メタデータ
| 項目 |
値 |
| Designation |
C/2018 F3 (Johnson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-08-15T05:34:33.502080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:43Z |
| Obs used |
51 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-03-20T06:23:56.832000Z |
| Discovery magnitude (MPC) |
19.40 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-03-23.0000000 |
| e |
1.00001624 |
| q (au) |
2.483147 |
| a (au) |
-152892.693615 |
| i (deg) |
105.534913 |
| Ω (om, deg) |
173.031139 |
| ω (w, deg) |
293.010797 |
| M (ma, deg) |
0.000004 |
等級
散乱 + 全体線形
$$
M_a = (14.744 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.744 |
| n |
2.000 |
| gf |
0.992 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
12:58:17.82 |
+76:04:05.2 |
HIP 63200 |
15.97 |
| 2026-06-01 12:00 |
12:58:07.00 |
+76:03:10.6 |
HIP 63200 |
16.66 |
| 2026-06-02 00:00 |
12:57:56.34 |
+76:02:15.6 |
HIP 63200 |
17.40 |
| 2026-06-02 12:00 |
12:57:45.85 |
+76:01:20.3 |
HIP 63200 |
18.19 |
| 2026-06-03 00:00 |
12:57:35.53 |
+76:00:24.4 |
HIP 63200 |
19.02 |
| 2026-06-03 12:00 |
12:57:25.38 |
+75:59:28.2 |
HIP 63200 |
19.88 |
| 2026-06-04 00:00 |
12:57:15.39 |
+75:58:31.7 |
HIP 63200 |
20.77 |
| 2026-06-04 12:00 |
12:57:05.58 |
+75:57:34.7 |
HIP 63200 |
21.70 |
| 2026-06-05 00:00 |
12:56:55.94 |
+75:56:37.3 |
HIP 63200 |
22.64 |
| 2026-06-05 12:00 |
12:56:46.47 |
+75:55:39.6 |
HIP 63094 |
21.92 |
| 2026-06-06 00:00 |
12:56:37.17 |
+75:54:41.5 |
HIP 63094 |
20.87 |
| 2026-06-06 12:00 |
12:56:28.04 |
+75:53:43.0 |
HIP 63094 |
19.82 |
| 2026-06-07 00:00 |
12:56:19.09 |
+75:52:44.2 |
HIP 63094 |
18.77 |
| 2026-06-07 12:00 |
12:56:10.30 |
+75:51:45.0 |
HIP 63094 |
17.72 |
| 2026-06-08 00:00 |
12:56:01.69 |
+75:50:45.4 |
HIP 63094 |
16.68 |
| 2026-06-08 12:00 |
12:55:53.24 |
+75:49:45.5 |
HIP 63094 |
15.65 |
| 2026-06-09 00:00 |
12:55:44.97 |
+75:48:45.3 |
HIP 63094 |
14.63 |
| 2026-06-09 12:00 |
12:55:36.88 |
+75:47:44.8 |
HIP 63094 |
13.61 |
| 2026-06-10 00:00 |
12:55:28.95 |
+75:46:43.9 |
HIP 63094 |
12.61 |
| 2026-06-10 12:00 |
12:55:21.20 |
+75:45:42.7 |
HIP 63094 |
11.63 |
| 2026-06-11 00:00 |
12:55:13.62 |
+75:44:41.2 |
HIP 63094 |
10.67 |
| 2026-06-11 12:00 |
12:55:06.21 |
+75:43:39.4 |
HIP 63094 |
9.74 |
| 2026-06-12 00:00 |
12:54:58.97 |
+75:42:37.3 |
HIP 63094 |
8.84 |
| 2026-06-12 12:00 |
12:54:51.91 |
+75:41:34.8 |
HIP 63094 |
8.00 |
| 2026-06-13 00:00 |
12:54:45.02 |
+75:40:32.1 |
HIP 63094 |
7.22 |
| 2026-06-13 12:00 |
12:54:38.31 |
+75:39:29.2 |
HIP 63094 |
6.54 |
| 2026-06-14 00:00 |
12:54:31.76 |
+75:38:25.9 |
HIP 63094 |
5.99 |
| 2026-06-14 12:00 |
12:54:25.39 |
+75:37:22.3 |
HIP 63094 |
5.60 |
| 2026-06-15 00:00 |
12:54:19.19 |
+75:36:18.5 |
HIP 63094 |
5.41 |
| 2026-06-15 12:00 |
12:54:13.17 |
+75:35:14.5 |
HIP 63094 |
5.45 |
| 2026-06-16 00:00 |
12:54:07.32 |
+75:34:10.2 |
HIP 63094 |
5.70 |
| 2026-06-16 12:00 |
12:54:01.64 |
+75:33:05.6 |
HIP 63094 |
6.15 |
| 2026-06-17 00:00 |
12:53:56.13 |
+75:32:00.8 |
HIP 63094 |
6.75 |
| 2026-06-17 12:00 |
12:53:50.80 |
+75:30:55.8 |
HIP 62975 |
6.54 |
| 2026-06-18 00:00 |
12:53:45.63 |
+75:29:50.5 |
HIP 62975 |
5.59 |
| 2026-06-18 12:00 |
12:53:40.64 |
+75:28:45.0 |
HIP 62975 |
4.70 |
| 2026-06-19 00:00 |
12:53:35.82 |
+75:27:39.3 |
HIP 62975 |
3.94 |
| 2026-06-19 12:00 |
12:53:31.17 |
+75:26:33.4 |
HIP 62975 |
3.38 |
| 2026-06-20 00:00 |
12:53:26.69 |
+75:25:27.3 |
HIP 62975 |
3.14 |
| 2026-06-20 12:00 |
12:53:22.38 |
+75:24:21.0 |
HIP 62975 |
3.29 |
| 2026-06-21 00:00 |
12:53:18.24 |
+75:23:14.5 |
HIP 62975 |
3.78 |
| 2026-06-21 12:00 |
12:53:14.27 |
+75:22:07.8 |
HIP 62975 |
4.51 |
| 2026-06-22 00:00 |
12:53:10.46 |
+75:21:00.9 |
HIP 62975 |
5.37 |