メタデータ
| 項目 |
値 |
| Designation |
C/1974 F1 (Lovas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-08-22T03:56:03.344640Z |
| Orbit solution date (soln_date, UTC) |
2023-08-28T01:42:36Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1975-04-12.0000000 |
| e |
0.99979749 |
| q (au) |
3.011474 |
| a (au) |
14870.379859 |
| i (deg) |
50.648407 |
| Ω (om, deg) |
12.368086 |
| ω (w, deg) |
261.362838 |
| M (ma, deg) |
359.999928 |
等級
散乱 + 全体線形
$$
M_a = (7.432 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.432 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.727 |
| k |
0.999 |
| 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 |
02:37:40.07 |
+58:31:53.0 |
HIP 12369 |
22.28 |
| 2026-05-12 12:00 |
02:37:42.95 |
+58:32:01.3 |
HIP 12369 |
21.96 |
| 2026-05-13 00:00 |
02:37:45.83 |
+58:32:09.7 |
HIP 12369 |
21.64 |
| 2026-05-13 12:00 |
02:37:48.71 |
+58:32:18.3 |
HIP 12369 |
21.32 |
| 2026-05-14 00:00 |
02:37:51.58 |
+58:32:26.9 |
HIP 12369 |
21.01 |
| 2026-05-14 12:00 |
02:37:54.45 |
+58:32:35.7 |
HIP 12369 |
20.70 |
| 2026-05-15 00:00 |
02:37:57.31 |
+58:32:44.7 |
HIP 12369 |
20.39 |
| 2026-05-15 12:00 |
02:38:00.17 |
+58:32:53.7 |
HIP 12369 |
20.08 |
| 2026-05-16 00:00 |
02:38:03.02 |
+58:33:02.9 |
HIP 12369 |
19.77 |
| 2026-05-16 12:00 |
02:38:05.87 |
+58:33:12.1 |
HIP 12369 |
19.46 |
| 2026-05-17 00:00 |
02:38:08.72 |
+58:33:21.5 |
HIP 12369 |
19.16 |
| 2026-05-17 12:00 |
02:38:11.55 |
+58:33:31.1 |
HIP 12369 |
18.86 |
| 2026-05-18 00:00 |
02:38:14.39 |
+58:33:40.7 |
HIP 12369 |
18.56 |
| 2026-05-18 12:00 |
02:38:17.21 |
+58:33:50.5 |
HIP 12369 |
18.26 |
| 2026-05-19 00:00 |
02:38:20.03 |
+58:34:00.3 |
HIP 12369 |
17.96 |
| 2026-05-19 12:00 |
02:38:22.85 |
+58:34:10.3 |
HIP 12369 |
17.67 |
| 2026-05-20 00:00 |
02:38:25.65 |
+58:34:20.4 |
HIP 12369 |
17.38 |
| 2026-05-20 12:00 |
02:38:28.45 |
+58:34:30.6 |
HIP 12369 |
17.10 |
| 2026-05-21 00:00 |
02:38:31.25 |
+58:34:41.0 |
HIP 12369 |
16.82 |
| 2026-05-21 12:00 |
02:38:34.03 |
+58:34:51.4 |
HIP 12369 |
16.54 |
| 2026-05-22 00:00 |
02:38:36.81 |
+58:35:02.0 |
HIP 12369 |
16.26 |
| 2026-05-22 12:00 |
02:38:39.58 |
+58:35:12.6 |
HIP 12369 |
15.99 |
| 2026-05-23 00:00 |
02:38:42.35 |
+58:35:23.4 |
HIP 12369 |
15.72 |
| 2026-05-23 12:00 |
02:38:45.11 |
+58:35:34.3 |
HIP 12369 |
15.46 |
| 2026-05-24 00:00 |
02:38:47.85 |
+58:35:45.3 |
HIP 12369 |
15.20 |
| 2026-05-24 12:00 |
02:38:50.59 |
+58:35:56.4 |
HIP 12369 |
14.95 |
| 2026-05-25 00:00 |
02:38:53.33 |
+58:36:07.6 |
HIP 12369 |
14.70 |
| 2026-05-25 12:00 |
02:38:56.05 |
+58:36:18.9 |
HIP 12369 |
14.45 |
| 2026-05-26 00:00 |
02:38:58.76 |
+58:36:30.3 |
HIP 12369 |
14.21 |
| 2026-05-26 12:00 |
02:39:01.47 |
+58:36:41.8 |
HIP 12369 |
13.98 |
| 2026-05-27 00:00 |
02:39:04.17 |
+58:36:53.5 |
HIP 12369 |
13.75 |
| 2026-05-27 12:00 |
02:39:06.85 |
+58:37:05.2 |
HIP 12369 |
13.53 |
| 2026-05-28 00:00 |
02:39:09.53 |
+58:37:17.0 |
HIP 12369 |
13.32 |
| 2026-05-28 12:00 |
02:39:12.20 |
+58:37:29.0 |
HIP 12369 |
13.12 |
| 2026-05-29 00:00 |
02:39:14.86 |
+58:37:41.0 |
HIP 12369 |
12.92 |
| 2026-05-29 12:00 |
02:39:17.51 |
+58:37:53.1 |
HIP 12369 |
12.73 |
| 2026-05-30 00:00 |
02:39:20.15 |
+58:38:05.4 |
HIP 12369 |
12.54 |
| 2026-05-30 12:00 |
02:39:22.78 |
+58:38:17.7 |
HIP 12369 |
12.37 |
| 2026-05-31 00:00 |
02:39:25.40 |
+58:38:30.1 |
HIP 12369 |
12.20 |
| 2026-05-31 12:00 |
02:39:28.01 |
+58:38:42.7 |
HIP 12369 |
12.04 |
| 2026-06-01 00:00 |
02:39:30.60 |
+58:38:55.3 |
HIP 12369 |
11.90 |
| 2026-06-01 12:00 |
02:39:33.19 |
+58:39:08.0 |
HIP 12369 |
11.76 |
| 2026-06-02 00:00 |
02:39:35.77 |
+58:39:20.8 |
HIP 12369 |
11.63 |