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 · University of Arizona 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
$$
M_a = (16.140 + 3.865\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.140 |
| n |
3.865 |
| 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) |
| 2026-09-25 00:00 |
04:49:39.28 |
+31:07:53.1 |
HIP 22375 |
12.92 |
| 2026-09-25 12:00 |
04:49:37.68 |
+31:08:01.4 |
HIP 22375 |
12.81 |
| 2026-09-26 00:00 |
04:49:36.02 |
+31:08:09.5 |
HIP 22375 |
12.70 |
| 2026-09-26 12:00 |
04:49:34.31 |
+31:08:17.5 |
HIP 22375 |
12.59 |
| 2026-09-27 00:00 |
04:49:32.55 |
+31:08:25.4 |
HIP 22375 |
12.48 |
| 2026-09-27 12:00 |
04:49:30.73 |
+31:08:33.2 |
HIP 22375 |
12.38 |
| 2026-09-28 00:00 |
04:49:28.86 |
+31:08:40.9 |
HIP 22375 |
12.29 |
| 2026-09-28 12:00 |
04:49:26.95 |
+31:08:48.4 |
HIP 22375 |
12.20 |
| 2026-09-29 00:00 |
04:49:24.97 |
+31:08:55.9 |
HIP 22375 |
12.11 |
| 2026-09-29 12:00 |
04:49:22.95 |
+31:09:03.2 |
HIP 22375 |
12.04 |
| 2026-09-30 00:00 |
04:49:20.88 |
+31:09:10.4 |
HIP 22375 |
11.98 |
| 2026-09-30 12:00 |
04:49:18.75 |
+31:09:17.5 |
HIP 22375 |
11.93 |
| 2026-10-01 00:00 |
04:49:16.57 |
+31:09:24.5 |
HIP 22375 |
11.90 |
| 2026-10-01 12:00 |
04:49:14.34 |
+31:09:31.3 |
HIP 22375 |
11.87 |
| 2026-10-02 00:00 |
04:49:12.06 |
+31:09:38.1 |
HIP 22375 |
11.87 |
| 2026-10-02 12:00 |
04:49:09.73 |
+31:09:44.7 |
HIP 22375 |
11.88 |
| 2026-10-03 00:00 |
04:49:07.35 |
+31:09:51.2 |
HIP 22375 |
11.91 |
| 2026-10-03 12:00 |
04:49:04.91 |
+31:09:57.5 |
HIP 22375 |
11.96 |
| 2026-10-04 00:00 |
04:49:02.43 |
+31:10:03.8 |
HIP 22375 |
12.03 |
| 2026-10-04 12:00 |
04:48:59.89 |
+31:10:09.9 |
HIP 22375 |
12.12 |
| 2026-10-05 00:00 |
04:48:57.30 |
+31:10:15.9 |
HIP 22375 |
12.24 |
| 2026-10-05 12:00 |
04:48:54.67 |
+31:10:21.8 |
HIP 22375 |
12.38 |
| 2026-10-06 00:00 |
04:48:51.98 |
+31:10:27.5 |
HIP 22375 |
12.54 |
| 2026-10-06 12:00 |
04:48:49.24 |
+31:10:33.1 |
HIP 22375 |
12.73 |
| 2026-10-07 00:00 |
04:48:46.45 |
+31:10:38.6 |
HIP 22375 |
12.94 |
| 2026-10-07 12:00 |
04:48:43.62 |
+31:10:43.9 |
HIP 22375 |
13.18 |
| 2026-10-08 00:00 |
04:48:40.73 |
+31:10:49.1 |
HIP 22375 |
13.44 |
| 2026-10-08 12:00 |
04:48:37.79 |
+31:10:54.2 |
HIP 22375 |
13.73 |
| 2026-10-09 00:00 |
04:48:34.81 |
+31:10:59.2 |
HIP 22375 |
14.04 |
| 2026-10-09 12:00 |
04:48:31.78 |
+31:11:04.0 |
HIP 22375 |
14.38 |
| 2026-10-10 00:00 |
04:48:28.69 |
+31:11:08.7 |
HIP 22375 |
14.74 |
| 2026-10-10 12:00 |
04:48:25.56 |
+31:11:13.2 |
HIP 22375 |
15.12 |
| 2026-10-11 00:00 |
04:48:22.38 |
+31:11:17.6 |
HIP 22375 |
15.53 |
| 2026-10-11 12:00 |
04:48:19.16 |
+31:11:21.9 |
HIP 22375 |
15.96 |
| 2026-10-12 00:00 |
04:48:15.88 |
+31:11:26.1 |
HIP 22375 |
16.41 |
| 2026-10-12 12:00 |
04:48:12.56 |
+31:11:30.1 |
HIP 22375 |
16.89 |
| 2026-10-13 00:00 |
04:48:09.19 |
+31:11:33.9 |
HIP 22375 |
17.38 |
| 2026-10-13 12:00 |
04:48:05.78 |
+31:11:37.6 |
HIP 22375 |
17.90 |
| 2026-10-14 00:00 |
04:48:02.31 |
+31:11:41.2 |
HIP 22375 |
18.43 |
| 2026-10-14 12:00 |
04:47:58.80 |
+31:11:44.7 |
HIP 22375 |
18.99 |
| 2026-10-15 00:00 |
04:47:55.25 |
+31:11:48.0 |
HIP 22375 |
19.56 |
| 2026-10-15 12:00 |
04:47:51.65 |
+31:11:51.1 |
HIP 22375 |
20.15 |
| 2026-10-16 00:00 |
04:47:48.01 |
+31:11:54.1 |
HIP 22375 |
20.76 |