메타데이터
| 항목 |
값 |
| 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 |
Osculating 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (16.140 + 3.866\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.140 |
| n |
3.866 |
| gf |
1.000 |
| gb |
-0.685 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:23:26.81 |
+30:07:30.8 |
HIP 20415 |
22.92 |
| 2026-03-26 12:00 |
04:23:30.31 |
+30:07:26.2 |
HIP 20415 |
23.46 |
| 2026-03-27 00:00 |
04:23:33.86 |
+30:07:21.8 |
HIP 20415 |
24.01 |
| 2026-03-27 12:00 |
04:23:37.44 |
+30:07:17.5 |
HIP 20415 |
24.58 |
| 2026-03-28 00:00 |
04:23:41.08 |
+30:07:13.4 |
HIP 20415 |
25.17 |
| 2026-03-28 12:00 |
04:23:44.76 |
+30:07:09.4 |
HIP 20415 |
25.77 |
| 2026-03-29 00:00 |
04:23:48.48 |
+30:07:05.6 |
HIP 20415 |
26.39 |
| 2026-03-29 12:00 |
04:23:52.24 |
+30:07:01.9 |
HIP 20674 |
26.88 |
| 2026-03-30 00:00 |
04:23:56.05 |
+30:06:58.4 |
HIP 20674 |
26.13 |
| 2026-03-30 12:00 |
04:23:59.90 |
+30:06:55.0 |
HIP 20674 |
25.37 |
| 2026-03-31 00:00 |
04:24:03.79 |
+30:06:51.8 |
HIP 20674 |
24.62 |
| 2026-03-31 12:00 |
04:24:07.72 |
+30:06:48.7 |
HIP 20674 |
23.86 |
| 2026-04-01 00:00 |
04:24:11.70 |
+30:06:45.8 |
HIP 20674 |
23.10 |
| 2026-04-01 12:00 |
04:24:15.72 |
+30:06:43.0 |
HIP 20674 |
22.34 |
| 2026-04-02 00:00 |
04:24:19.78 |
+30:06:40.4 |
HIP 20674 |
21.59 |
| 2026-04-02 12:00 |
04:24:23.88 |
+30:06:37.9 |
HIP 20674 |
20.84 |
| 2026-04-03 00:00 |
04:24:28.02 |
+30:06:35.6 |
HIP 20674 |
20.10 |
| 2026-04-03 12:00 |
04:24:32.20 |
+30:06:33.4 |
HIP 20674 |
19.36 |
| 2026-04-04 00:00 |
04:24:36.42 |
+30:06:31.3 |
HIP 20674 |
18.63 |
| 2026-04-04 12:00 |
04:24:40.68 |
+30:06:29.4 |
HIP 20674 |
17.92 |
| 2026-04-05 00:00 |
04:24:44.98 |
+30:06:27.7 |
HIP 20674 |
17.22 |
| 2026-04-05 12:00 |
04:24:49.32 |
+30:06:26.1 |
HIP 20674 |
16.54 |
| 2026-04-06 00:00 |
04:24:53.70 |
+30:06:24.6 |
HIP 20674 |
15.88 |
| 2026-04-06 12:00 |
04:24:58.12 |
+30:06:23.3 |
HIP 20674 |
15.25 |
| 2026-04-07 00:00 |
04:25:02.57 |
+30:06:22.1 |
HIP 20674 |
14.66 |
| 2026-04-07 12:00 |
04:25:07.07 |
+30:06:21.1 |
HIP 20674 |
14.10 |
| 2026-04-08 00:00 |
04:25:11.60 |
+30:06:20.2 |
HIP 20674 |
13.59 |
| 2026-04-08 12:00 |
04:25:16.17 |
+30:06:19.4 |
HIP 20674 |
13.12 |
| 2026-04-09 00:00 |
04:25:20.77 |
+30:06:18.8 |
HIP 20674 |
12.72 |
| 2026-04-09 12:00 |
04:25:25.42 |
+30:06:18.4 |
HIP 20674 |
12.39 |
| 2026-04-10 00:00 |
04:25:30.10 |
+30:06:18.0 |
HIP 20674 |
12.13 |
| 2026-04-10 12:00 |
04:25:34.81 |
+30:06:17.9 |
HIP 20674 |
11.95 |
| 2026-04-11 00:00 |
04:25:39.57 |
+30:06:17.8 |
HIP 20674 |
11.86 |
| 2026-04-11 12:00 |
04:25:44.35 |
+30:06:17.9 |
HIP 20674 |
11.86 |
| 2026-04-12 00:00 |
04:25:49.18 |
+30:06:18.2 |
HIP 20674 |
11.96 |
| 2026-04-12 12:00 |
04:25:54.04 |
+30:06:18.6 |
HIP 20674 |
12.15 |
| 2026-04-13 00:00 |
04:25:58.93 |
+30:06:19.1 |
HIP 20674 |
12.42 |
| 2026-04-13 12:00 |
04:26:03.86 |
+30:06:19.8 |
HIP 20674 |
12.79 |
| 2026-04-14 00:00 |
04:26:08.82 |
+30:06:20.6 |
HIP 20674 |
13.24 |
| 2026-04-14 12:00 |
04:26:13.81 |
+30:06:21.5 |
HIP 20674 |
13.76 |
| 2026-04-15 00:00 |
04:26:18.84 |
+30:06:22.6 |
HIP 20674 |
14.35 |
| 2026-04-15 12:00 |
04:26:23.91 |
+30:06:23.8 |
HIP 20674 |
15.01 |
| 2026-04-16 00:00 |
04:26:29.00 |
+30:06:25.2 |
HIP 20674 |
15.72 |