메타데이터
| 항목 |
값 |
| Designation |
C/2021 Q3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-01-26T01:52:57.941760Z |
| Orbit solution date (soln_date, UTC) |
2023-03-20T19:42:36Z |
| Obs used |
180 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-08-26T07:07:01.228800Z |
| Discovery magnitude (MPC) |
19.02 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-01-10.0000000 |
| e |
0.93033551 |
| q (au) |
5.204636 |
| a (au) |
74.710023 |
| i (deg) |
77.777282 |
| Ω (om, deg) |
307.900611 |
| ω (w, deg) |
114.090847 |
| M (ma, deg) |
359.975460 |
밝기
산란 + 전체 선형
$$
M_a = (3.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.505 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:49:00.91 |
-15:19:53.8 |
HIP 43299 |
14.41 |
| 2026-09-20 12:00 |
08:49:06.84 |
-15:21:47.9 |
HIP 43299 |
12.25 |
| 2026-09-21 00:00 |
08:49:12.71 |
-15:23:42.2 |
HIP 43299 |
10.20 |
| 2026-09-21 12:00 |
08:49:18.53 |
-15:25:36.9 |
HIP 43299 |
8.30 |
| 2026-09-22 00:00 |
08:49:24.30 |
-15:27:31.7 |
HIP 43299 |
6.71 |
| 2026-09-22 12:00 |
08:49:30.00 |
-15:29:26.8 |
HIP 43299 |
5.67 |
| 2026-09-23 00:00 |
08:49:35.66 |
-15:31:22.2 |
HIP 43299 |
5.50 |
| 2026-09-23 12:00 |
08:49:41.25 |
-15:33:17.8 |
HIP 43299 |
6.27 |
| 2026-09-24 00:00 |
08:49:46.79 |
-15:35:13.7 |
HIP 43299 |
7.69 |
| 2026-09-24 12:00 |
08:49:52.27 |
-15:37:09.8 |
HIP 43299 |
9.48 |
| 2026-09-25 00:00 |
08:49:57.70 |
-15:39:06.1 |
HIP 43299 |
11.46 |
| 2026-09-25 12:00 |
08:50:03.06 |
-15:41:02.7 |
HIP 43299 |
13.54 |
| 2026-09-26 00:00 |
08:50:08.37 |
-15:42:59.5 |
HIP 43299 |
15.69 |
| 2026-09-26 12:00 |
08:50:13.62 |
-15:44:56.5 |
HIP 43299 |
17.87 |
| 2026-09-27 00:00 |
08:50:18.81 |
-15:46:53.8 |
HIP 43436 |
17.62 |
| 2026-09-27 12:00 |
08:50:23.94 |
-15:48:51.3 |
HIP 43436 |
15.34 |
| 2026-09-28 00:00 |
08:50:29.01 |
-15:50:48.9 |
HIP 43436 |
13.06 |
| 2026-09-28 12:00 |
08:50:34.02 |
-15:52:46.8 |
HIP 43436 |
10.81 |
| 2026-09-29 00:00 |
08:50:38.96 |
-15:54:44.9 |
HIP 43436 |
8.58 |
| 2026-09-29 12:00 |
08:50:43.85 |
-15:56:43.2 |
HIP 43436 |
6.41 |
| 2026-09-30 00:00 |
08:50:48.68 |
-15:58:41.7 |
HIP 43436 |
4.35 |
| 2026-09-30 12:00 |
08:50:53.44 |
-16:00:40.4 |
HIP 43436 |
2.69 |
| 2026-10-01 00:00 |
08:50:58.14 |
-16:02:39.3 |
HIP 43436 |
2.43 |
| 2026-10-01 12:00 |
08:51:02.78 |
-16:04:38.4 |
HIP 43436 |
3.86 |
| 2026-10-02 00:00 |
08:51:07.35 |
-16:06:37.6 |
HIP 43436 |
5.84 |
| 2026-10-02 12:00 |
08:51:11.86 |
-16:08:37.1 |
HIP 43436 |
7.97 |
| 2026-10-03 00:00 |
08:51:16.30 |
-16:10:36.7 |
HIP 43436 |
10.15 |
| 2026-10-03 12:00 |
08:51:20.68 |
-16:12:36.5 |
HIP 43436 |
12.35 |
| 2026-10-04 00:00 |
08:51:25.00 |
-16:14:36.4 |
HIP 43436 |
14.56 |
| 2026-10-04 12:00 |
08:51:29.25 |
-16:16:36.5 |
HIP 43436 |
16.78 |
| 2026-10-05 00:00 |
08:51:33.43 |
-16:18:36.7 |
HIP 43436 |
18.99 |
| 2026-10-05 12:00 |
08:51:37.55 |
-16:20:37.1 |
HIP 43436 |
21.20 |
| 2026-10-06 00:00 |
08:51:41.60 |
-16:22:37.7 |
HIP 43436 |
23.42 |
| 2026-10-06 12:00 |
08:51:45.58 |
-16:24:38.4 |
HIP 43436 |
25.62 |
| 2026-10-07 00:00 |
08:51:49.49 |
-16:26:39.2 |
HIP 43436 |
27.83 |
| 2026-10-07 12:00 |
08:51:53.34 |
-16:28:40.2 |
HIP 43436 |
30.03 |
| 2026-10-08 00:00 |
08:51:57.12 |
-16:30:41.2 |
HIP 43623 |
31.09 |
| 2026-10-08 12:00 |
08:52:00.82 |
-16:32:42.4 |
HIP 43623 |
28.91 |
| 2026-10-09 00:00 |
08:52:04.46 |
-16:34:43.8 |
HIP 43623 |
26.73 |
| 2026-10-09 12:00 |
08:52:08.03 |
-16:36:45.2 |
HIP 43623 |
24.57 |
| 2026-10-10 00:00 |
08:52:11.52 |
-16:38:46.7 |
HIP 43623 |
22.43 |
| 2026-10-10 12:00 |
08:52:14.95 |
-16:40:48.3 |
HIP 43623 |
20.31 |
| 2026-10-11 00:00 |
08:52:18.30 |
-16:42:50.0 |
HIP 43623 |
18.20 |