메타데이터
| 항목 |
값 |
| Designation |
C/2019 J1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-09T08:09:59.362560Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:30Z |
| Obs used |
192 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-05-04T10:44:49.920000Z |
| Discovery magnitude (MPC) |
17.40 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-06-18.0000000 |
| e |
0.96535584 |
| q (au) |
2.478657 |
| a (au) |
71.546171 |
| i (deg) |
24.549745 |
| Ω (om, deg) |
98.087033 |
| ω (w, deg) |
167.794427 |
| M (ma, deg) |
0.113450 |
밝기
산란 + 전체 선형
$$
M_a = (11.407 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.407 |
| n |
6.000 |
| gf |
0.982 |
| gb |
-0.650 |
| k |
0.897 |
| δ90 |
9.997 |
| 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) |
| 2026-09-20 00:00 |
03:35:17.64 |
-01:08:28.8 |
HIP 16727 |
24.19 |
| 2026-09-20 12:00 |
03:35:14.88 |
-01:09:03.4 |
HIP 16727 |
24.74 |
| 2026-09-21 00:00 |
03:35:12.07 |
-01:09:37.9 |
HIP 16727 |
25.32 |
| 2026-09-21 12:00 |
03:35:09.21 |
-01:10:12.5 |
HIP 16727 |
25.91 |
| 2026-09-22 00:00 |
03:35:06.30 |
-01:10:47.1 |
HIP 16727 |
26.52 |
| 2026-09-22 12:00 |
03:35:03.35 |
-01:11:21.7 |
HIP 16727 |
27.15 |
| 2026-09-23 00:00 |
03:35:00.35 |
-01:11:56.3 |
HIP 16727 |
27.80 |
| 2026-09-23 12:00 |
03:34:57.30 |
-01:12:30.9 |
HIP 16727 |
28.46 |
| 2026-09-24 00:00 |
03:34:54.21 |
-01:13:05.5 |
HIP 16543 |
28.01 |
| 2026-09-24 12:00 |
03:34:51.07 |
-01:13:40.1 |
HIP 16543 |
27.14 |
| 2026-09-25 00:00 |
03:34:47.88 |
-01:14:14.7 |
HIP 16543 |
26.27 |
| 2026-09-25 12:00 |
03:34:44.65 |
-01:14:49.3 |
HIP 16578 |
25.36 |
| 2026-09-26 00:00 |
03:34:41.37 |
-01:15:23.9 |
HIP 16578 |
24.36 |
| 2026-09-26 12:00 |
03:34:38.05 |
-01:15:58.5 |
HIP 16578 |
23.35 |
| 2026-09-27 00:00 |
03:34:34.69 |
-01:16:33.0 |
HIP 16578 |
22.33 |
| 2026-09-27 12:00 |
03:34:31.27 |
-01:17:07.6 |
HIP 16578 |
21.31 |
| 2026-09-28 00:00 |
03:34:27.82 |
-01:17:42.1 |
HIP 16578 |
20.27 |
| 2026-09-28 12:00 |
03:34:24.32 |
-01:18:16.6 |
HIP 16578 |
19.23 |
| 2026-09-29 00:00 |
03:34:20.78 |
-01:18:51.0 |
HIP 16578 |
18.18 |
| 2026-09-29 12:00 |
03:34:17.19 |
-01:19:25.5 |
HIP 16578 |
17.13 |
| 2026-09-30 00:00 |
03:34:13.56 |
-01:19:59.9 |
HIP 16578 |
16.06 |
| 2026-09-30 12:00 |
03:34:09.89 |
-01:20:34.2 |
HIP 16578 |
14.99 |
| 2026-10-01 00:00 |
03:34:06.17 |
-01:21:08.5 |
HIP 16578 |
13.92 |
| 2026-10-01 12:00 |
03:34:02.42 |
-01:21:42.8 |
HIP 16578 |
12.84 |
| 2026-10-02 00:00 |
03:33:58.61 |
-01:22:17.0 |
HIP 16578 |
11.76 |
| 2026-10-02 12:00 |
03:33:54.77 |
-01:22:51.2 |
HIP 16578 |
10.67 |
| 2026-10-03 00:00 |
03:33:50.89 |
-01:23:25.3 |
HIP 16578 |
9.59 |
| 2026-10-03 12:00 |
03:33:46.96 |
-01:23:59.4 |
HIP 16578 |
8.51 |
| 2026-10-04 00:00 |
03:33:43.00 |
-01:24:33.4 |
HIP 16578 |
7.44 |
| 2026-10-04 12:00 |
03:33:38.99 |
-01:25:07.3 |
HIP 16578 |
6.40 |
| 2026-10-05 00:00 |
03:33:34.94 |
-01:25:41.2 |
HIP 16578 |
5.39 |
| 2026-10-05 12:00 |
03:33:30.85 |
-01:26:15.0 |
HIP 16578 |
4.45 |
| 2026-10-06 00:00 |
03:33:26.73 |
-01:26:48.7 |
HIP 16578 |
3.65 |
| 2026-10-06 12:00 |
03:33:22.56 |
-01:27:22.4 |
HIP 16578 |
3.10 |
| 2026-10-07 00:00 |
03:33:18.35 |
-01:27:55.9 |
HIP 16578 |
2.95 |
| 2026-10-07 12:00 |
03:33:14.11 |
-01:28:29.4 |
HIP 16578 |
3.27 |
| 2026-10-08 00:00 |
03:33:09.83 |
-01:29:02.8 |
HIP 16578 |
3.96 |
| 2026-10-08 12:00 |
03:33:05.51 |
-01:29:36.1 |
HIP 16578 |
4.86 |
| 2026-10-09 00:00 |
03:33:01.15 |
-01:30:09.3 |
HIP 16578 |
5.88 |
| 2026-10-09 12:00 |
03:32:56.75 |
-01:30:42.4 |
HIP 16578 |
6.98 |
| 2026-10-10 00:00 |
03:32:52.32 |
-01:31:15.4 |
HIP 16578 |
8.13 |
| 2026-10-10 12:00 |
03:32:47.85 |
-01:31:48.3 |
HIP 16519 |
8.39 |
| 2026-10-11 00:00 |
03:32:43.35 |
-01:32:21.0 |
HIP 16519 |
7.72 |