C/2018 F3 (Johnson)
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 · 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 |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
13:59:15.92 |
+74:28:19.3 |
HIP 68072 |
18.80 |
| 2026-02-03 12:00 |
13:59:12.95 |
+74:29:51.2 |
HIP 68072 |
17.51 |
| 2026-02-04 00:00 |
13:59:09.79 |
+74:31:22.9 |
HIP 68072 |
16.26 |
| 2026-02-04 12:00 |
13:59:06.46 |
+74:32:54.4 |
HIP 68072 |
15.05 |
| 2026-02-05 00:00 |
13:59:02.95 |
+74:34:25.7 |
HIP 68072 |
13.91 |
| 2026-02-05 12:00 |
13:58:59.25 |
+74:35:56.8 |
HIP 68072 |
12.84 |
| 2026-02-06 00:00 |
13:58:55.37 |
+74:37:27.8 |
HIP 68072 |
11.86 |
| 2026-02-06 12:00 |
13:58:51.31 |
+74:38:58.5 |
HIP 68072 |
11.01 |
| 2026-02-07 00:00 |
13:58:47.06 |
+74:40:29.0 |
HIP 68072 |
10.30 |
| 2026-02-07 12:00 |
13:58:42.63 |
+74:41:59.3 |
HIP 68072 |
9.77 |
| 2026-02-08 00:00 |
13:58:38.02 |
+74:43:29.4 |
HIP 68072 |
9.46 |
| 2026-02-08 12:00 |
13:58:33.22 |
+74:44:59.2 |
HIP 68072 |
9.37 |
| 2026-02-09 00:00 |
13:58:28.23 |
+74:46:28.8 |
HIP 68072 |
9.52 |
| 2026-02-09 12:00 |
13:58:23.06 |
+74:47:58.2 |
HIP 68072 |
9.90 |
| 2026-02-10 00:00 |
13:58:17.71 |
+74:49:27.2 |
HIP 68072 |
10.48 |
| 2026-02-10 12:00 |
13:58:12.17 |
+74:50:56.1 |
HIP 68072 |
11.22 |
| 2026-02-11 00:00 |
13:58:06.44 |
+74:52:24.6 |
HIP 68072 |
12.10 |
| 2026-02-11 12:00 |
13:58:00.52 |
+74:53:52.9 |
HIP 68072 |
13.09 |
| 2026-02-12 00:00 |
13:57:54.42 |
+74:55:20.9 |
HIP 68072 |
14.16 |
| 2026-02-12 12:00 |
13:57:48.14 |
+74:56:48.6 |
HIP 68072 |
15.31 |
| 2026-02-13 00:00 |
13:57:41.66 |
+74:58:16.0 |
HIP 68072 |
16.50 |
| 2026-02-13 12:00 |
13:57:35.00 |
+74:59:43.1 |
HIP 68072 |
17.74 |
| 2026-02-14 00:00 |
13:57:28.16 |
+75:01:09.9 |
HIP 68072 |
19.00 |
| 2026-02-14 12:00 |
13:57:21.12 |
+75:02:36.3 |
HIP 68072 |
20.30 |
| 2026-02-15 00:00 |
13:57:13.90 |
+75:04:02.4 |
HIP 68072 |
21.61 |
| 2026-02-15 12:00 |
13:57:06.49 |
+75:05:28.2 |
HIP 68072 |
22.95 |
| 2026-02-16 00:00 |
13:56:58.90 |
+75:06:53.6 |
HIP 68072 |
24.29 |
| 2026-02-16 12:00 |
13:56:51.11 |
+75:08:18.7 |
HIP 68072 |
25.65 |
| 2026-02-17 00:00 |
13:56:43.14 |
+75:09:43.4 |
HIP 68072 |
27.01 |
| 2026-02-17 12:00 |
13:56:34.99 |
+75:11:07.7 |
HIP 68072 |
28.39 |
| 2026-02-18 00:00 |
13:56:26.65 |
+75:12:31.7 |
HIP 68072 |
29.77 |
| 2026-02-18 12:00 |
13:56:18.12 |
+75:13:55.3 |
HIP 68072 |
31.15 |
| 2026-02-19 00:00 |
13:56:09.41 |
+75:15:18.5 |
HIP 67467 |
31.21 |
| 2026-02-19 12:00 |
13:56:00.51 |
+75:16:41.2 |
HIP 67467 |
29.93 |
| 2026-02-20 00:00 |
13:55:51.42 |
+75:18:03.6 |
HIP 67467 |
28.67 |
| 2026-02-20 12:00 |
13:55:42.15 |
+75:19:25.6 |
HIP 67467 |
27.42 |
| 2026-02-21 00:00 |
13:55:32.70 |
+75:20:47.1 |
HIP 67467 |
26.19 |
| 2026-02-21 12:00 |
13:55:23.06 |
+75:22:08.2 |
HIP 67467 |
24.99 |
| 2026-02-22 00:00 |
13:55:13.24 |
+75:23:28.9 |
HIP 67467 |
23.81 |
| 2026-02-22 12:00 |
13:55:03.24 |
+75:24:49.1 |
HIP 67467 |
22.66 |
| 2026-02-23 00:00 |
13:54:53.06 |
+75:26:08.9 |
HIP 67467 |
21.54 |
| 2026-02-23 12:00 |
13:54:42.69 |
+75:27:28.2 |
HIP 67467 |
20.47 |
| 2026-02-24 00:00 |
13:54:32.14 |
+75:28:47.1 |
HIP 67467 |
19.43 |