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 |
0.999 |
| 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) |
| 2026-09-20 00:00 |
04:48:35.42 |
-28:24:28.8 |
HIP 22320 |
1.70 |
| 2026-09-20 12:00 |
04:48:35.10 |
-28:24:42.7 |
HIP 22320 |
1.56 |
| 2026-09-21 00:00 |
04:48:34.76 |
-28:24:56.5 |
HIP 22320 |
1.43 |
| 2026-09-21 12:00 |
04:48:34.41 |
-28:25:10.4 |
HIP 22320 |
1.34 |
| 2026-09-22 00:00 |
04:48:34.06 |
-28:25:24.2 |
HIP 22320 |
1.28 |
| 2026-09-22 12:00 |
04:48:33.69 |
-28:25:38.0 |
HIP 22320 |
1.27 |
| 2026-09-23 00:00 |
04:48:33.31 |
-28:25:51.8 |
HIP 22320 |
1.30 |
| 2026-09-23 12:00 |
04:48:32.92 |
-28:26:05.6 |
HIP 22320 |
1.37 |
| 2026-09-24 00:00 |
04:48:32.51 |
-28:26:19.3 |
HIP 22320 |
1.48 |
| 2026-09-24 12:00 |
04:48:32.10 |
-28:26:33.0 |
HIP 22320 |
1.61 |
| 2026-09-25 00:00 |
04:48:31.68 |
-28:26:46.7 |
HIP 22320 |
1.77 |
| 2026-09-25 12:00 |
04:48:31.24 |
-28:27:00.4 |
HIP 22320 |
1.95 |
| 2026-09-26 00:00 |
04:48:30.80 |
-28:27:14.0 |
HIP 22320 |
2.14 |
| 2026-09-26 12:00 |
04:48:30.34 |
-28:27:27.7 |
HIP 22320 |
2.34 |
| 2026-09-27 00:00 |
04:48:29.88 |
-28:27:41.3 |
HIP 22320 |
2.55 |
| 2026-09-27 12:00 |
04:48:29.40 |
-28:27:54.8 |
HIP 22320 |
2.76 |
| 2026-09-28 00:00 |
04:48:28.91 |
-28:28:08.4 |
HIP 22320 |
2.98 |
| 2026-09-28 12:00 |
04:48:28.41 |
-28:28:21.9 |
HIP 22320 |
3.20 |
| 2026-09-29 00:00 |
04:48:27.91 |
-28:28:35.4 |
HIP 22320 |
3.43 |
| 2026-09-29 12:00 |
04:48:27.39 |
-28:28:48.8 |
HIP 22320 |
3.65 |
| 2026-09-30 00:00 |
04:48:26.86 |
-28:29:02.2 |
HIP 22320 |
3.89 |
| 2026-09-30 12:00 |
04:48:26.32 |
-28:29:15.6 |
HIP 22320 |
4.12 |
| 2026-10-01 00:00 |
04:48:25.76 |
-28:29:29.0 |
HIP 22320 |
4.35 |
| 2026-10-01 12:00 |
04:48:25.20 |
-28:29:42.3 |
HIP 22320 |
4.59 |
| 2026-10-02 00:00 |
04:48:24.63 |
-28:29:55.5 |
HIP 22320 |
4.83 |
| 2026-10-02 12:00 |
04:48:24.05 |
-28:30:08.8 |
HIP 22320 |
5.07 |
| 2026-10-03 00:00 |
04:48:23.45 |
-28:30:22.0 |
HIP 22320 |
5.31 |
| 2026-10-03 12:00 |
04:48:22.85 |
-28:30:35.1 |
HIP 22320 |
5.55 |
| 2026-10-04 00:00 |
04:48:22.24 |
-28:30:48.2 |
HIP 22320 |
5.80 |
| 2026-10-04 12:00 |
04:48:21.61 |
-28:31:01.3 |
HIP 22320 |
6.04 |
| 2026-10-05 00:00 |
04:48:20.98 |
-28:31:14.4 |
HIP 22320 |
6.29 |
| 2026-10-05 12:00 |
04:48:20.34 |
-28:31:27.3 |
HIP 22320 |
6.53 |
| 2026-10-06 00:00 |
04:48:19.68 |
-28:31:40.3 |
HIP 22320 |
6.78 |
| 2026-10-06 12:00 |
04:48:19.02 |
-28:31:53.2 |
HIP 22320 |
7.03 |
| 2026-10-07 00:00 |
04:48:18.34 |
-28:32:06.0 |
HIP 22320 |
7.27 |
| 2026-10-07 12:00 |
04:48:17.66 |
-28:32:18.8 |
HIP 22320 |
7.52 |
| 2026-10-08 00:00 |
04:48:16.96 |
-28:32:31.6 |
HIP 22320 |
7.77 |
| 2026-10-08 12:00 |
04:48:16.26 |
-28:32:44.3 |
HIP 22320 |
8.02 |
| 2026-10-09 00:00 |
04:48:15.54 |
-28:32:57.0 |
HIP 22320 |
8.28 |
| 2026-10-09 12:00 |
04:48:14.82 |
-28:33:09.6 |
HIP 22320 |
8.53 |
| 2026-10-10 00:00 |
04:48:14.08 |
-28:33:22.1 |
HIP 22320 |
8.78 |
| 2026-10-10 12:00 |
04:48:13.34 |
-28:33:34.6 |
HIP 22320 |
9.03 |
| 2026-10-11 00:00 |
04:48:12.58 |
-28:33:47.0 |
HIP 22320 |
9.29 |