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) |
| 2026-07-29 00:00 |
04:48:08.00 |
-28:01:48.3 |
HIP 22192 |
22.82 |
| 2026-07-29 12:00 |
04:48:08.79 |
-28:01:58.4 |
HIP 22192 |
22.97 |
| 2026-07-30 00:00 |
04:48:09.57 |
-28:02:08.6 |
HIP 22192 |
23.11 |
| 2026-07-30 12:00 |
04:48:10.34 |
-28:02:19.0 |
HIP 22320 |
23.19 |
| 2026-07-31 00:00 |
04:48:11.10 |
-28:02:29.3 |
HIP 22320 |
22.99 |
| 2026-07-31 12:00 |
04:48:11.85 |
-28:02:39.8 |
HIP 22320 |
22.79 |
| 2026-08-01 00:00 |
04:48:12.59 |
-28:02:50.4 |
HIP 22320 |
22.59 |
| 2026-08-01 12:00 |
04:48:13.33 |
-28:03:01.0 |
HIP 22320 |
22.39 |
| 2026-08-02 00:00 |
04:48:14.05 |
-28:03:11.7 |
HIP 22320 |
22.19 |
| 2026-08-02 12:00 |
04:48:14.77 |
-28:03:22.4 |
HIP 22320 |
22.00 |
| 2026-08-03 00:00 |
04:48:15.48 |
-28:03:33.3 |
HIP 22320 |
21.80 |
| 2026-08-03 12:00 |
04:48:16.18 |
-28:03:44.2 |
HIP 22320 |
21.60 |
| 2026-08-04 00:00 |
04:48:16.87 |
-28:03:55.1 |
HIP 22320 |
21.40 |
| 2026-08-04 12:00 |
04:48:17.55 |
-28:04:06.2 |
HIP 22320 |
21.20 |
| 2026-08-05 00:00 |
04:48:18.22 |
-28:04:17.3 |
HIP 22320 |
21.00 |
| 2026-08-05 12:00 |
04:48:18.88 |
-28:04:28.5 |
HIP 22320 |
20.79 |
| 2026-08-06 00:00 |
04:48:19.53 |
-28:04:39.8 |
HIP 22320 |
20.59 |
| 2026-08-06 12:00 |
04:48:20.18 |
-28:04:51.1 |
HIP 22320 |
20.39 |
| 2026-08-07 00:00 |
04:48:20.81 |
-28:05:02.5 |
HIP 22320 |
20.19 |
| 2026-08-07 12:00 |
04:48:21.43 |
-28:05:13.9 |
HIP 22320 |
19.99 |
| 2026-08-08 00:00 |
04:48:22.05 |
-28:05:25.5 |
HIP 22320 |
19.79 |
| 2026-08-08 12:00 |
04:48:22.65 |
-28:05:37.1 |
HIP 22320 |
19.59 |
| 2026-08-09 00:00 |
04:48:23.25 |
-28:05:48.7 |
HIP 22320 |
19.39 |
| 2026-08-09 12:00 |
04:48:23.83 |
-28:06:00.4 |
HIP 22320 |
19.18 |
| 2026-08-10 00:00 |
04:48:24.41 |
-28:06:12.2 |
HIP 22320 |
18.98 |
| 2026-08-10 12:00 |
04:48:24.97 |
-28:06:24.1 |
HIP 22320 |
18.78 |
| 2026-08-11 00:00 |
04:48:25.53 |
-28:06:36.0 |
HIP 22320 |
18.58 |
| 2026-08-11 12:00 |
04:48:26.08 |
-28:06:47.9 |
HIP 22320 |
18.37 |
| 2026-08-12 00:00 |
04:48:26.61 |
-28:07:00.0 |
HIP 22320 |
18.17 |
| 2026-08-12 12:00 |
04:48:27.14 |
-28:07:12.1 |
HIP 22320 |
17.97 |
| 2026-08-13 00:00 |
04:48:27.65 |
-28:07:24.2 |
HIP 22320 |
17.76 |
| 2026-08-13 12:00 |
04:48:28.16 |
-28:07:36.4 |
HIP 22320 |
17.56 |
| 2026-08-14 00:00 |
04:48:28.66 |
-28:07:48.7 |
HIP 22320 |
17.35 |
| 2026-08-14 12:00 |
04:48:29.14 |
-28:08:01.0 |
HIP 22320 |
17.15 |
| 2026-08-15 00:00 |
04:48:29.62 |
-28:08:13.4 |
HIP 22320 |
16.94 |
| 2026-08-15 12:00 |
04:48:30.08 |
-28:08:25.8 |
HIP 22320 |
16.74 |
| 2026-08-16 00:00 |
04:48:30.54 |
-28:08:38.3 |
HIP 22320 |
16.53 |
| 2026-08-16 12:00 |
04:48:30.98 |
-28:08:50.8 |
HIP 22320 |
16.33 |
| 2026-08-17 00:00 |
04:48:31.42 |
-28:09:03.4 |
HIP 22320 |
16.12 |
| 2026-08-17 12:00 |
04:48:31.84 |
-28:09:16.0 |
HIP 22320 |
15.92 |
| 2026-08-18 00:00 |
04:48:32.25 |
-28:09:28.7 |
HIP 22320 |
15.71 |
| 2026-08-18 12:00 |
04:48:32.65 |
-28:09:41.4 |
HIP 22320 |
15.50 |
| 2026-08-19 00:00 |
04:48:33.05 |
-28:09:54.2 |
HIP 22320 |
15.30 |