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) |
| 2026-06-01 00:00 |
04:08:34.88 |
-09:32:49.8 |
HIP 19448 |
21.17 |
| 2026-06-01 12:00 |
04:08:38.73 |
-09:32:47.8 |
HIP 19448 |
20.31 |
| 2026-06-02 00:00 |
04:08:42.57 |
-09:32:46.0 |
HIP 19448 |
19.46 |
| 2026-06-02 12:00 |
04:08:46.41 |
-09:32:44.4 |
HIP 19448 |
18.63 |
| 2026-06-03 00:00 |
04:08:50.25 |
-09:32:43.1 |
HIP 19448 |
17.80 |
| 2026-06-03 12:00 |
04:08:54.08 |
-09:32:42.0 |
HIP 19448 |
16.98 |
| 2026-06-04 00:00 |
04:08:57.90 |
-09:32:41.1 |
HIP 19448 |
16.17 |
| 2026-06-04 12:00 |
04:09:01.73 |
-09:32:40.5 |
HIP 19448 |
15.38 |
| 2026-06-05 00:00 |
04:09:05.55 |
-09:32:40.1 |
HIP 19448 |
14.61 |
| 2026-06-05 12:00 |
04:09:09.36 |
-09:32:40.0 |
HIP 19448 |
13.86 |
| 2026-06-06 00:00 |
04:09:13.17 |
-09:32:40.1 |
HIP 19448 |
13.13 |
| 2026-06-06 12:00 |
04:09:16.97 |
-09:32:40.4 |
HIP 19448 |
12.42 |
| 2026-06-07 00:00 |
04:09:20.77 |
-09:32:41.0 |
HIP 19448 |
11.75 |
| 2026-06-07 12:00 |
04:09:24.56 |
-09:32:41.8 |
HIP 19448 |
11.11 |
| 2026-06-08 00:00 |
04:09:28.34 |
-09:32:42.9 |
HIP 19448 |
10.51 |
| 2026-06-08 12:00 |
04:09:32.12 |
-09:32:44.2 |
HIP 19448 |
9.96 |
| 2026-06-09 00:00 |
04:09:35.89 |
-09:32:45.7 |
HIP 19448 |
9.47 |
| 2026-06-09 12:00 |
04:09:39.66 |
-09:32:47.5 |
HIP 19448 |
9.05 |
| 2026-06-10 00:00 |
04:09:43.41 |
-09:32:49.5 |
HIP 19448 |
8.70 |
| 2026-06-10 12:00 |
04:09:47.16 |
-09:32:51.8 |
HIP 19448 |
8.43 |
| 2026-06-11 00:00 |
04:09:50.91 |
-09:32:54.3 |
HIP 19448 |
8.26 |
| 2026-06-11 12:00 |
04:09:54.64 |
-09:32:57.1 |
HIP 19448 |
8.18 |
| 2026-06-12 00:00 |
04:09:58.37 |
-09:33:00.1 |
HIP 19448 |
8.21 |
| 2026-06-12 12:00 |
04:10:02.09 |
-09:33:03.3 |
HIP 19448 |
8.33 |
| 2026-06-13 00:00 |
04:10:05.80 |
-09:33:06.8 |
HIP 19448 |
8.54 |
| 2026-06-13 12:00 |
04:10:09.50 |
-09:33:10.5 |
HIP 19448 |
8.84 |
| 2026-06-14 00:00 |
04:10:13.19 |
-09:33:14.5 |
HIP 19448 |
9.22 |
| 2026-06-14 12:00 |
04:10:16.87 |
-09:33:18.7 |
HIP 19448 |
9.66 |
| 2026-06-15 00:00 |
04:10:20.55 |
-09:33:23.2 |
HIP 19448 |
10.16 |
| 2026-06-15 12:00 |
04:10:24.21 |
-09:33:27.9 |
HIP 19448 |
10.71 |
| 2026-06-16 00:00 |
04:10:27.87 |
-09:33:32.9 |
HIP 19448 |
11.30 |
| 2026-06-16 12:00 |
04:10:31.51 |
-09:33:38.1 |
HIP 19448 |
11.93 |
| 2026-06-17 00:00 |
04:10:35.14 |
-09:33:43.5 |
HIP 19448 |
12.58 |
| 2026-06-17 12:00 |
04:10:38.77 |
-09:33:49.2 |
HIP 19448 |
13.26 |
| 2026-06-18 00:00 |
04:10:42.38 |
-09:33:55.1 |
HIP 19448 |
13.96 |
| 2026-06-18 12:00 |
04:10:45.98 |
-09:34:01.3 |
HIP 19448 |
14.68 |
| 2026-06-19 00:00 |
04:10:49.57 |
-09:34:07.7 |
HIP 19448 |
15.41 |
| 2026-06-19 12:00 |
04:10:53.14 |
-09:34:14.4 |
HIP 19448 |
16.15 |
| 2026-06-20 00:00 |
04:10:56.71 |
-09:34:21.3 |
HIP 19448 |
16.91 |
| 2026-06-20 12:00 |
04:11:00.26 |
-09:34:28.4 |
HIP 19448 |
17.67 |
| 2026-06-21 00:00 |
04:11:03.81 |
-09:34:35.8 |
HIP 19448 |
18.44 |
| 2026-06-21 12:00 |
04:11:07.34 |
-09:34:43.4 |
HIP 19448 |
19.21 |
| 2026-06-22 00:00 |
04:11:10.85 |
-09:34:51.3 |
HIP 19448 |
19.99 |