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
$$
M_a = (10.704 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.704 |
| n |
6.000 |
| gf |
0.950 |
| gb |
-0.645 |
| k |
0.800 |
| δ90 |
9.464 |
| 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 |
18:46:45.07 |
-08:03:35.7 |
HIP 92126 |
4.15 |
| 2026-09-20 12:00 |
18:46:51.20 |
-08:04:30.0 |
HIP 92126 |
4.49 |
| 2026-09-21 00:00 |
18:46:57.51 |
-08:05:23.9 |
HIP 92126 |
5.46 |
| 2026-09-21 12:00 |
18:47:04.00 |
-08:06:17.6 |
HIP 92126 |
6.82 |
| 2026-09-22 00:00 |
18:47:10.66 |
-08:07:11.1 |
HIP 92126 |
8.41 |
| 2026-09-22 12:00 |
18:47:17.50 |
-08:08:04.2 |
HIP 92126 |
10.14 |
| 2026-09-23 00:00 |
18:47:24.51 |
-08:08:57.0 |
HIP 92126 |
11.97 |
| 2026-09-23 12:00 |
18:47:31.69 |
-08:09:49.5 |
HIP 92126 |
13.87 |
| 2026-09-24 00:00 |
18:47:39.05 |
-08:10:41.7 |
HIP 92126 |
15.83 |
| 2026-09-24 12:00 |
18:47:46.58 |
-08:11:33.6 |
HIP 92126 |
17.84 |
| 2026-09-25 00:00 |
18:47:54.28 |
-08:12:25.2 |
HIP 92126 |
19.90 |
| 2026-09-25 12:00 |
18:48:02.14 |
-08:13:16.5 |
HIP 92351 |
19.98 |
| 2026-09-26 00:00 |
18:48:10.18 |
-08:14:07.4 |
HIP 92351 |
17.83 |
| 2026-09-26 12:00 |
18:48:18.39 |
-08:14:58.0 |
HIP 92351 |
15.66 |
| 2026-09-27 00:00 |
18:48:26.77 |
-08:15:48.2 |
HIP 92351 |
13.45 |
| 2026-09-27 12:00 |
18:48:35.31 |
-08:16:38.1 |
HIP 92351 |
11.21 |
| 2026-09-28 00:00 |
18:48:44.02 |
-08:17:27.7 |
HIP 92351 |
8.95 |
| 2026-09-28 12:00 |
18:48:52.89 |
-08:18:16.8 |
HIP 92351 |
6.67 |
| 2026-09-29 00:00 |
18:49:01.93 |
-08:19:05.7 |
HIP 92351 |
4.43 |
| 2026-09-29 12:00 |
18:49:11.13 |
-08:19:54.1 |
HIP 92351 |
2.43 |
| 2026-09-30 00:00 |
18:49:20.49 |
-08:20:42.2 |
HIP 92351 |
1.96 |
| 2026-09-30 12:00 |
18:49:30.02 |
-08:21:29.9 |
HIP 92351 |
3.73 |
| 2026-10-01 00:00 |
18:49:39.71 |
-08:22:17.3 |
HIP 92351 |
6.06 |
| 2026-10-01 12:00 |
18:49:49.57 |
-08:23:04.2 |
HIP 92423 |
3.96 |
| 2026-10-02 00:00 |
18:49:59.58 |
-08:23:50.7 |
HIP 92423 |
1.64 |
| 2026-10-02 12:00 |
18:50:09.75 |
-08:24:36.9 |
HIP 92423 |
1.80 |
| 2026-10-03 00:00 |
18:50:20.08 |
-08:25:22.6 |
HIP 92423 |
4.23 |
| 2026-10-03 12:00 |
18:50:30.57 |
-08:26:08.0 |
HIP 92423 |
6.87 |
| 2026-10-04 00:00 |
18:50:41.22 |
-08:26:52.9 |
HIP 92423 |
9.58 |
| 2026-10-04 12:00 |
18:50:52.02 |
-08:27:37.4 |
HIP 92423 |
12.33 |
| 2026-10-05 00:00 |
18:51:02.99 |
-08:28:21.5 |
HIP 92595 |
14.72 |
| 2026-10-05 12:00 |
18:51:14.10 |
-08:29:05.1 |
HIP 92595 |
12.04 |
| 2026-10-06 00:00 |
18:51:25.38 |
-08:29:48.4 |
HIP 92595 |
9.42 |
| 2026-10-06 12:00 |
18:51:36.80 |
-08:30:31.1 |
HIP 92595 |
6.97 |
| 2026-10-07 00:00 |
18:51:48.38 |
-08:31:13.5 |
HIP 92595 |
5.00 |
| 2026-10-07 12:00 |
18:52:00.12 |
-08:31:55.3 |
HIP 92595 |
4.33 |
| 2026-10-08 00:00 |
18:52:12.00 |
-08:32:36.7 |
HIP 92595 |
5.51 |
| 2026-10-08 12:00 |
18:52:24.04 |
-08:33:17.7 |
HIP 92595 |
7.78 |
| 2026-10-09 00:00 |
18:52:36.23 |
-08:33:58.2 |
HIP 92595 |
10.48 |
| 2026-10-09 12:00 |
18:52:48.56 |
-08:34:38.2 |
HIP 92595 |
13.38 |
| 2026-10-10 00:00 |
18:53:01.05 |
-08:35:17.7 |
HIP 92595 |
16.39 |
| 2026-10-10 12:00 |
18:53:13.68 |
-08:35:56.8 |
HIP 92595 |
19.48 |
| 2026-10-11 00:00 |
18:53:26.46 |
-08:36:35.4 |
HIP 92595 |
22.62 |