C/2018 EF9 (Lemmon)
메타데이터
| 항목 |
값 |
| Designation |
C/2018 EF9 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-05-23T03:04:52.170240Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:12:43Z |
| Obs used |
191 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
45.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-04-18.0000000 |
| e |
0.99757417 |
| q (au) |
1.556633 |
| a (au) |
641.691299 |
| i (deg) |
84.694453 |
| Ω (om, deg) |
172.578066 |
| ω (w, deg) |
72.616575 |
| M (ma, deg) |
359.997870 |
밝기
산란 + 전체 선형
$$
M_a = (8.870 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.870 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
00:54:41.95 |
-37:32:54.0 |
HIP 4332 |
9.01 |
| 2026-02-03 12:00 |
00:54:45.59 |
-37:31:56.8 |
HIP 4332 |
8.18 |
| 2026-02-04 00:00 |
00:54:49.27 |
-37:30:59.6 |
HIP 4332 |
7.45 |
| 2026-02-04 12:00 |
00:54:53.00 |
-37:30:02.6 |
HIP 4332 |
6.83 |
| 2026-02-05 00:00 |
00:54:56.78 |
-37:29:05.6 |
HIP 4332 |
6.39 |
| 2026-02-05 12:00 |
00:55:00.60 |
-37:28:08.8 |
HIP 4332 |
6.14 |
| 2026-02-06 00:00 |
00:55:04.46 |
-37:27:12.1 |
HIP 4332 |
6.11 |
| 2026-02-06 12:00 |
00:55:08.38 |
-37:26:15.5 |
HIP 4332 |
6.32 |
| 2026-02-07 00:00 |
00:55:12.33 |
-37:25:19.0 |
HIP 4332 |
6.74 |
| 2026-02-07 12:00 |
00:55:16.33 |
-37:24:22.7 |
HIP 4332 |
7.34 |
| 2026-02-08 00:00 |
00:55:20.38 |
-37:23:26.4 |
HIP 4332 |
8.08 |
| 2026-02-08 12:00 |
00:55:24.47 |
-37:22:30.4 |
HIP 4332 |
8.93 |
| 2026-02-09 00:00 |
00:55:28.60 |
-37:21:34.4 |
HIP 4332 |
9.86 |
| 2026-02-09 12:00 |
00:55:32.78 |
-37:20:38.6 |
HIP 4332 |
10.84 |
| 2026-02-10 00:00 |
00:55:37.00 |
-37:19:42.9 |
HIP 4332 |
11.88 |
| 2026-02-10 12:00 |
00:55:41.26 |
-37:18:47.4 |
HIP 4332 |
12.96 |
| 2026-02-11 00:00 |
00:55:45.56 |
-37:17:52.1 |
HIP 4332 |
14.06 |
| 2026-02-11 12:00 |
00:55:49.91 |
-37:16:56.9 |
HIP 4332 |
15.19 |
| 2026-02-12 00:00 |
00:55:54.29 |
-37:16:01.9 |
HIP 4332 |
16.33 |
| 2026-02-12 12:00 |
00:55:58.72 |
-37:15:07.0 |
HIP 4332 |
17.50 |
| 2026-02-13 00:00 |
00:56:03.19 |
-37:14:12.3 |
HIP 4332 |
18.68 |
| 2026-02-13 12:00 |
00:56:07.70 |
-37:13:17.8 |
HIP 4332 |
19.87 |
| 2026-02-14 00:00 |
00:56:12.25 |
-37:12:23.4 |
HIP 4332 |
21.07 |
| 2026-02-14 12:00 |
00:56:16.84 |
-37:11:29.3 |
HIP 4332 |
22.28 |
| 2026-02-15 00:00 |
00:56:21.47 |
-37:10:35.3 |
HIP 4545 |
22.24 |
| 2026-02-15 12:00 |
00:56:26.14 |
-37:09:41.5 |
HIP 4545 |
21.53 |
| 2026-02-16 00:00 |
00:56:30.85 |
-37:08:47.9 |
HIP 4545 |
20.87 |
| 2026-02-16 12:00 |
00:56:35.60 |
-37:07:54.5 |
HIP 4545 |
20.26 |
| 2026-02-17 00:00 |
00:56:40.38 |
-37:07:01.3 |
HIP 4545 |
19.71 |
| 2026-02-17 12:00 |
00:56:45.21 |
-37:06:08.4 |
HIP 4545 |
19.23 |
| 2026-02-18 00:00 |
00:56:50.07 |
-37:05:15.6 |
HIP 4545 |
18.81 |
| 2026-02-18 12:00 |
00:56:54.97 |
-37:04:23.0 |
HIP 4568 |
18.38 |
| 2026-02-19 00:00 |
00:56:59.90 |
-37:03:30.7 |
HIP 4568 |
17.39 |
| 2026-02-19 12:00 |
00:57:04.87 |
-37:02:38.6 |
HIP 4568 |
16.43 |
| 2026-02-20 00:00 |
00:57:09.88 |
-37:01:46.7 |
HIP 4568 |
15.52 |
| 2026-02-20 12:00 |
00:57:14.92 |
-37:00:55.0 |
HIP 4568 |
14.66 |
| 2026-02-21 00:00 |
00:57:19.99 |
-37:00:03.6 |
HIP 4568 |
13.87 |
| 2026-02-21 12:00 |
00:57:25.11 |
-36:59:12.4 |
HIP 4568 |
13.15 |
| 2026-02-22 00:00 |
00:57:30.25 |
-36:58:21.5 |
HIP 4568 |
12.53 |
| 2026-02-22 12:00 |
00:57:35.43 |
-36:57:30.8 |
HIP 4568 |
12.02 |
| 2026-02-23 00:00 |
00:57:40.64 |
-36:56:40.3 |
HIP 4568 |
11.63 |
| 2026-02-23 12:00 |
00:57:45.89 |
-36:55:50.1 |
HIP 4568 |
11.38 |
| 2026-02-24 00:00 |
00:57:51.17 |
-36:55:00.2 |
HIP 4568 |
11.27 |