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) |
| 2026-07-29 00:00 |
03:35:19.05 |
-00:19:05.3 |
HIP 16600 |
25.04 |
| 2026-07-29 12:00 |
03:35:21.71 |
-00:19:22.5 |
HIP 16727 |
25.04 |
| 2026-07-30 00:00 |
03:35:24.32 |
-00:19:39.9 |
HIP 16727 |
24.82 |
| 2026-07-30 12:00 |
03:35:26.88 |
-00:19:57.6 |
HIP 16727 |
24.61 |
| 2026-07-31 00:00 |
03:35:29.40 |
-00:20:15.6 |
HIP 16727 |
24.41 |
| 2026-07-31 12:00 |
03:35:31.86 |
-00:20:33.8 |
HIP 16873 |
24.04 |
| 2026-08-01 00:00 |
03:35:34.28 |
-00:20:52.3 |
HIP 16873 |
23.43 |
| 2026-08-01 12:00 |
03:35:36.66 |
-00:21:11.1 |
HIP 16873 |
22.83 |
| 2026-08-02 00:00 |
03:35:38.98 |
-00:21:30.1 |
HIP 16873 |
22.25 |
| 2026-08-02 12:00 |
03:35:41.26 |
-00:21:49.4 |
HIP 16873 |
21.69 |
| 2026-08-03 00:00 |
03:35:43.49 |
-00:22:08.9 |
HIP 16873 |
21.15 |
| 2026-08-03 12:00 |
03:35:45.67 |
-00:22:28.7 |
HIP 16873 |
20.62 |
| 2026-08-04 00:00 |
03:35:47.80 |
-00:22:48.8 |
HIP 16873 |
20.11 |
| 2026-08-04 12:00 |
03:35:49.88 |
-00:23:09.1 |
HIP 16873 |
19.62 |
| 2026-08-05 00:00 |
03:35:51.91 |
-00:23:29.6 |
HIP 16873 |
19.15 |
| 2026-08-05 12:00 |
03:35:53.90 |
-00:23:50.4 |
HIP 16873 |
18.70 |
| 2026-08-06 00:00 |
03:35:55.83 |
-00:24:11.5 |
HIP 16873 |
18.28 |
| 2026-08-06 12:00 |
03:35:57.72 |
-00:24:32.8 |
HIP 16873 |
17.87 |
| 2026-08-07 00:00 |
03:35:59.55 |
-00:24:54.3 |
HIP 16873 |
17.49 |
| 2026-08-07 12:00 |
03:36:01.34 |
-00:25:16.1 |
HIP 16873 |
17.14 |
| 2026-08-08 00:00 |
03:36:03.07 |
-00:25:38.1 |
HIP 16873 |
16.81 |
| 2026-08-08 12:00 |
03:36:04.76 |
-00:26:00.4 |
HIP 16873 |
16.51 |
| 2026-08-09 00:00 |
03:36:06.39 |
-00:26:22.9 |
HIP 16873 |
16.23 |
| 2026-08-09 12:00 |
03:36:07.97 |
-00:26:45.7 |
HIP 16873 |
15.98 |
| 2026-08-10 00:00 |
03:36:09.51 |
-00:27:08.7 |
HIP 16873 |
15.76 |
| 2026-08-10 12:00 |
03:36:10.99 |
-00:27:31.9 |
HIP 16873 |
15.57 |
| 2026-08-11 00:00 |
03:36:12.42 |
-00:27:55.4 |
HIP 16873 |
15.41 |
| 2026-08-11 12:00 |
03:36:13.80 |
-00:28:19.0 |
HIP 16873 |
15.27 |
| 2026-08-12 00:00 |
03:36:15.13 |
-00:28:43.0 |
HIP 16873 |
15.17 |
| 2026-08-12 12:00 |
03:36:16.41 |
-00:29:07.1 |
HIP 16873 |
15.10 |
| 2026-08-13 00:00 |
03:36:17.63 |
-00:29:31.5 |
HIP 16873 |
15.06 |
| 2026-08-13 12:00 |
03:36:18.80 |
-00:29:56.1 |
HIP 16873 |
15.05 |
| 2026-08-14 00:00 |
03:36:19.93 |
-00:30:20.9 |
HIP 16873 |
15.06 |
| 2026-08-14 12:00 |
03:36:21.00 |
-00:30:46.0 |
HIP 16873 |
15.11 |
| 2026-08-15 00:00 |
03:36:22.01 |
-00:31:11.2 |
HIP 16873 |
15.18 |
| 2026-08-15 12:00 |
03:36:22.98 |
-00:31:36.7 |
HIP 16873 |
15.29 |
| 2026-08-16 00:00 |
03:36:23.89 |
-00:32:02.4 |
HIP 16873 |
15.41 |
| 2026-08-16 12:00 |
03:36:24.75 |
-00:32:28.3 |
HIP 16873 |
15.57 |
| 2026-08-17 00:00 |
03:36:25.56 |
-00:32:54.4 |
HIP 16873 |
15.75 |
| 2026-08-17 12:00 |
03:36:26.32 |
-00:33:20.7 |
HIP 16873 |
15.95 |
| 2026-08-18 00:00 |
03:36:27.03 |
-00:33:47.2 |
HIP 16873 |
16.18 |
| 2026-08-18 12:00 |
03:36:27.68 |
-00:34:13.9 |
HIP 16873 |
16.42 |
| 2026-08-19 00:00 |
03:36:28.28 |
-00:34:40.8 |
HIP 16873 |
16.69 |