메타데이터
| 항목 |
값 |
| 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 |
Osculating 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (14.744 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.744 |
| n |
2.000 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
13:39:05.19 |
+76:29:43.8 |
HIP 66251 |
15.59 |
| 2026-03-26 12:00 |
13:38:45.76 |
+76:30:23.5 |
HIP 66251 |
14.35 |
| 2026-03-27 00:00 |
13:38:26.23 |
+76:31:02.4 |
HIP 66251 |
13.13 |
| 2026-03-27 12:00 |
13:38:06.62 |
+76:31:40.5 |
HIP 66251 |
11.92 |
| 2026-03-28 00:00 |
13:37:46.92 |
+76:32:17.9 |
HIP 66251 |
10.72 |
| 2026-03-28 12:00 |
13:37:27.14 |
+76:32:54.4 |
HIP 66251 |
9.56 |
| 2026-03-29 00:00 |
13:37:07.27 |
+76:33:30.2 |
HIP 66251 |
8.43 |
| 2026-03-29 12:00 |
13:36:47.33 |
+76:34:05.1 |
HIP 66251 |
7.35 |
| 2026-03-30 00:00 |
13:36:27.32 |
+76:34:39.3 |
HIP 66251 |
6.35 |
| 2026-03-30 12:00 |
13:36:07.23 |
+76:35:12.7 |
HIP 66251 |
5.46 |
| 2026-03-31 00:00 |
13:35:47.07 |
+76:35:45.2 |
HIP 66251 |
4.76 |
| 2026-03-31 12:00 |
13:35:26.84 |
+76:36:17.0 |
HIP 66251 |
4.32 |
| 2026-04-01 00:00 |
13:35:06.55 |
+76:36:48.0 |
HIP 66251 |
4.23 |
| 2026-04-01 12:00 |
13:34:46.19 |
+76:37:18.1 |
HIP 66251 |
4.50 |
| 2026-04-02 00:00 |
13:34:25.77 |
+76:37:47.5 |
HIP 66251 |
5.09 |
| 2026-04-02 12:00 |
13:34:05.29 |
+76:38:16.1 |
HIP 66251 |
5.88 |
| 2026-04-03 00:00 |
13:33:44.76 |
+76:38:43.8 |
HIP 66251 |
6.82 |
| 2026-04-03 12:00 |
13:33:24.17 |
+76:39:10.7 |
HIP 66251 |
7.84 |
| 2026-04-04 00:00 |
13:33:03.53 |
+76:39:36.9 |
HIP 66251 |
8.91 |
| 2026-04-04 12:00 |
13:32:42.84 |
+76:40:02.2 |
HIP 66251 |
10.03 |
| 2026-04-05 00:00 |
13:32:22.11 |
+76:40:26.7 |
HIP 66251 |
11.17 |
| 2026-04-05 12:00 |
13:32:01.33 |
+76:40:50.4 |
HIP 66251 |
12.33 |
| 2026-04-06 00:00 |
13:31:40.51 |
+76:41:13.2 |
HIP 66251 |
13.50 |
| 2026-04-06 12:00 |
13:31:19.66 |
+76:41:35.3 |
HIP 66251 |
14.67 |
| 2026-04-07 00:00 |
13:30:58.76 |
+76:41:56.5 |
HIP 66251 |
15.86 |
| 2026-04-07 12:00 |
13:30:37.83 |
+76:42:16.9 |
HIP 66251 |
17.05 |
| 2026-04-08 00:00 |
13:30:16.88 |
+76:42:36.5 |
HIP 66251 |
18.24 |
| 2026-04-08 12:00 |
13:29:55.89 |
+76:42:55.3 |
HIP 66251 |
19.43 |
| 2026-04-09 00:00 |
13:29:34.87 |
+76:43:13.3 |
HIP 66251 |
20.62 |
| 2026-04-09 12:00 |
13:29:13.84 |
+76:43:30.4 |
HIP 66251 |
21.82 |
| 2026-04-10 00:00 |
13:28:52.78 |
+76:43:46.7 |
HIP 66251 |
23.01 |
| 2026-04-10 12:00 |
13:28:31.71 |
+76:44:02.2 |
HIP 66251 |
24.20 |
| 2026-04-11 00:00 |
13:28:10.62 |
+76:44:16.8 |
HIP 66251 |
25.39 |
| 2026-04-11 12:00 |
13:27:49.52 |
+76:44:30.7 |
HIP 66251 |
26.58 |
| 2026-04-12 00:00 |
13:27:28.40 |
+76:44:43.7 |
HIP 66251 |
27.77 |
| 2026-04-12 12:00 |
13:27:07.28 |
+76:44:55.9 |
HIP 64992 |
27.01 |
| 2026-04-13 00:00 |
13:26:46.16 |
+76:45:07.3 |
HIP 64992 |
25.79 |
| 2026-04-13 12:00 |
13:26:25.04 |
+76:45:17.8 |
HIP 64992 |
24.56 |
| 2026-04-14 00:00 |
13:26:03.91 |
+76:45:27.5 |
HIP 64992 |
23.34 |
| 2026-04-14 12:00 |
13:25:42.79 |
+76:45:36.4 |
HIP 64992 |
22.12 |
| 2026-04-15 00:00 |
13:25:21.68 |
+76:45:44.5 |
HIP 64992 |
20.91 |
| 2026-04-15 12:00 |
13:25:00.57 |
+76:45:51.8 |
HIP 64992 |
19.69 |
| 2026-04-16 00:00 |
13:24:39.48 |
+76:45:58.2 |
HIP 64992 |
18.48 |