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) |
| 2026-09-20 00:00 |
13:16:54.95 |
+72:29:14.1 |
HIP 64708 |
21.27 |
| 2026-09-20 12:00 |
13:17:10.63 |
+72:28:47.4 |
HIP 64708 |
21.17 |
| 2026-09-21 00:00 |
13:17:26.35 |
+72:28:21.2 |
HIP 64708 |
21.17 |
| 2026-09-21 12:00 |
13:17:42.11 |
+72:27:55.5 |
HIP 64708 |
21.24 |
| 2026-09-22 00:00 |
13:17:57.90 |
+72:27:30.3 |
HIP 64708 |
21.41 |
| 2026-09-22 12:00 |
13:18:13.74 |
+72:27:05.6 |
HIP 64708 |
21.65 |
| 2026-09-23 00:00 |
13:18:29.62 |
+72:26:41.5 |
HIP 64708 |
21.98 |
| 2026-09-23 12:00 |
13:18:45.54 |
+72:26:17.9 |
HIP 64708 |
22.38 |
| 2026-09-24 00:00 |
13:19:01.49 |
+72:25:54.8 |
HIP 64708 |
22.85 |
| 2026-09-24 12:00 |
13:19:17.48 |
+72:25:32.2 |
HIP 64708 |
23.40 |
| 2026-09-25 00:00 |
13:19:33.51 |
+72:25:10.1 |
HIP 64708 |
24.01 |
| 2026-09-25 12:00 |
13:19:49.57 |
+72:24:48.6 |
HIP 64708 |
24.67 |
| 2026-09-26 00:00 |
13:20:05.67 |
+72:24:27.6 |
HIP 64708 |
25.39 |
| 2026-09-26 12:00 |
13:20:21.81 |
+72:24:07.2 |
HIP 65512 |
25.62 |
| 2026-09-27 00:00 |
13:20:37.97 |
+72:23:47.2 |
HIP 65512 |
24.35 |
| 2026-09-27 12:00 |
13:20:54.18 |
+72:23:27.8 |
HIP 65512 |
23.09 |
| 2026-09-28 00:00 |
13:21:10.41 |
+72:23:08.9 |
HIP 65512 |
21.82 |
| 2026-09-28 12:00 |
13:21:26.68 |
+72:22:50.6 |
HIP 65512 |
20.56 |
| 2026-09-29 00:00 |
13:21:42.98 |
+72:22:32.8 |
HIP 65512 |
19.29 |
| 2026-09-29 12:00 |
13:21:59.30 |
+72:22:15.5 |
HIP 65512 |
18.03 |
| 2026-09-30 00:00 |
13:22:15.66 |
+72:21:58.8 |
HIP 65512 |
16.76 |
| 2026-09-30 12:00 |
13:22:32.06 |
+72:21:42.6 |
HIP 65512 |
15.50 |
| 2026-10-01 00:00 |
13:22:48.47 |
+72:21:27.0 |
HIP 65512 |
14.25 |
| 2026-10-01 12:00 |
13:23:04.92 |
+72:21:11.9 |
HIP 65512 |
12.99 |
| 2026-10-02 00:00 |
13:23:21.40 |
+72:20:57.4 |
HIP 65512 |
11.74 |
| 2026-10-02 12:00 |
13:23:37.90 |
+72:20:43.4 |
HIP 65512 |
10.50 |
| 2026-10-03 00:00 |
13:23:54.43 |
+72:20:29.9 |
HIP 65512 |
9.27 |
| 2026-10-03 12:00 |
13:24:10.99 |
+72:20:17.0 |
HIP 65512 |
8.06 |
| 2026-10-04 00:00 |
13:24:27.58 |
+72:20:04.7 |
HIP 65512 |
6.87 |
| 2026-10-04 12:00 |
13:24:44.18 |
+72:19:52.9 |
HIP 65512 |
5.72 |
| 2026-10-05 00:00 |
13:25:00.82 |
+72:19:41.7 |
HIP 65512 |
4.65 |
| 2026-10-05 12:00 |
13:25:17.47 |
+72:19:31.0 |
HIP 65512 |
3.71 |
| 2026-10-06 00:00 |
13:25:34.15 |
+72:19:20.9 |
HIP 65512 |
3.04 |
| 2026-10-06 12:00 |
13:25:50.85 |
+72:19:11.4 |
HIP 65512 |
2.84 |
| 2026-10-07 00:00 |
13:26:07.57 |
+72:19:02.4 |
HIP 65512 |
3.20 |
| 2026-10-07 12:00 |
13:26:24.32 |
+72:18:54.0 |
HIP 65512 |
3.97 |
| 2026-10-08 00:00 |
13:26:41.08 |
+72:18:46.1 |
HIP 65512 |
4.96 |
| 2026-10-08 12:00 |
13:26:57.86 |
+72:18:38.9 |
HIP 65512 |
6.06 |
| 2026-10-09 00:00 |
13:27:14.66 |
+72:18:32.2 |
HIP 65536 |
7.07 |
| 2026-10-09 12:00 |
13:27:31.48 |
+72:18:26.0 |
HIP 65536 |
8.10 |
| 2026-10-10 00:00 |
13:27:48.32 |
+72:18:20.5 |
HIP 65536 |
9.18 |
| 2026-10-10 12:00 |
13:28:05.17 |
+72:18:15.5 |
HIP 65536 |
10.31 |
| 2026-10-11 00:00 |
13:28:22.04 |
+72:18:11.1 |
HIP 65536 |
11.46 |