메타데이터
| 항목 |
값 |
| Designation |
P/2020 A4 (PANSTARRS-Lemmon) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-11-22T17:20:48.589440Z |
| Orbit solution date (soln_date, UTC) |
2022-08-07T20:12:03Z |
| Obs used |
106 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
8.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-01-01T12:06:58.176000Z |
| Discovery magnitude (MPC) |
21.40 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-02-03.0000000 |
| e |
0.65370445 |
| q (au) |
2.842514 |
| a (au) |
8.208347 |
| i (deg) |
24.990302 |
| Ω (om, deg) |
312.429623 |
| ω (w, deg) |
144.883054 |
| M (ma, deg) |
3.029158 |
밝기
산란 + 전체 선형
$$
M_a = (17.586 + 3.081\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.586 |
| n |
3.081 |
| gf |
1.000 |
| gb |
-0.590 |
| k |
0.800 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
17:02:50.81 |
-45:08:30.4 |
HIP 83368 |
14.66 |
| 2026-03-26 12:00 |
17:02:48.95 |
-45:09:19.1 |
HIP 83368 |
15.31 |
| 2026-03-27 00:00 |
17:02:46.96 |
-45:10:07.5 |
HIP 83427 |
14.79 |
| 2026-03-27 12:00 |
17:02:44.85 |
-45:10:55.7 |
HIP 83427 |
14.11 |
| 2026-03-28 00:00 |
17:02:42.62 |
-45:11:43.6 |
HIP 83427 |
13.46 |
| 2026-03-28 12:00 |
17:02:40.26 |
-45:12:31.3 |
HIP 83427 |
12.85 |
| 2026-03-29 00:00 |
17:02:37.77 |
-45:13:18.7 |
HIP 83427 |
12.28 |
| 2026-03-29 12:00 |
17:02:35.16 |
-45:14:05.9 |
HIP 83427 |
11.78 |
| 2026-03-30 00:00 |
17:02:32.43 |
-45:14:52.8 |
HIP 83427 |
11.34 |
| 2026-03-30 12:00 |
17:02:29.57 |
-45:15:39.4 |
HIP 83427 |
10.97 |
| 2026-03-31 00:00 |
17:02:26.59 |
-45:16:25.8 |
HIP 83427 |
10.70 |
| 2026-03-31 12:00 |
17:02:23.49 |
-45:17:11.9 |
HIP 83427 |
10.51 |
| 2026-04-01 00:00 |
17:02:20.26 |
-45:17:57.7 |
HIP 83427 |
10.43 |
| 2026-04-01 12:00 |
17:02:16.91 |
-45:18:43.2 |
HIP 83427 |
10.46 |
| 2026-04-02 00:00 |
17:02:13.43 |
-45:19:28.5 |
HIP 83427 |
10.59 |
| 2026-04-02 12:00 |
17:02:09.83 |
-45:20:13.4 |
HIP 83427 |
10.83 |
| 2026-04-03 00:00 |
17:02:06.11 |
-45:20:58.1 |
HIP 83427 |
11.17 |
| 2026-04-03 12:00 |
17:02:02.27 |
-45:21:42.4 |
HIP 83427 |
11.62 |
| 2026-04-04 00:00 |
17:01:58.30 |
-45:22:26.4 |
HIP 83427 |
12.14 |
| 2026-04-04 12:00 |
17:01:54.22 |
-45:23:10.2 |
HIP 83427 |
12.75 |
| 2026-04-05 00:00 |
17:01:50.01 |
-45:23:53.6 |
HIP 83427 |
13.43 |
| 2026-04-05 12:00 |
17:01:45.68 |
-45:24:36.6 |
HIP 83230 |
13.10 |
| 2026-04-06 00:00 |
17:01:41.23 |
-45:25:19.4 |
HIP 83230 |
12.21 |
| 2026-04-06 12:00 |
17:01:36.66 |
-45:26:01.8 |
HIP 83230 |
11.33 |
| 2026-04-07 00:00 |
17:01:31.97 |
-45:26:43.8 |
HIP 83230 |
10.46 |
| 2026-04-07 12:00 |
17:01:27.16 |
-45:27:25.5 |
HIP 83230 |
9.61 |
| 2026-04-08 00:00 |
17:01:22.23 |
-45:28:06.9 |
HIP 83230 |
8.80 |
| 2026-04-08 12:00 |
17:01:17.18 |
-45:28:47.9 |
HIP 83230 |
8.04 |
| 2026-04-09 00:00 |
17:01:12.01 |
-45:29:28.6 |
HIP 83230 |
7.34 |
| 2026-04-09 12:00 |
17:01:06.72 |
-45:30:08.8 |
HIP 83230 |
6.75 |
| 2026-04-10 00:00 |
17:01:01.31 |
-45:30:48.8 |
HIP 83230 |
6.28 |
| 2026-04-10 12:00 |
17:00:55.79 |
-45:31:28.3 |
HIP 83230 |
5.99 |
| 2026-04-11 00:00 |
17:00:50.15 |
-45:32:07.4 |
HIP 83230 |
5.91 |
| 2026-04-11 12:00 |
17:00:44.39 |
-45:32:46.2 |
HIP 83230 |
6.04 |
| 2026-04-12 00:00 |
17:00:38.52 |
-45:33:24.6 |
HIP 83230 |
6.40 |
| 2026-04-12 12:00 |
17:00:32.53 |
-45:34:02.5 |
HIP 83230 |
6.94 |
| 2026-04-13 00:00 |
17:00:26.42 |
-45:34:40.1 |
HIP 83230 |
7.63 |
| 2026-04-13 12:00 |
17:00:20.20 |
-45:35:17.3 |
HIP 83230 |
8.46 |
| 2026-04-14 00:00 |
17:00:13.87 |
-45:35:54.0 |
HIP 83230 |
9.37 |
| 2026-04-14 12:00 |
17:00:07.42 |
-45:36:30.3 |
HIP 83230 |
10.37 |
| 2026-04-15 00:00 |
17:00:00.85 |
-45:37:06.2 |
HIP 83230 |
11.42 |
| 2026-04-15 12:00 |
16:59:54.18 |
-45:37:41.7 |
HIP 83230 |
12.52 |
| 2026-04-16 00:00 |
16:59:47.39 |
-45:38:16.8 |
HIP 83230 |
13.67 |