |
-28:08:01.4 |
HIP 22031 |
7.38 |
| 2026-04-03 12:00 |
04:43:51.57 |
-28:07:49.3 |
HIP 22031 |
7.46 |
| 2026-04-04 00:00 |
04:43:52.24 |
-28:07:37.2 |
HIP 22031 |
7.54 |
| 2026-04-04 12:00 |
04:43:52.92 |
-28:07:25.2 |
HIP 22031 |
7.63 |
| 2026-04-05 00:00 |
04:43:53.60 |
-28:07:13.2 |
HIP 22031 |
7.73 |
| 2026-04-05 12:00 |
04:43:54.30 |
-28:07:01.3 |
HIP 22031 |
7.83 |
| 2026-04-06 00:00 |
04:43:55.01 |
-28:06:49.5 |
HIP 22031 |
7.94 |
| 2026-04-06 12:00 |
04:43:55.72 |
-28:06:37.6 |
HIP 22031 |
8.05 |
| 2026-04-07 00:00 |
04:43:56.45 |
-28:06:25.9 |
HIP 22031 |
8.16 |
| 2026-04-07 12:00 |
04:43:57.18 |
-28:06:14.2 |
HIP 22031 |
8.28 |
| 2026-04-08 00:00 |
04:43:57.93 |
-28:06:02.5 |
HIP 22031 |
8.41 |
| 2026-04-08 12:00 |
04:43:58.68 |
-28:05:51.0 |
HIP 22031 |
8.54 |
| 2026-04-09 00:00 |
04:43:59.44 |
-28:05:39.4 |
HIP 22031 |
8.67 |
| 2026-04-09 12:00 |
04:44:00.21 |
-28:05:28.0 |
HIP 22031 |
8.81 |
| 2026-04-10 00:00 |
04:44:00.99 |
-28:05:16.6 |
HIP 22031 |
8.95 |
| 2026-04-10 12:00 |
04:44:01.78 |
-28:05:05.2 |
HIP 22031 |
9.09 |
| 2026-04-11 00:00 |
04:44:02.58 |
-28:04:53.9 |
HIP 22031 |
9.24 |
| 2026-04-11 12:00 |
04:44:03.38 |
-28:04:42.7 |
HIP 22031 |
9.39 |
| 2026-04-12 00:00 |
04:44:04.20 |
-28:04:31.5 |
HIP 22046 |
9.37 |
| 2026-04-12 12:00 |
04:44:05.02 |
-28:04:20.4 |
HIP 22046 |
9.12 |
| 2026-04-13 00:00 |
04:44:05.85 |
-28:04:09.4 |
HIP 22046 |
8.86 |
| 2026-04-13 12:00 |
04:44:06.69 |
-28:03:58.4 |
HIP 22046 |
8.60 |
| 2026-04-14 00:00 |
04:44:07.54 |
-28:03:47.5 |
HIP 22046 |
8.35 |
| 2026-04-14 12:00 |
04:44:08.40 |
-28:03:36.7 |
HIP 22046 |
8.09 |
| 2026-04-15 00:00 |
04:44:09.27 |
-28:03:25.9 |
HIP 22046 |
7.84 |
| 2026-04-15 12:00 |
04:44:10.14 |
-28:03:15.2 |
HIP 22046 |
7.58 |
| 2026-04-16 00:00 |
04:44:11.02 |
-28:03:04.6 |
HIP 22046 |
7.33 |