C/2019 U6 (Lemmon)
메타데이터
| 항목 |
값 |
| Designation |
C/2019 U6 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-06-18T19:43:24.988800Z |
| Orbit solution date (soln_date, UTC) |
2022-04-16T22:12:22Z |
| Obs used |
1144 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
7.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-10-31T10:24:29.952000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-04-28.0000000 |
| e |
0.99790319 |
| q (au) |
0.914264 |
| a (au) |
436.025928 |
| i (deg) |
61.001339 |
| Ω (om, deg) |
235.705755 |
| ω (w, deg) |
329.659058 |
| M (ma, deg) |
359.994390 |
밝기
산란 + 전체 선형
$$
M_a = (8.998 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.998 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2018-11-06 |
2020-01-26 |
-9.9490 |
+4.967 |
| 2020-01-26 |
2020-04-22 |
+11.1473 |
-3.130 |
| 2020-04-22 |
2020-06-18 |
-1.0370 |
-2.413 |
| 2020-06-18 |
2020-07-26 |
+16.3476 |
-0.540 |
| 2020-07-26 |
2020-11-28 |
-5.2648 |
+1.320 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:17:23.80 |
+46:57:20.8 |
HIP 114928 |
10.45 |
| 2026-02-03 12:00 |
23:17:32.45 |
+46:56:55.3 |
HIP 114928 |
11.13 |
| 2026-02-04 00:00 |
23:17:41.13 |
+46:56:30.5 |
HIP 115069 |
11.58 |
| 2026-02-04 12:00 |
23:17:49.85 |
+46:56:06.4 |
HIP 115069 |
10.36 |
| 2026-02-05 00:00 |
23:17:58.60 |
+46:55:42.9 |
HIP 115069 |
9.24 |
| 2026-02-05 12:00 |
23:18:07.39 |
+46:55:20.2 |
HIP 115069 |
8.27 |
| 2026-02-06 00:00 |
23:18:16.21 |
+46:54:58.2 |
HIP 115069 |
7.51 |
| 2026-02-06 12:00 |
23:18:25.06 |
+46:54:36.9 |
HIP 115069 |
7.03 |
| 2026-02-07 00:00 |
23:18:33.95 |
+46:54:16.3 |
HIP 115069 |
6.88 |
| 2026-02-07 12:00 |
23:18:42.86 |
+46:53:56.3 |
HIP 115069 |
7.10 |
| 2026-02-08 00:00 |
23:18:51.81 |
+46:53:37.1 |
HIP 115069 |
7.65 |
| 2026-02-08 12:00 |
23:19:00.79 |
+46:53:18.6 |
HIP 115069 |
8.47 |
| 2026-02-09 00:00 |
23:19:09.81 |
+46:53:00.8 |
HIP 115069 |
9.48 |
| 2026-02-09 12:00 |
23:19:18.85 |
+46:52:43.6 |
HIP 115069 |
10.65 |
| 2026-02-10 00:00 |
23:19:27.92 |
+46:52:27.2 |
HIP 115083 |
11.77 |
| 2026-02-10 12:00 |
23:19:37.02 |
+46:52:11.5 |
HIP 115083 |
12.90 |
| 2026-02-11 00:00 |
23:19:46.15 |
+46:51:56.4 |
HIP 115083 |
14.12 |
| 2026-02-11 12:00 |
23:19:55.30 |
+46:51:42.1 |
HIP 115083 |
15.43 |
| 2026-02-12 00:00 |
23:20:04.49 |
+46:51:28.5 |
HIP 115083 |
16.78 |
| 2026-02-12 12:00 |
23:20:13.70 |
+46:51:15.5 |
HIP 115083 |
18.19 |
| 2026-02-13 00:00 |
23:20:22.93 |
+46:51:03.3 |
HIP 115083 |
19.63 |
| 2026-02-13 12:00 |
23:20:32.20 |
+46:50:51.8 |
HIP 115083 |
21.10 |
| 2026-02-14 00:00 |
23:20:41.49 |
+46:50:40.9 |
HIP 115083 |
22.59 |
| 2026-02-14 12:00 |
23:20:50.80 |
+46:50:30.8 |
HIP 115083 |
24.11 |
| 2026-02-15 00:00 |
23:21:00.14 |
+46:50:21.4 |
HIP 115083 |
25.64 |
| 2026-02-15 12:00 |
23:21:09.50 |
+46:50:12.6 |
HIP 115083 |
27.18 |
| 2026-02-16 00:00 |
23:21:18.88 |
+46:50:04.6 |
HIP 115083 |
28.74 |
| 2026-02-16 12:00 |
23:21:28.29 |
+46:49:57.2 |
HIP 115083 |
30.31 |
| 2026-02-17 00:00 |
23:21:37.71 |
+46:49:50.6 |
HIP 115334 |
31.23 |
| 2026-02-17 12:00 |
23:21:47.16 |
+46:49:44.6 |
HIP 115334 |
31.36 |
| 2026-02-18 00:00 |
23:21:56.63 |
+46:49:39.3 |
HIP 115334 |
31.56 |
| 2026-02-18 12:00 |
23:22:06.12 |
+46:49:34.7 |
HIP 115334 |
31.83 |
| 2026-02-19 00:00 |
23:22:15.63 |
+46:49:30.8 |
HIP 115487 |
31.00 |
| 2026-02-19 12:00 |
23:22:25.16 |
+46:49:27.6 |
HIP 115487 |
30.23 |
| 2026-02-20 00:00 |
23:22:34.71 |
+46:49:25.1 |
HIP 115487 |
29.53 |
| 2026-02-20 12:00 |
23:22:44.27 |
+46:49:23.3 |
HIP 115487 |
28.92 |
| 2026-02-21 00:00 |
23:22:53.86 |
+46:49:22.1 |
HIP 115487 |
28.40 |
| 2026-02-21 12:00 |
23:23:03.45 |
+46:49:21.7 |
HIP 115487 |
27.98 |
| 2026-02-22 00:00 |
23:23:13.07 |
+46:49:21.9 |
HIP 115487 |
27.66 |
| 2026-02-22 12:00 |
23:23:22.70 |
+46:49:22.8 |
HIP 115487 |
27.44 |
| 2026-02-23 00:00 |
23:23:32.34 |
+46:49:24.3 |
HIP 115487 |
27.34 |
| 2026-02-23 12:00 |
23:23:42.00 |
+46:49:26.6 |
HIP 115608 |
26.78 |
| 2026-02-24 00:00 |
23:23:51.68 |
+46:49:29.5 |
HIP 115608 |
25.85 |