메타데이터
| 항목 |
값 |
| Designation |
C/1999 E1 (Li) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-01-31T18:43:25.651200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
299 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1999-09-13.0000000 |
| e |
0.76010596 |
| q (au) |
3.920026 |
| a (au) |
16.340657 |
| i (deg) |
46.881232 |
| Ω (om, deg) |
127.834346 |
| ω (w, deg) |
329.768187 |
| M (ma, deg) |
3.345599 |
밝기
산란 + 전체 선형
$$
M_a = (9.991 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.991 |
| n |
2.000 |
| gf |
0.846 |
| gb |
-0.500 |
| k |
0.957 |
| 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 |
18:42:58.33 |
+03:42:51.2 |
HIP 91838 |
8.22 |
| 2026-06-01 12:00 |
18:42:54.96 |
+03:42:58.3 |
HIP 91838 |
8.89 |
| 2026-06-02 00:00 |
18:42:51.58 |
+03:43:05.2 |
HIP 91838 |
9.60 |
| 2026-06-02 12:00 |
18:42:48.18 |
+03:43:11.8 |
HIP 91838 |
10.33 |
| 2026-06-03 00:00 |
18:42:44.76 |
+03:43:18.2 |
HIP 91838 |
11.08 |
| 2026-06-03 12:00 |
18:42:41.33 |
+03:43:24.4 |
HIP 91838 |
11.86 |
| 2026-06-04 00:00 |
18:42:37.88 |
+03:43:30.4 |
HIP 91838 |
12.65 |
| 2026-06-04 12:00 |
18:42:34.41 |
+03:43:36.1 |
HIP 91838 |
13.45 |
| 2026-06-05 00:00 |
18:42:30.92 |
+03:43:41.6 |
HIP 91838 |
14.27 |
| 2026-06-05 12:00 |
18:42:27.42 |
+03:43:46.9 |
HIP 91838 |
15.10 |
| 2026-06-06 00:00 |
18:42:23.90 |
+03:43:51.9 |
HIP 91838 |
15.94 |
| 2026-06-06 12:00 |
18:42:20.36 |
+03:43:56.7 |
HIP 91838 |
16.79 |
| 2026-06-07 00:00 |
18:42:16.81 |
+03:44:01.2 |
HIP 91838 |
17.65 |
| 2026-06-07 12:00 |
18:42:13.24 |
+03:44:05.5 |
HIP 91705 |
18.05 |
| 2026-06-08 00:00 |
18:42:09.66 |
+03:44:09.6 |
HIP 91705 |
17.92 |
| 2026-06-08 12:00 |
18:42:06.06 |
+03:44:13.4 |
HIP 91705 |
17.84 |
| 2026-06-09 00:00 |
18:42:02.45 |
+03:44:17.0 |
HIP 91705 |
17.80 |
| 2026-06-09 12:00 |
18:41:58.82 |
+03:44:20.4 |
HIP 91705 |
17.82 |
| 2026-06-10 00:00 |
18:41:55.18 |
+03:44:23.5 |
HIP 91705 |
17.88 |
| 2026-06-10 12:00 |
18:41:51.53 |
+03:44:26.4 |
HIP 91705 |
18.00 |
| 2026-06-11 00:00 |
18:41:47.86 |
+03:44:29.0 |
HIP 91705 |
18.17 |
| 2026-06-11 12:00 |
18:41:44.18 |
+03:44:31.4 |
HIP 91705 |
18.38 |
| 2026-06-12 00:00 |
18:41:40.49 |
+03:44:33.6 |
HIP 91705 |
18.64 |
| 2026-06-12 12:00 |
18:41:36.78 |
+03:44:35.5 |
HIP 91705 |
18.95 |
| 2026-06-13 00:00 |
18:41:33.06 |
+03:44:37.1 |
HIP 91705 |
19.31 |
| 2026-06-13 12:00 |
18:41:29.33 |
+03:44:38.5 |
HIP 91705 |
19.70 |
| 2026-06-14 00:00 |
18:41:25.59 |
+03:44:39.7 |
HIP 91705 |
20.14 |
| 2026-06-14 12:00 |
18:41:21.84 |
+03:44:40.6 |
HIP 91705 |
20.61 |
| 2026-06-15 00:00 |
18:41:18.07 |
+03:44:41.3 |
HIP 91705 |
21.12 |
| 2026-06-15 12:00 |
18:41:14.30 |
+03:44:41.7 |
HIP 91705 |
21.67 |
| 2026-06-16 00:00 |
18:41:10.51 |
+03:44:41.9 |
HIP 91705 |
22.24 |
| 2026-06-16 12:00 |
18:41:06.72 |
+03:44:41.8 |
HIP 91705 |
22.85 |
| 2026-06-17 00:00 |
18:41:02.91 |
+03:44:41.5 |
HIP 91705 |
23.48 |
| 2026-06-17 12:00 |
18:40:59.10 |
+03:44:41.0 |
HIP 91705 |
24.13 |
| 2026-06-18 00:00 |
18:40:55.28 |
+03:44:40.1 |
HIP 91705 |
24.81 |
| 2026-06-18 12:00 |
18:40:51.45 |
+03:44:39.1 |
HIP 91705 |
25.52 |
| 2026-06-19 00:00 |
18:40:47.61 |
+03:44:37.8 |
HIP 91537 |
25.25 |
| 2026-06-19 12:00 |
18:40:43.76 |
+03:44:36.2 |
HIP 91537 |
24.83 |
| 2026-06-20 00:00 |
18:40:39.91 |
+03:44:34.4 |
HIP 91537 |
24.44 |
| 2026-06-20 12:00 |
18:40:36.05 |
+03:44:32.3 |
HIP 91537 |
24.08 |
| 2026-06-21 00:00 |
18:40:32.18 |
+03:44:30.0 |
HIP 91537 |
23.75 |
| 2026-06-21 12:00 |
18:40:28.31 |
+03:44:27.5 |
HIP 91537 |
23.45 |
| 2026-06-22 00:00 |
18:40:24.43 |
+03:44:24.7 |
HIP 91537 |
23.18 |