메타데이터
| 항목 |
값 |
| Designation |
C/2024 C4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-01-30T04:46:56.107200Z |
| Orbit solution date (soln_date, UTC) |
2024-08-18T18:42:14Z |
| Obs used |
545 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
9.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-02-14T01:57:11.318400Z |
| Discovery magnitude (MPC) |
17.45 o |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2024-04-20.0000000 |
| e |
0.98249391 |
| q (au) |
1.471267 |
| a (au) |
84.043133 |
| i (deg) |
79.287579 |
| Ω (om, deg) |
220.685068 |
| ω (w, deg) |
321.524084 |
| M (ma, deg) |
0.103363 |
밝기
산란 + 전체 선형
$$
M_a = (13.966 + 4.002\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.966 |
| n |
4.002 |
| gf |
1.000 |
| gb |
-0.751 |
| k |
0.989 |
| 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) |
| 2026-07-29 00:00 |
19:09:08.16 |
+65:59:44.2 |
HIP 94140 |
3.97 |
| 2026-07-29 12:00 |
19:08:44.18 |
+65:58:42.7 |
HIP 94140 |
6.27 |
| 2026-07-30 00:00 |
19:08:20.34 |
+65:57:39.4 |
HIP 94140 |
8.76 |
| 2026-07-30 12:00 |
19:07:56.64 |
+65:56:34.5 |
HIP 94140 |
11.32 |
| 2026-07-31 00:00 |
19:07:33.09 |
+65:55:27.8 |
HIP 94140 |
13.90 |
| 2026-07-31 12:00 |
19:07:09.68 |
+65:54:19.3 |
HIP 94140 |
16.50 |
| 2026-08-01 00:00 |
19:06:46.43 |
+65:53:09.2 |
HIP 94140 |
19.11 |
| 2026-08-01 12:00 |
19:06:23.34 |
+65:51:57.3 |
HIP 94140 |
21.73 |
| 2026-08-02 00:00 |
19:06:00.40 |
+65:50:43.8 |
HIP 93570 |
22.06 |
| 2026-08-02 12:00 |
19:05:37.63 |
+65:49:28.5 |
HIP 93570 |
19.53 |
| 2026-08-03 00:00 |
19:05:15.01 |
+65:48:11.6 |
HIP 93570 |
17.03 |
| 2026-08-03 12:00 |
19:04:52.56 |
+65:46:53.1 |
HIP 93570 |
14.56 |
| 2026-08-04 00:00 |
19:04:30.29 |
+65:45:32.9 |
HIP 93570 |
12.17 |
| 2026-08-04 12:00 |
19:04:08.18 |
+65:44:11.0 |
HIP 93570 |
9.88 |
| 2026-08-05 00:00 |
19:03:46.25 |
+65:42:47.5 |
HIP 93570 |
7.81 |
| 2026-08-05 12:00 |
19:03:24.49 |
+65:41:22.4 |
HIP 93570 |
6.17 |
| 2026-08-06 00:00 |
19:03:02.91 |
+65:39:55.7 |
HIP 93570 |
5.37 |
| 2026-08-06 12:00 |
19:02:41.52 |
+65:38:27.4 |
HIP 93570 |
5.78 |
| 2026-08-07 00:00 |
19:02:20.30 |
+65:36:57.5 |
HIP 93570 |
7.20 |
| 2026-08-07 12:00 |
19:01:59.28 |
+65:35:26.0 |
HIP 93570 |
9.16 |
| 2026-08-08 00:00 |
19:01:38.44 |
+65:33:53.0 |
HIP 93570 |
11.40 |
| 2026-08-08 12:00 |
19:01:17.80 |
+65:32:18.4 |
HIP 93570 |
13.77 |
| 2026-08-09 00:00 |
19:00:57.35 |
+65:30:42.3 |
HIP 93570 |
16.22 |
| 2026-08-09 12:00 |
19:00:37.09 |
+65:29:04.7 |
HIP 93570 |
18.72 |
| 2026-08-10 00:00 |
19:00:17.04 |
+65:27:25.5 |
HIP 93570 |
21.25 |
| 2026-08-10 12:00 |
18:59:57.18 |
+65:25:44.8 |
HIP 93570 |
23.81 |
| 2026-08-11 00:00 |
18:59:37.53 |
+65:24:02.7 |
HIP 92969 |
21.76 |
| 2026-08-11 12:00 |
18:59:18.08 |
+65:22:19.1 |
HIP 92969 |
19.25 |
| 2026-08-12 00:00 |
18:58:58.84 |
+65:20:34.0 |
HIP 92969 |
16.78 |
| 2026-08-12 12:00 |
18:58:39.81 |
+65:18:47.5 |
HIP 92969 |
14.40 |
| 2026-08-13 00:00 |
18:58:21.00 |
+65:16:59.6 |
HIP 92969 |
12.15 |
| 2026-08-13 12:00 |
18:58:02.39 |
+65:15:10.2 |
HIP 92969 |
10.12 |
| 2026-08-14 00:00 |
18:57:44.00 |
+65:13:19.5 |
HIP 92969 |
8.48 |
| 2026-08-14 12:00 |
18:57:25.83 |
+65:11:27.3 |
HIP 92969 |
7.48 |
| 2026-08-15 00:00 |
18:57:07.88 |
+65:09:33.8 |
HIP 92969 |
7.39 |
| 2026-08-15 12:00 |
18:56:50.15 |
+65:07:39.0 |
HIP 92969 |
8.25 |
| 2026-08-16 00:00 |
18:56:32.64 |
+65:05:42.8 |
HIP 92969 |
9.80 |
| 2026-08-16 12:00 |
18:56:15.35 |
+65:03:45.3 |
HIP 92969 |
11.78 |
| 2026-08-17 00:00 |
18:55:58.29 |
+65:01:46.5 |
HIP 92969 |
14.01 |
| 2026-08-17 12:00 |
18:55:41.45 |
+64:59:46.4 |
HIP 93062 |
14.68 |
| 2026-08-18 00:00 |
18:55:24.85 |
+64:57:45.0 |
HIP 93062 |
14.86 |
| 2026-08-18 12:00 |
18:55:08.47 |
+64:55:42.4 |
HIP 93062 |
15.49 |
| 2026-08-19 00:00 |
18:54:52.32 |
+64:53:38.6 |
HIP 92673 |
13.41 |