메타데이터
| 항목 |
값 |
| Designation |
P/2025 D4 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-02-14T06:47:27.813120Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:49Z |
| Obs used |
313 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
20.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-24T07:24:27.360000Z |
| Discovery magnitude (MPC) |
18.97 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-04-07.0000000 |
| e |
0.63433709 |
| q (au) |
3.254936 |
| a (au) |
8.901466 |
| i (deg) |
15.940781 |
| Ω (om, deg) |
233.119870 |
| ω (w, deg) |
332.889196 |
| M (ma, deg) |
1.919311 |
밝기
산란 + 전체 선형
$$
M_a = (10.708 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.708 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.645 |
| k |
0.800 |
| δ90 |
9.994 |
| 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) |
| 2026-05-12 00:00 |
19:25:18.20 |
-08:17:51.7 |
HIP 95588 |
20.27 |
| 2026-05-12 12:00 |
19:25:15.89 |
-08:15:57.5 |
HIP 95588 |
20.12 |
| 2026-05-13 00:00 |
19:25:13.37 |
-08:14:03.9 |
HIP 95588 |
20.23 |
| 2026-05-13 12:00 |
19:25:10.63 |
-08:12:11.1 |
HIP 95588 |
20.58 |
| 2026-05-14 00:00 |
19:25:07.67 |
-08:10:18.9 |
HIP 95588 |
21.17 |
| 2026-05-14 12:00 |
19:25:04.50 |
-08:08:27.4 |
HIP 95588 |
21.98 |
| 2026-05-15 00:00 |
19:25:01.13 |
-08:06:36.6 |
HIP 95588 |
22.99 |
| 2026-05-15 12:00 |
19:24:57.53 |
-08:04:46.5 |
HIP 95588 |
24.18 |
| 2026-05-16 00:00 |
19:24:53.73 |
-08:02:57.2 |
HIP 95588 |
25.52 |
| 2026-05-16 12:00 |
19:24:49.72 |
-08:01:08.5 |
HIP 95588 |
27.00 |
| 2026-05-17 00:00 |
19:24:45.50 |
-07:59:20.6 |
HIP 95588 |
28.59 |
| 2026-05-17 12:00 |
19:24:41.07 |
-07:57:33.5 |
HIP 95588 |
30.29 |
| 2026-05-18 00:00 |
19:24:36.44 |
-07:55:47.1 |
HIP 95588 |
32.08 |
| 2026-05-18 12:00 |
19:24:31.59 |
-07:54:01.4 |
HIP 95597 |
33.37 |
| 2026-05-19 00:00 |
19:24:26.55 |
-07:52:16.6 |
HIP 95597 |
34.03 |
| 2026-05-19 12:00 |
19:24:21.30 |
-07:50:32.5 |
HIP 95281 |
32.64 |
| 2026-05-20 00:00 |
19:24:15.84 |
-07:48:49.2 |
HIP 95281 |
30.45 |
| 2026-05-20 12:00 |
19:24:10.19 |
-07:47:06.7 |
HIP 95281 |
28.25 |
| 2026-05-21 00:00 |
19:24:04.33 |
-07:45:25.0 |
HIP 95281 |
26.03 |
| 2026-05-21 12:00 |
19:23:58.27 |
-07:43:44.1 |
HIP 95281 |
23.79 |
| 2026-05-22 00:00 |
19:23:52.02 |
-07:42:04.0 |
HIP 95281 |
21.55 |
| 2026-05-22 12:00 |
19:23:45.57 |
-07:40:24.7 |
HIP 95281 |
19.29 |
| 2026-05-23 00:00 |
19:23:38.93 |
-07:38:46.3 |
HIP 95281 |
17.04 |
| 2026-05-23 12:00 |
19:23:32.09 |
-07:37:08.6 |
HIP 95281 |
14.79 |
| 2026-05-24 00:00 |
19:23:25.05 |
-07:35:31.9 |
HIP 95281 |
12.58 |
| 2026-05-24 12:00 |
19:23:17.83 |
-07:33:56.0 |
HIP 95281 |
10.44 |
| 2026-05-25 00:00 |
19:23:10.42 |
-07:32:20.9 |
HIP 95281 |
8.45 |
| 2026-05-25 12:00 |
19:23:02.81 |
-07:30:46.7 |
HIP 95281 |
6.76 |
| 2026-05-26 00:00 |
19:22:55.02 |
-07:29:13.4 |
HIP 95281 |
5.69 |
| 2026-05-26 12:00 |
19:22:47.05 |
-07:27:40.9 |
HIP 95281 |
5.65 |
| 2026-05-27 00:00 |
19:22:38.89 |
-07:26:09.3 |
HIP 95281 |
6.68 |
| 2026-05-27 12:00 |
19:22:30.55 |
-07:24:38.6 |
HIP 95281 |
8.42 |
| 2026-05-28 00:00 |
19:22:22.02 |
-07:23:08.8 |
HIP 95228 |
10.16 |
| 2026-05-28 12:00 |
19:22:13.32 |
-07:21:39.9 |
HIP 95228 |
9.37 |
| 2026-05-29 00:00 |
19:22:04.43 |
-07:20:11.9 |
HIP 95228 |
9.32 |
| 2026-05-29 12:00 |
19:21:55.37 |
-07:18:44.8 |
HIP 95228 |
10.04 |
| 2026-05-30 00:00 |
19:21:46.13 |
-07:17:18.7 |
HIP 95228 |
11.41 |
| 2026-05-30 12:00 |
19:21:36.72 |
-07:15:53.4 |
HIP 95228 |
13.24 |
| 2026-05-31 00:00 |
19:21:27.14 |
-07:14:29.1 |
HIP 95228 |
15.39 |
| 2026-05-31 12:00 |
19:21:17.38 |
-07:13:05.7 |
HIP 95228 |
17.75 |
| 2026-06-01 00:00 |
19:21:07.46 |
-07:11:43.3 |
HIP 95228 |
20.26 |
| 2026-06-01 12:00 |
19:20:57.37 |
-07:10:21.8 |
HIP 95228 |
22.88 |
| 2026-06-02 00:00 |
19:20:47.11 |
-07:09:01.3 |
HIP 94955 |
22.69 |