メタデータ
| 項目 |
値 |
| Designation |
C/2018 R4 (Fuls) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-03T15:59:10.642560Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:32Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-09-09T07:28:08.544000Z |
| Discovery magnitude (MPC) |
19.10 G |
| Discovery observatory (MPC) |
703 · Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-09-02.0000000 |
| e |
0.99435878 |
| q (au) |
1.709214 |
| a (au) |
302.986704 |
| i (deg) |
11.682034 |
| Ω (om, deg) |
298.460925 |
| ω (w, deg) |
345.148323 |
| M (ma, deg) |
0.034075 |
等級
散乱 + 全体線形
$$
M_a = (16.140 + 3.866\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.140 |
| n |
3.866 |
| gf |
1.000 |
| gb |
-0.685 |
| k |
0.800 |
| 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 |
04:31:30.00 |
+30:10:28.8 |
HIP 21122 |
14.91 |
| 2026-05-12 12:00 |
04:31:36.32 |
+30:10:36.5 |
HIP 21122 |
14.98 |
| 2026-05-13 00:00 |
04:31:42.65 |
+30:10:44.3 |
HIP 21122 |
15.17 |
| 2026-05-13 12:00 |
04:31:48.99 |
+30:10:52.2 |
HIP 21122 |
15.49 |
| 2026-05-14 00:00 |
04:31:55.34 |
+30:11:00.2 |
HIP 21122 |
15.92 |
| 2026-05-14 12:00 |
04:32:01.71 |
+30:11:08.3 |
HIP 21122 |
16.47 |
| 2026-05-15 00:00 |
04:32:08.09 |
+30:11:16.5 |
HIP 21122 |
17.10 |
| 2026-05-15 12:00 |
04:32:14.48 |
+30:11:24.8 |
HIP 21122 |
17.83 |
| 2026-05-16 00:00 |
04:32:20.88 |
+30:11:33.2 |
HIP 21122 |
18.63 |
| 2026-05-16 12:00 |
04:32:27.29 |
+30:11:41.7 |
HIP 21162 |
19.47 |
| 2026-05-17 00:00 |
04:32:33.71 |
+30:11:50.3 |
HIP 21162 |
19.61 |
| 2026-05-17 12:00 |
04:32:40.14 |
+30:11:59.0 |
HIP 21162 |
19.85 |
| 2026-05-18 00:00 |
04:32:46.59 |
+30:12:07.8 |
HIP 21162 |
20.18 |
| 2026-05-18 12:00 |
04:32:53.04 |
+30:12:16.7 |
HIP 21162 |
20.60 |
| 2026-05-19 00:00 |
04:32:59.50 |
+30:12:25.6 |
HIP 21162 |
21.10 |
| 2026-05-19 12:00 |
04:33:05.97 |
+30:12:34.7 |
HIP 21162 |
21.68 |
| 2026-05-20 00:00 |
04:33:12.45 |
+30:12:43.9 |
HIP 21162 |
22.34 |
| 2026-05-20 12:00 |
04:33:18.93 |
+30:12:53.1 |
HIP 21162 |
23.06 |
| 2026-05-21 00:00 |
04:33:25.42 |
+30:13:02.5 |
HIP 21162 |
23.84 |
| 2026-05-21 12:00 |
04:33:31.92 |
+30:13:11.9 |
HIP 21162 |
24.68 |
| 2026-05-22 00:00 |
04:33:38.43 |
+30:13:21.4 |
HIP 21162 |
25.57 |
| 2026-05-22 12:00 |
04:33:44.94 |
+30:13:31.0 |
HIP 21162 |
26.51 |
| 2026-05-23 00:00 |
04:33:51.46 |
+30:13:40.7 |
HIP 21162 |
27.48 |
| 2026-05-23 12:00 |
04:33:57.98 |
+30:13:50.5 |
HIP 21373 |
27.68 |
| 2026-05-24 00:00 |
04:34:04.51 |
+30:14:00.3 |
HIP 21373 |
27.02 |
| 2026-05-24 12:00 |
04:34:11.04 |
+30:14:10.3 |
HIP 21373 |
26.42 |
| 2026-05-25 00:00 |
04:34:17.58 |
+30:14:20.3 |
HIP 21373 |
25.89 |
| 2026-05-25 12:00 |
04:34:24.12 |
+30:14:30.4 |
HIP 21373 |
25.43 |
| 2026-05-26 00:00 |
04:34:30.66 |
+30:14:40.6 |
HIP 21373 |
25.04 |
| 2026-05-26 12:00 |
04:34:37.21 |
+30:14:50.9 |
HIP 21373 |
24.74 |
| 2026-05-27 00:00 |
04:34:43.76 |
+30:15:01.2 |
HIP 21373 |
24.51 |
| 2026-05-27 12:00 |
04:34:50.31 |
+30:15:11.7 |
HIP 21373 |
24.36 |
| 2026-05-28 00:00 |
04:34:56.86 |
+30:15:22.2 |
HIP 21373 |
24.30 |
| 2026-05-28 12:00 |
04:35:03.42 |
+30:15:32.8 |
HIP 21373 |
24.32 |
| 2026-05-29 00:00 |
04:35:09.98 |
+30:15:43.5 |
HIP 21373 |
24.43 |
| 2026-05-29 12:00 |
04:35:16.54 |
+30:15:54.2 |
HIP 21373 |
24.62 |
| 2026-05-30 00:00 |
04:35:23.10 |
+30:16:05.0 |
HIP 21373 |
24.90 |
| 2026-05-30 12:00 |
04:35:29.66 |
+30:16:15.9 |
HIP 21516 |
23.89 |
| 2026-05-31 00:00 |
04:35:36.22 |
+30:16:26.9 |
HIP 21516 |
22.49 |
| 2026-05-31 12:00 |
04:35:42.78 |
+30:16:38.0 |
HIP 21516 |
21.10 |
| 2026-06-01 00:00 |
04:35:49.34 |
+30:16:49.1 |
HIP 21516 |
19.71 |
| 2026-06-01 12:00 |
04:35:55.90 |
+30:17:00.3 |
HIP 21516 |
18.33 |
| 2026-06-02 00:00 |
04:36:02.46 |
+30:17:11.6 |
HIP 21516 |
16.95 |