메타데이터
| 항목 |
값 |
| Designation |
C/2017 F1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-30T23:48:42.943680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:32Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
13.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-06-10.0000000 |
| e |
1.00410815 |
| q (au) |
4.499798 |
| a (au) |
-1095.333743 |
| i (deg) |
146.479803 |
| Ω (om, deg) |
158.739539 |
| ω (w, deg) |
64.812799 |
| M (ma, deg) |
-0.004731 |
밝기
산란 + 전체 선형
$$
M_a = (6.500 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.500 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.663 |
| 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) |
| 2026-05-12 00:00 |
22:34:15.13 |
-13:32:32.2 |
HIP 111234 |
30.73 |
| 2026-05-12 12:00 |
22:34:16.10 |
-13:32:41.2 |
HIP 111234 |
30.95 |
| 2026-05-13 00:00 |
22:34:17.04 |
-13:32:50.5 |
HIP 111234 |
31.16 |
| 2026-05-13 12:00 |
22:34:17.92 |
-13:33:00.1 |
HIP 111234 |
31.36 |
| 2026-05-14 00:00 |
22:34:18.76 |
-13:33:09.9 |
HIP 111234 |
31.55 |
| 2026-05-14 12:00 |
22:34:19.56 |
-13:33:20.1 |
HIP 111234 |
31.73 |
| 2026-05-15 00:00 |
22:34:20.31 |
-13:33:30.6 |
HIP 111234 |
31.90 |
| 2026-05-15 12:00 |
22:34:21.01 |
-13:33:41.3 |
HIP 111234 |
32.05 |
| 2026-05-16 00:00 |
22:34:21.67 |
-13:33:52.4 |
HIP 111234 |
32.20 |
| 2026-05-16 12:00 |
22:34:22.28 |
-13:34:03.7 |
HIP 111234 |
32.34 |
| 2026-05-17 00:00 |
22:34:22.84 |
-13:34:15.3 |
HIP 111234 |
32.46 |
| 2026-05-17 12:00 |
22:34:23.36 |
-13:34:27.2 |
HIP 111234 |
32.58 |
| 2026-05-18 00:00 |
22:34:23.83 |
-13:34:39.4 |
HIP 111234 |
32.69 |
| 2026-05-18 12:00 |
22:34:24.25 |
-13:34:51.9 |
HIP 111234 |
32.78 |
| 2026-05-19 00:00 |
22:34:24.63 |
-13:35:04.7 |
HIP 111234 |
32.87 |
| 2026-05-19 12:00 |
22:34:24.95 |
-13:35:17.8 |
HIP 111234 |
32.94 |
| 2026-05-20 00:00 |
22:34:25.24 |
-13:35:31.2 |
HIP 111234 |
33.01 |
| 2026-05-20 12:00 |
22:34:25.47 |
-13:35:44.8 |
HIP 111234 |
33.06 |
| 2026-05-21 00:00 |
22:34:25.66 |
-13:35:58.8 |
HIP 111234 |
33.11 |
| 2026-05-21 12:00 |
22:34:25.80 |
-13:36:13.0 |
HIP 111234 |
33.14 |
| 2026-05-22 00:00 |
22:34:25.89 |
-13:36:27.5 |
HIP 111234 |
33.17 |
| 2026-05-22 12:00 |
22:34:25.94 |
-13:36:42.4 |
HIP 111234 |
33.19 |
| 2026-05-23 00:00 |
22:34:25.94 |
-13:36:57.5 |
HIP 111234 |
33.19 |
| 2026-05-23 12:00 |
22:34:25.89 |
-13:37:12.9 |
HIP 111234 |
33.19 |
| 2026-05-24 00:00 |
22:34:25.79 |
-13:37:28.6 |
HIP 111234 |
33.18 |
| 2026-05-24 12:00 |
22:34:25.64 |
-13:37:44.6 |
HIP 111234 |
33.16 |
| 2026-05-25 00:00 |
22:34:25.45 |
-13:38:00.8 |
HIP 111234 |
33.13 |
| 2026-05-25 12:00 |
22:34:25.21 |
-13:38:17.4 |
HIP 111234 |
33.09 |
| 2026-05-26 00:00 |
22:34:24.92 |
-13:38:34.3 |
HIP 111234 |
33.04 |
| 2026-05-26 12:00 |
22:34:24.59 |
-13:38:51.4 |
HIP 111234 |
32.98 |
| 2026-05-27 00:00 |
22:34:24.20 |
-13:39:08.8 |
HIP 111234 |
32.92 |
| 2026-05-27 12:00 |
22:34:23.77 |
-13:39:26.5 |
HIP 111234 |
32.84 |
| 2026-05-28 00:00 |
22:34:23.29 |
-13:39:44.5 |
HIP 111234 |
32.76 |
| 2026-05-28 12:00 |
22:34:22.77 |
-13:40:02.8 |
HIP 111234 |
32.67 |
| 2026-05-29 00:00 |
22:34:22.19 |
-13:40:21.4 |
HIP 111234 |
32.57 |
| 2026-05-29 12:00 |
22:34:21.57 |
-13:40:40.2 |
HIP 111234 |
32.47 |
| 2026-05-30 00:00 |
22:34:20.90 |
-13:40:59.4 |
HIP 111234 |
32.36 |
| 2026-05-30 12:00 |
22:34:20.18 |
-13:41:18.8 |
HIP 111234 |
32.24 |
| 2026-05-31 00:00 |
22:34:19.41 |
-13:41:38.5 |
HIP 111234 |
32.11 |
| 2026-05-31 12:00 |
22:34:18.60 |
-13:41:58.5 |
HIP 111234 |
31.98 |
| 2026-06-01 00:00 |
22:34:17.74 |
-13:42:18.8 |
HIP 111234 |
31.84 |
| 2026-06-01 12:00 |
22:34:16.83 |
-13:42:39.4 |
HIP 111234 |
31.69 |
| 2026-06-02 00:00 |
22:34:15.87 |
-13:43:00.2 |
HIP 111234 |
31.54 |