메타데이터
| 항목 |
값 |
| Designation |
C/2020 M3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-25T14:58:23.448000Z |
| Orbit solution date (soln_date, UTC) |
2022-04-23T03:12:26Z |
| Obs used |
2344 |
| NEO |
Yes |
| M1 |
14.600 |
| K1 |
6.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-06-27T13:57:10.627200Z |
| Discovery magnitude (MPC) |
18.89 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-11-26.0000000 |
| e |
0.95270763 |
| q (au) |
1.268249 |
| a (au) |
26.817195 |
| i (deg) |
23.473528 |
| Ω (om, deg) |
71.250235 |
| ω (w, deg) |
328.446314 |
| M (ma, deg) |
0.222681 |
밝기
산란 + 전체 선형
$$
M_a = (14.015 + 2.681\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.015 |
| n |
2.681 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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 |
| 2012-01-10 |
2020-08-06 |
-14.0320 |
+4.994 |
| 2020-08-06 |
2020-10-25 |
+30.0861 |
-5.641 |
| 2020-10-25 |
2021-06-10 |
+4.2695 |
-2.068 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:09:04.25 |
+13:53:33.8 |
HIP 64328 |
29.87 |
| 2026-07-29 12:00 |
13:09:07.08 |
+13:52:37.6 |
HIP 64328 |
29.23 |
| 2026-07-30 00:00 |
13:09:09.97 |
+13:51:41.3 |
HIP 64328 |
28.61 |
| 2026-07-30 12:00 |
13:09:12.91 |
+13:50:44.9 |
HIP 64328 |
28.02 |
| 2026-07-31 00:00 |
13:09:15.89 |
+13:49:48.3 |
HIP 64328 |
27.45 |
| 2026-07-31 12:00 |
13:09:18.93 |
+13:48:51.6 |
HIP 64328 |
26.91 |
| 2026-08-01 00:00 |
13:09:22.02 |
+13:47:54.7 |
HIP 64328 |
26.40 |
| 2026-08-01 12:00 |
13:09:25.16 |
+13:46:57.7 |
HIP 64328 |
25.93 |
| 2026-08-02 00:00 |
13:09:28.36 |
+13:46:00.6 |
HIP 64328 |
25.50 |
| 2026-08-02 12:00 |
13:09:31.60 |
+13:45:03.4 |
HIP 64328 |
25.11 |
| 2026-08-03 00:00 |
13:09:34.89 |
+13:44:06.0 |
HIP 64328 |
24.76 |
| 2026-08-03 12:00 |
13:09:38.23 |
+13:43:08.5 |
HIP 64328 |
24.46 |
| 2026-08-04 00:00 |
13:09:41.62 |
+13:42:10.9 |
HIP 64328 |
24.22 |
| 2026-08-04 12:00 |
13:09:45.07 |
+13:41:13.2 |
HIP 64328 |
24.02 |
| 2026-08-05 00:00 |
13:09:48.56 |
+13:40:15.4 |
HIP 64328 |
23.89 |
| 2026-08-05 12:00 |
13:09:52.10 |
+13:39:17.4 |
HIP 64328 |
23.82 |
| 2026-08-06 00:00 |
13:09:55.69 |
+13:38:19.4 |
HIP 64304 |
23.53 |
| 2026-08-06 12:00 |
13:09:59.32 |
+13:37:21.2 |
HIP 64304 |
22.24 |
| 2026-08-07 00:00 |
13:10:03.01 |
+13:36:23.0 |
HIP 64304 |
20.95 |
| 2026-08-07 12:00 |
13:10:06.75 |
+13:35:24.7 |
HIP 64304 |
19.65 |
| 2026-08-08 00:00 |
13:10:10.53 |
+13:34:26.2 |
HIP 64304 |
18.35 |
| 2026-08-08 12:00 |
13:10:14.36 |
+13:33:27.7 |
HIP 64304 |
17.05 |
| 2026-08-09 00:00 |
13:10:18.24 |
+13:32:29.1 |
HIP 64304 |
15.75 |
| 2026-08-09 12:00 |
13:10:22.16 |
+13:31:30.4 |
HIP 64304 |
14.45 |
| 2026-08-10 00:00 |
13:10:26.13 |
+13:30:31.7 |
HIP 64304 |
13.17 |
| 2026-08-10 12:00 |
13:10:30.15 |
+13:29:32.8 |
HIP 64304 |
11.89 |
| 2026-08-11 00:00 |
13:10:34.22 |
+13:28:33.9 |
HIP 64304 |
10.64 |
| 2026-08-11 12:00 |
13:10:38.33 |
+13:27:34.9 |
HIP 64304 |
9.43 |
| 2026-08-12 00:00 |
13:10:42.49 |
+13:26:35.9 |
HIP 64304 |
8.27 |
| 2026-08-12 12:00 |
13:10:46.69 |
+13:25:36.8 |
HIP 64304 |
7.21 |
| 2026-08-13 00:00 |
13:10:50.94 |
+13:24:37.6 |
HIP 64304 |
6.29 |
| 2026-08-13 12:00 |
13:10:55.23 |
+13:23:38.4 |
HIP 64304 |
5.58 |
| 2026-08-14 00:00 |
13:10:59.57 |
+13:22:39.1 |
HIP 64304 |
5.20 |
| 2026-08-14 12:00 |
13:11:03.95 |
+13:21:39.8 |
HIP 64304 |
5.21 |
| 2026-08-15 00:00 |
13:11:08.38 |
+13:20:40.5 |
HIP 64304 |
5.62 |
| 2026-08-15 12:00 |
13:11:12.85 |
+13:19:41.1 |
HIP 64304 |
6.36 |
| 2026-08-16 00:00 |
13:11:17.36 |
+13:18:41.6 |
HIP 64304 |
7.33 |
| 2026-08-16 12:00 |
13:11:21.92 |
+13:17:42.2 |
HIP 64304 |
8.46 |
| 2026-08-17 00:00 |
13:11:26.52 |
+13:16:42.7 |
HIP 64304 |
9.70 |
| 2026-08-17 12:00 |
13:11:31.16 |
+13:15:43.2 |
HIP 64304 |
11.01 |
| 2026-08-18 00:00 |
13:11:35.84 |
+13:14:43.6 |
HIP 64304 |
12.38 |
| 2026-08-18 12:00 |
13:11:40.57 |
+13:13:44.1 |
HIP 64304 |
13.79 |
| 2026-08-19 00:00 |
13:11:45.33 |
+13:12:44.5 |
HIP 64304 |
15.23 |