메타데이터
| 항목 |
값 |
| Designation |
C/2024 J4 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-04-26T00:07:36.373440Z |
| Orbit solution date (soln_date, UTC) |
2026-08-07T12:42:14Z |
| Obs used |
876 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-05-11T09:58:56.611200Z |
| Discovery magnitude (MPC) |
20.17 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-06-22.0000000 |
| e |
0.99909687 |
| q (au) |
5.695127 |
| a (au) |
6305.992193 |
| i (deg) |
117.529889 |
| Ω (om, deg) |
19.306009 |
| ω (w, deg) |
127.858498 |
| M (ma, deg) |
0.000112 |
밝기
산란 + 전체 선형
$$
M_a = (3.371 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.371 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.979 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
13:15:19.27 |
-03:21:18.4 |
HIP 64721 |
17.41 |
| 2026-09-20 12:00 |
13:15:26.75 |
-03:24:00.7 |
HIP 64721 |
18.89 |
| 2026-09-21 00:00 |
13:15:34.26 |
-03:26:43.0 |
HIP 64721 |
20.79 |
| 2026-09-21 12:00 |
13:15:41.81 |
-03:29:25.1 |
HIP 64721 |
23.00 |
| 2026-09-22 00:00 |
13:15:49.40 |
-03:32:07.2 |
HIP 64731 |
22.50 |
| 2026-09-22 12:00 |
13:15:57.02 |
-03:34:49.2 |
HIP 64731 |
19.60 |
| 2026-09-23 00:00 |
13:16:04.68 |
-03:37:31.1 |
HIP 64731 |
16.85 |
| 2026-09-23 12:00 |
13:16:12.37 |
-03:40:12.9 |
HIP 64731 |
14.34 |
| 2026-09-24 00:00 |
13:16:20.10 |
-03:42:54.6 |
HIP 64731 |
12.23 |
| 2026-09-24 12:00 |
13:16:27.86 |
-03:45:36.3 |
HIP 64731 |
10.74 |
| 2026-09-25 00:00 |
13:16:35.65 |
-03:48:17.9 |
HIP 64731 |
10.16 |
| 2026-09-25 12:00 |
13:16:43.47 |
-03:50:59.4 |
HIP 64731 |
10.65 |
| 2026-09-26 00:00 |
13:16:51.32 |
-03:53:40.7 |
HIP 64731 |
12.07 |
| 2026-09-26 12:00 |
13:16:59.20 |
-03:56:22.0 |
HIP 64731 |
14.16 |
| 2026-09-27 00:00 |
13:17:07.12 |
-03:59:03.2 |
HIP 64731 |
16.67 |
| 2026-09-27 12:00 |
13:17:15.06 |
-04:01:44.4 |
HIP 64731 |
19.43 |
| 2026-09-28 00:00 |
13:17:23.02 |
-04:04:25.4 |
HIP 64731 |
22.35 |
| 2026-09-28 12:00 |
13:17:31.02 |
-04:07:06.3 |
HIP 64731 |
25.38 |
| 2026-09-29 00:00 |
13:17:39.03 |
-04:09:47.1 |
HIP 64731 |
28.49 |
| 2026-09-29 12:00 |
13:17:47.08 |
-04:12:27.8 |
HIP 64731 |
31.64 |
| 2026-09-30 00:00 |
13:17:55.15 |
-04:15:08.4 |
HIP 64811 |
31.50 |
| 2026-09-30 12:00 |
13:18:03.24 |
-04:17:48.9 |
HIP 64811 |
30.11 |
| 2026-10-01 00:00 |
13:18:11.36 |
-04:20:29.3 |
HIP 64811 |
29.05 |
| 2026-10-01 12:00 |
13:18:19.50 |
-04:23:09.6 |
HIP 64811 |
28.35 |
| 2026-10-02 00:00 |
13:18:27.66 |
-04:25:49.8 |
HIP 64811 |
28.04 |
| 2026-10-02 12:00 |
13:18:35.84 |
-04:28:29.9 |
HIP 64811 |
28.14 |
| 2026-10-03 00:00 |
13:18:44.04 |
-04:31:09.8 |
HIP 64811 |
28.63 |
| 2026-10-03 12:00 |
13:18:52.26 |
-04:33:49.7 |
HIP 64811 |
29.51 |
| 2026-10-04 00:00 |
13:19:00.50 |
-04:36:29.4 |
HIP 64811 |
30.74 |
| 2026-10-04 12:00 |
13:19:08.76 |
-04:39:09.0 |
HIP 64811 |
32.28 |
| 2026-10-05 00:00 |
13:19:17.04 |
-04:41:48.5 |
HIP 64811 |
34.08 |
| 2026-10-05 12:00 |
13:19:25.33 |
-04:44:27.8 |
HIP 64811 |
36.12 |
| 2026-10-06 00:00 |
13:19:33.63 |
-04:47:07.0 |
HIP 64811 |
38.34 |
| 2026-10-06 12:00 |
13:19:41.95 |
-04:49:46.1 |
HIP 65243 |
38.57 |
| 2026-10-07 00:00 |
13:19:50.29 |
-04:52:25.1 |
HIP 65243 |
37.38 |
| 2026-10-07 12:00 |
13:19:58.64 |
-04:55:03.9 |
HIP 65243 |
36.46 |
| 2026-10-08 00:00 |
13:20:07.00 |
-04:57:42.6 |
HIP 65243 |
35.82 |
| 2026-10-08 12:00 |
13:20:15.37 |
-05:00:21.2 |
HIP 65243 |
35.50 |
| 2026-10-09 00:00 |
13:20:23.75 |
-05:02:59.6 |
HIP 65243 |
35.49 |
| 2026-10-09 12:00 |
13:20:32.14 |
-05:05:37.9 |
HIP 65148 |
35.03 |
| 2026-10-10 00:00 |
13:20:40.54 |
-05:08:16.0 |
HIP 65148 |
32.06 |
| 2026-10-10 12:00 |
13:20:48.94 |
-05:10:54.0 |
HIP 65148 |
29.18 |
| 2026-10-11 00:00 |
13:20:57.36 |
-05:13:31.8 |
HIP 65148 |
26.42 |