메타데이터
| 항목 |
값 |
| Designation |
C/2024 X2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-07T21:16:49.195200Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:24Z |
| Obs used |
505 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
14.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-12-12T07:14:54.009600Z |
| Discovery magnitude (MPC) |
18.84 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-07-07.0000000 |
| e |
0.92731632 |
| q (au) |
3.676302 |
| a (au) |
50.579478 |
| i (deg) |
109.221306 |
| Ω (om, deg) |
122.522615 |
| ω (w, deg) |
315.782732 |
| M (ma, deg) |
359.997571 |
밝기
산란 + 전체 선형
$$
M_a = (5.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.562 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
08:48:44.71 |
+37:42:00.6 |
HIP 43437 |
25.34 |
| 2026-09-20 12:00 |
08:49:00.20 |
+37:45:14.3 |
HIP 43440 |
22.07 |
| 2026-09-21 00:00 |
08:49:15.59 |
+37:48:29.2 |
HIP 43440 |
18.73 |
| 2026-09-21 12:00 |
08:49:30.86 |
+37:51:45.4 |
HIP 43440 |
15.97 |
| 2026-09-22 00:00 |
08:49:46.01 |
+37:55:02.9 |
HIP 43440 |
14.14 |
| 2026-09-22 12:00 |
08:50:01.05 |
+37:58:21.6 |
HIP 43457 |
13.51 |
| 2026-09-23 00:00 |
08:50:15.97 |
+38:01:41.6 |
HIP 43457 |
9.69 |
| 2026-09-23 12:00 |
08:50:30.78 |
+38:05:02.9 |
HIP 43457 |
6.72 |
| 2026-09-24 00:00 |
08:50:45.46 |
+38:08:25.5 |
HIP 43457 |
6.03 |
| 2026-09-24 12:00 |
08:51:00.02 |
+38:11:49.4 |
HIP 43457 |
8.21 |
| 2026-09-25 00:00 |
08:51:14.46 |
+38:15:14.6 |
HIP 43457 |
11.77 |
| 2026-09-25 12:00 |
08:51:28.77 |
+38:18:41.2 |
HIP 43560 |
10.20 |
| 2026-09-26 00:00 |
08:51:42.96 |
+38:22:09.0 |
HIP 43560 |
9.87 |
| 2026-09-26 12:00 |
08:51:57.02 |
+38:25:38.2 |
HIP 43560 |
11.46 |
| 2026-09-27 00:00 |
08:52:10.96 |
+38:29:08.8 |
HIP 43560 |
14.33 |
| 2026-09-27 12:00 |
08:52:24.77 |
+38:32:40.7 |
HIP 43560 |
17.87 |
| 2026-09-28 00:00 |
08:52:38.45 |
+38:36:13.9 |
HIP 43522 |
20.25 |
| 2026-09-28 12:00 |
08:52:51.99 |
+38:39:48.5 |
HIP 43522 |
18.67 |
| 2026-09-29 00:00 |
08:53:05.40 |
+38:43:24.5 |
HIP 43522 |
18.03 |
| 2026-09-29 12:00 |
08:53:18.68 |
+38:47:01.9 |
HIP 43522 |
18.43 |
| 2026-09-30 00:00 |
08:53:31.83 |
+38:50:40.6 |
HIP 43522 |
19.82 |
| 2026-09-30 12:00 |
08:53:44.83 |
+38:54:20.8 |
HIP 43714 |
21.47 |
| 2026-10-01 00:00 |
08:53:57.70 |
+38:58:02.3 |
HIP 43714 |
17.39 |
| 2026-10-01 12:00 |
08:54:10.43 |
+39:01:45.3 |
HIP 43714 |
13.53 |
| 2026-10-02 00:00 |
08:54:23.01 |
+39:05:29.6 |
HIP 43714 |
10.14 |
| 2026-10-02 12:00 |
08:54:35.46 |
+39:09:15.4 |
HIP 43714 |
7.87 |
| 2026-10-03 00:00 |
08:54:47.76 |
+39:13:02.7 |
HIP 43714 |
7.77 |
| 2026-10-03 12:00 |
08:54:59.91 |
+39:16:51.3 |
HIP 43714 |
9.92 |
| 2026-10-04 00:00 |
08:55:11.91 |
+39:20:41.5 |
HIP 43828 |
7.09 |
| 2026-10-04 12:00 |
08:55:23.77 |
+39:24:33.0 |
HIP 43828 |
2.77 |
| 2026-10-05 00:00 |
08:55:35.47 |
+39:28:26.1 |
HIP 43828 |
2.33 |
| 2026-10-05 12:00 |
08:55:47.02 |
+39:32:20.6 |
HIP 43828 |
6.62 |
| 2026-10-06 00:00 |
08:55:58.42 |
+39:36:16.5 |
HIP 43828 |
11.08 |
| 2026-10-06 12:00 |
08:56:09.66 |
+39:40:14.0 |
HIP 43828 |
15.58 |
| 2026-10-07 00:00 |
08:56:20.74 |
+39:44:12.9 |
HIP 43828 |
20.09 |
| 2026-10-07 12:00 |
08:56:31.66 |
+39:48:13.3 |
HIP 43829 |
17.89 |
| 2026-10-08 00:00 |
08:56:42.42 |
+39:52:15.2 |
HIP 43829 |
16.35 |
| 2026-10-08 12:00 |
08:56:53.02 |
+39:56:18.7 |
HIP 43829 |
15.94 |
| 2026-10-09 00:00 |
08:57:03.45 |
+40:00:23.6 |
HIP 43894 |
13.28 |
| 2026-10-09 12:00 |
08:57:13.71 |
+40:04:30.0 |
HIP 43894 |
11.21 |
| 2026-10-10 00:00 |
08:57:23.81 |
+40:08:38.0 |
HIP 44046 |
9.71 |
| 2026-10-10 12:00 |
08:57:33.74 |
+40:12:47.5 |
HIP 44046 |
8.23 |
| 2026-10-11 00:00 |
08:57:43.49 |
+40:16:58.5 |
HIP 44046 |
9.14 |