메타데이터
| 항목 |
값 |
| Designation |
C/2008 FK75 (Lemmon-Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-09-29T05:04:17.762880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:18Z |
| Obs used |
3622 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
5.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-07-21.0000000 |
| e |
1.00270288 |
| q (au) |
4.510895 |
| a (au) |
-1668.924210 |
| i (deg) |
61.175512 |
| Ω (om, deg) |
218.266231 |
| ω (w, deg) |
80.415044 |
| M (ma, deg) |
-0.001015 |
밝기
산란 + 전체 선형
$$
M_a = (8.961 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.961 |
| n |
2.000 |
| gf |
0.913 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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 |
04:01:01.38 |
-10:07:59.1 |
HIP 18655 |
23.71 |
| 2026-03-26 12:00 |
04:01:03.65 |
-10:07:33.4 |
HIP 18655 |
24.40 |
| 2026-03-27 00:00 |
04:01:05.95 |
-10:07:07.8 |
HIP 18655 |
25.10 |
| 2026-03-27 12:00 |
04:01:08.27 |
-10:06:42.4 |
HIP 18655 |
25.81 |
| 2026-03-28 00:00 |
04:01:10.61 |
-10:06:17.0 |
HIP 18655 |
26.52 |
| 2026-03-28 12:00 |
04:01:12.98 |
-10:05:51.6 |
HIP 18655 |
27.24 |
| 2026-03-29 00:00 |
04:01:15.37 |
-10:05:26.4 |
HIP 18655 |
27.96 |
| 2026-03-29 12:00 |
04:01:17.79 |
-10:05:01.3 |
HIP 18655 |
28.68 |
| 2026-03-30 00:00 |
04:01:20.24 |
-10:04:36.2 |
HIP 18655 |
29.41 |
| 2026-03-30 12:00 |
04:01:22.70 |
-10:04:11.3 |
HIP 18655 |
30.15 |
| 2026-03-31 00:00 |
04:01:25.20 |
-10:03:46.4 |
HIP 18655 |
30.89 |
| 2026-03-31 12:00 |
04:01:27.71 |
-10:03:21.6 |
HIP 18655 |
31.63 |
| 2026-04-01 00:00 |
04:01:30.25 |
-10:02:57.0 |
HIP 18655 |
32.38 |
| 2026-04-01 12:00 |
04:01:32.81 |
-10:02:32.4 |
HIP 18655 |
33.13 |
| 2026-04-02 00:00 |
04:01:35.40 |
-10:02:07.9 |
HIP 18655 |
33.88 |
| 2026-04-02 12:00 |
04:01:38.01 |
-10:01:43.5 |
HIP 18655 |
34.64 |
| 2026-04-03 00:00 |
04:01:40.64 |
-10:01:19.3 |
HIP 18655 |
35.41 |
| 2026-04-03 12:00 |
04:01:43.30 |
-10:00:55.1 |
HIP 18655 |
36.17 |
| 2026-04-04 00:00 |
04:01:45.98 |
-10:00:31.1 |
HIP 18655 |
36.95 |
| 2026-04-04 12:00 |
04:01:48.68 |
-10:00:07.1 |
HIP 18655 |
37.72 |
| 2026-04-05 00:00 |
04:01:51.40 |
-09:59:43.3 |
HIP 18655 |
38.50 |
| 2026-04-05 12:00 |
04:01:54.15 |
-09:59:19.6 |
HIP 18655 |
39.28 |
| 2026-04-06 00:00 |
04:01:56.92 |
-09:58:56.0 |
HIP 19016 |
39.86 |
| 2026-04-06 12:00 |
04:01:59.71 |
-09:58:32.5 |
HIP 19016 |
39.38 |
| 2026-04-07 00:00 |
04:02:02.52 |
-09:58:09.1 |
HIP 19016 |
38.90 |
| 2026-04-07 12:00 |
04:02:05.35 |
-09:57:45.9 |
HIP 19016 |
38.43 |
| 2026-04-08 00:00 |
04:02:08.21 |
-09:57:22.8 |
HIP 19016 |
37.97 |
| 2026-04-08 12:00 |
04:02:11.08 |
-09:56:59.8 |
HIP 19016 |
37.51 |
| 2026-04-09 00:00 |
04:02:13.98 |
-09:56:36.9 |
HIP 19016 |
37.05 |
| 2026-04-09 12:00 |
04:02:16.90 |
-09:56:14.1 |
HIP 19016 |
36.60 |
| 2026-04-10 00:00 |
04:02:19.83 |
-09:55:51.5 |
HIP 19016 |
36.16 |
| 2026-04-10 12:00 |
04:02:22.79 |
-09:55:29.0 |
HIP 19016 |
35.73 |
| 2026-04-11 00:00 |
04:02:25.77 |
-09:55:06.6 |
HIP 19016 |
35.31 |
| 2026-04-11 12:00 |
04:02:28.77 |
-09:54:44.4 |
HIP 19016 |
34.89 |
| 2026-04-12 00:00 |
04:02:31.79 |
-09:54:22.3 |
HIP 19016 |
34.49 |
| 2026-04-12 12:00 |
04:02:34.82 |
-09:54:00.4 |
HIP 19016 |
34.09 |
| 2026-04-13 00:00 |
04:02:37.88 |
-09:53:38.5 |
HIP 19016 |
33.71 |
| 2026-04-13 12:00 |
04:02:40.96 |
-09:53:16.9 |
HIP 19016 |
33.33 |
| 2026-04-14 00:00 |
04:02:44.05 |
-09:52:55.3 |
HIP 19016 |
32.97 |
| 2026-04-14 12:00 |
04:02:47.17 |
-09:52:33.9 |
HIP 19016 |
32.62 |
| 2026-04-15 00:00 |
04:02:50.30 |
-09:52:12.7 |
HIP 19016 |
32.29 |
| 2026-04-15 12:00 |
04:02:53.45 |
-09:51:51.6 |
HIP 19016 |
31.96 |
| 2026-04-16 00:00 |
04:02:56.62 |
-09:51:30.6 |
HIP 19016 |
31.66 |