메타데이터
| 항목 |
값 |
| Designation |
C/2020 P3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-20T20:06:04.121280Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:18Z |
| Obs used |
698 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-08-09T13:40:41.433600Z |
| Discovery magnitude (MPC) |
19.01 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-07-14.0000000 |
| e |
0.99914404 |
| q (au) |
6.812376 |
| a (au) |
7958.786111 |
| i (deg) |
61.884995 |
| Ω (om, deg) |
19.484342 |
| ω (w, deg) |
82.246067 |
| M (ma, deg) |
0.000117 |
밝기
산란 + 전체 선형
$$
M_a = (7.781 + 5.487\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.781 |
| n |
5.487 |
| gf |
0.998 |
| gb |
-0.906 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2021-05-24 |
2024-04-12 |
+10.1458 |
-9.061 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
13:03:34.65 |
-00:21:46.1 |
HIP 63803 |
27.12 |
| 2026-09-20 12:00 |
13:03:41.90 |
-00:23:05.8 |
HIP 63803 |
24.99 |
| 2026-09-21 00:00 |
13:03:49.16 |
-00:24:25.5 |
HIP 63803 |
22.88 |
| 2026-09-21 12:00 |
13:03:56.44 |
-00:25:45.2 |
HIP 63803 |
20.80 |
| 2026-09-22 00:00 |
13:04:03.73 |
-00:27:04.8 |
HIP 63803 |
18.75 |
| 2026-09-22 12:00 |
13:04:11.04 |
-00:28:24.4 |
HIP 63803 |
16.76 |
| 2026-09-23 00:00 |
13:04:18.37 |
-00:29:43.9 |
HIP 63803 |
14.84 |
| 2026-09-23 12:00 |
13:04:25.71 |
-00:31:03.5 |
HIP 63803 |
13.04 |
| 2026-09-24 00:00 |
13:04:33.06 |
-00:32:22.9 |
HIP 63803 |
11.40 |
| 2026-09-24 12:00 |
13:04:40.43 |
-00:33:42.4 |
HIP 63803 |
10.00 |
| 2026-09-25 00:00 |
13:04:47.81 |
-00:35:01.7 |
HIP 63803 |
8.97 |
| 2026-09-25 12:00 |
13:04:55.20 |
-00:36:21.1 |
HIP 63803 |
8.45 |
| 2026-09-26 00:00 |
13:05:02.61 |
-00:37:40.4 |
HIP 63803 |
8.52 |
| 2026-09-26 12:00 |
13:05:10.03 |
-00:38:59.6 |
HIP 63803 |
9.17 |
| 2026-09-27 00:00 |
13:05:17.46 |
-00:40:18.8 |
HIP 63803 |
10.30 |
| 2026-09-27 12:00 |
13:05:24.90 |
-00:41:37.9 |
HIP 63803 |
11.78 |
| 2026-09-28 00:00 |
13:05:32.36 |
-00:42:57.0 |
HIP 63803 |
13.48 |
| 2026-09-28 12:00 |
13:05:39.82 |
-00:44:16.0 |
HIP 63803 |
15.33 |
| 2026-09-29 00:00 |
13:05:47.29 |
-00:45:34.9 |
HIP 63803 |
17.29 |
| 2026-09-29 12:00 |
13:05:54.78 |
-00:46:53.8 |
HIP 63803 |
19.33 |
| 2026-09-30 00:00 |
13:06:02.27 |
-00:48:12.6 |
HIP 63803 |
21.42 |
| 2026-09-30 12:00 |
13:06:09.78 |
-00:49:31.3 |
HIP 63803 |
23.54 |
| 2026-10-01 00:00 |
13:06:17.29 |
-00:50:50.0 |
HIP 63855 |
25.25 |
| 2026-10-01 12:00 |
13:06:24.81 |
-00:52:08.6 |
HIP 63855 |
25.59 |
| 2026-10-02 00:00 |
13:06:32.34 |
-00:53:27.1 |
HIP 63855 |
26.14 |
| 2026-10-02 12:00 |
13:06:39.88 |
-00:54:45.6 |
HIP 63855 |
26.87 |
| 2026-10-03 00:00 |
13:06:47.42 |
-00:56:04.0 |
HIP 63855 |
27.77 |
| 2026-10-03 12:00 |
13:06:54.97 |
-00:57:22.3 |
HIP 63855 |
28.83 |
| 2026-10-04 00:00 |
13:07:02.53 |
-00:58:40.5 |
HIP 63855 |
30.03 |
| 2026-10-04 12:00 |
13:07:10.09 |
-00:59:58.6 |
HIP 63855 |
31.35 |
| 2026-10-05 00:00 |
13:07:17.66 |
-01:01:16.6 |
HIP 63855 |
32.79 |
| 2026-10-05 12:00 |
13:07:25.23 |
-01:02:34.5 |
HIP 63855 |
34.31 |
| 2026-10-06 00:00 |
13:07:32.81 |
-01:03:52.4 |
HIP 63855 |
35.93 |
| 2026-10-06 12:00 |
13:07:40.39 |
-01:05:10.1 |
HIP 63855 |
37.61 |
| 2026-10-07 00:00 |
13:07:47.98 |
-01:06:27.8 |
HIP 63855 |
39.36 |
| 2026-10-07 12:00 |
13:07:55.57 |
-01:07:45.3 |
HIP 63855 |
41.16 |
| 2026-10-08 00:00 |
13:08:03.16 |
-01:09:02.8 |
HIP 63855 |
43.01 |
| 2026-10-08 12:00 |
13:08:10.75 |
-01:10:20.1 |
HIP 64247 |
43.75 |
| 2026-10-09 00:00 |
13:08:18.35 |
-01:11:37.3 |
HIP 64247 |
43.56 |
| 2026-10-09 12:00 |
13:08:25.95 |
-01:12:54.4 |
HIP 64247 |
43.49 |
| 2026-10-10 00:00 |
13:08:33.55 |
-01:14:11.4 |
HIP 64247 |
43.54 |
| 2026-10-10 12:00 |
13:08:41.14 |
-01:15:28.3 |
HIP 64247 |
43.70 |
| 2026-10-11 00:00 |
13:08:48.74 |
-01:16:45.1 |
HIP 64351 |
42.46 |