메타데이터
| 항목 |
값 |
| Designation |
C/2020 X2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-11-15T21:24:26.968320Z |
| Orbit solution date (soln_date, UTC) |
2024-01-04T23:42:39Z |
| Obs used |
253 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
16.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-10T12:05:53.462400Z |
| Discovery magnitude (MPC) |
18.27 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-12-19.0000000 |
| e |
0.76624465 |
| q (au) |
3.828504 |
| a (au) |
16.378251 |
| i (deg) |
18.191452 |
| Ω (om, deg) |
105.458856 |
| ω (w, deg) |
347.357421 |
| M (ma, deg) |
0.492307 |
밝기
산란 + 전체 선형
$$
M_a = (7.671 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.671 |
| n |
6.000 |
| gf |
0.993 |
| gb |
-0.845 |
| k |
0.998 |
| δ90 |
1.012 |
| 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) |
| 2026-06-01 00:00 |
14:44:53.06 |
+02:43:17.8 |
HIP 71948 |
29.43 |
| 2026-06-01 12:00 |
14:44:46.48 |
+02:43:20.0 |
HIP 71948 |
27.80 |
| 2026-06-02 00:00 |
14:44:39.95 |
+02:43:21.7 |
HIP 71948 |
26.18 |
| 2026-06-02 12:00 |
14:44:33.46 |
+02:43:22.9 |
HIP 71948 |
24.57 |
| 2026-06-03 00:00 |
14:44:27.02 |
+02:43:23.5 |
HIP 71948 |
22.97 |
| 2026-06-03 12:00 |
14:44:20.62 |
+02:43:23.7 |
HIP 71948 |
21.38 |
| 2026-06-04 00:00 |
14:44:14.27 |
+02:43:23.3 |
HIP 71948 |
19.81 |
| 2026-06-04 12:00 |
14:44:07.97 |
+02:43:22.3 |
HIP 71948 |
18.25 |
| 2026-06-05 00:00 |
14:44:01.71 |
+02:43:20.9 |
HIP 71948 |
16.70 |
| 2026-06-05 12:00 |
14:43:55.50 |
+02:43:18.9 |
HIP 71948 |
15.16 |
| 2026-06-06 00:00 |
14:43:49.34 |
+02:43:16.4 |
HIP 71948 |
13.64 |
| 2026-06-06 12:00 |
14:43:43.23 |
+02:43:13.3 |
HIP 71948 |
12.13 |
| 2026-06-07 00:00 |
14:43:37.16 |
+02:43:09.7 |
HIP 71948 |
10.64 |
| 2026-06-07 12:00 |
14:43:31.15 |
+02:43:05.6 |
HIP 71948 |
9.16 |
| 2026-06-08 00:00 |
14:43:25.19 |
+02:43:01.0 |
HIP 71948 |
7.71 |
| 2026-06-08 12:00 |
14:43:19.27 |
+02:42:55.8 |
HIP 71948 |
6.28 |
| 2026-06-09 00:00 |
14:43:13.41 |
+02:42:50.1 |
HIP 71948 |
4.88 |
| 2026-06-09 12:00 |
14:43:07.61 |
+02:42:43.9 |
HIP 71948 |
3.56 |
| 2026-06-10 00:00 |
14:43:01.85 |
+02:42:37.2 |
HIP 71948 |
2.39 |
| 2026-06-10 12:00 |
14:42:56.15 |
+02:42:29.9 |
HIP 71948 |
1.69 |
| 2026-06-11 00:00 |
14:42:50.50 |
+02:42:22.1 |
HIP 71948 |
2.02 |
| 2026-06-11 12:00 |
14:42:44.91 |
+02:42:13.7 |
HIP 71948 |
3.03 |
| 2026-06-12 00:00 |
14:42:39.37 |
+02:42:04.9 |
HIP 71948 |
4.25 |
| 2026-06-12 12:00 |
14:42:33.89 |
+02:41:55.5 |
HIP 71948 |
5.54 |
| 2026-06-13 00:00 |
14:42:28.46 |
+02:41:45.6 |
HIP 71948 |
6.85 |
| 2026-06-13 12:00 |
14:42:23.09 |
+02:41:35.1 |
HIP 71948 |
8.16 |
| 2026-06-14 00:00 |
14:42:17.78 |
+02:41:24.2 |
HIP 71948 |
9.47 |
| 2026-06-14 12:00 |
14:42:12.52 |
+02:41:12.7 |
HIP 71948 |
10.77 |
| 2026-06-15 00:00 |
14:42:07.33 |
+02:41:00.7 |
HIP 71948 |
12.06 |
| 2026-06-15 12:00 |
14:42:02.19 |
+02:40:48.1 |
HIP 71948 |
13.34 |
| 2026-06-16 00:00 |
14:41:57.11 |
+02:40:35.1 |
HIP 71948 |
14.61 |
| 2026-06-16 12:00 |
14:41:52.09 |
+02:40:21.5 |
HIP 71948 |
15.87 |
| 2026-06-17 00:00 |
14:41:47.13 |
+02:40:07.4 |
HIP 71948 |
17.12 |
| 2026-06-17 12:00 |
14:41:42.24 |
+02:39:52.8 |
HIP 71948 |
18.35 |
| 2026-06-18 00:00 |
14:41:37.40 |
+02:39:37.7 |
HIP 71948 |
19.57 |
| 2026-06-18 12:00 |
14:41:32.62 |
+02:39:22.0 |
HIP 71948 |
20.78 |
| 2026-06-19 00:00 |
14:41:27.91 |
+02:39:05.9 |
HIP 71706 |
21.90 |
| 2026-06-19 12:00 |
14:41:23.26 |
+02:38:49.2 |
HIP 71706 |
20.88 |
| 2026-06-20 00:00 |
14:41:18.67 |
+02:38:32.1 |
HIP 71706 |
19.90 |
| 2026-06-20 12:00 |
14:41:14.15 |
+02:38:14.4 |
HIP 71706 |
18.96 |
| 2026-06-21 00:00 |
14:41:09.69 |
+02:37:56.2 |
HIP 71706 |
18.07 |
| 2026-06-21 12:00 |
14:41:05.29 |
+02:37:37.5 |
HIP 71706 |
17.23 |
| 2026-06-22 00:00 |
14:41:00.95 |
+02:37:18.4 |
HIP 71706 |
16.44 |