메타데이터
| 항목 |
값 |
| Designation |
478P/ATLAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-01T18:15:32.791680Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:58:36Z |
| Obs used |
494 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
19.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2017-01-28T11:47:24Z |
| Discovery magnitude (MPC) |
20.80 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2023-08-06.0000000 |
| e |
0.34362489 |
| q (au) |
2.394062 |
| a (au) |
3.647398 |
| i (deg) |
12.523311 |
| Ω (om, deg) |
127.279868 |
| ω (w, deg) |
13.107152 |
| M (ma, deg) |
321.831235 |
밝기
산란 + 전체 선형
$$
M_a = (14.333 + 5.191\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.333 |
| n |
5.191 |
| gf |
0.966 |
| gb |
-0.669 |
| k |
0.801 |
| δ90 |
1.339 |
| 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 |
18:40:12.93 |
-17:07:07.8 |
HIP 91581 |
8.64 |
| 2026-07-29 12:00 |
18:39:56.57 |
-17:08:26.9 |
HIP 91581 |
12.17 |
| 2026-07-30 00:00 |
18:39:40.37 |
-17:09:46.0 |
HIP 91581 |
15.96 |
| 2026-07-30 12:00 |
18:39:24.34 |
-17:11:05.1 |
HIP 91581 |
19.84 |
| 2026-07-31 00:00 |
18:39:08.48 |
-17:12:24.1 |
HIP 91343 |
18.43 |
| 2026-07-31 12:00 |
18:38:52.80 |
-17:13:43.1 |
HIP 91343 |
14.62 |
| 2026-08-01 00:00 |
18:38:37.29 |
-17:15:02.1 |
HIP 91343 |
10.98 |
| 2026-08-01 12:00 |
18:38:21.96 |
-17:16:21.0 |
HIP 91343 |
7.67 |
| 2026-08-02 00:00 |
18:38:06.80 |
-17:17:39.9 |
HIP 91343 |
5.25 |
| 2026-08-02 12:00 |
18:37:51.83 |
-17:18:58.7 |
HIP 91343 |
5.10 |
| 2026-08-03 00:00 |
18:37:37.04 |
-17:20:17.4 |
HIP 91343 |
7.29 |
| 2026-08-03 12:00 |
18:37:22.44 |
-17:21:36.0 |
HIP 91343 |
10.39 |
| 2026-08-04 00:00 |
18:37:08.02 |
-17:22:54.6 |
HIP 91246 |
12.22 |
| 2026-08-04 12:00 |
18:36:53.80 |
-17:24:13.1 |
HIP 91246 |
12.15 |
| 2026-08-05 00:00 |
18:36:39.76 |
-17:25:31.6 |
HIP 91246 |
13.13 |
| 2026-08-05 12:00 |
18:36:25.92 |
-17:26:49.9 |
HIP 91246 |
14.92 |
| 2026-08-06 00:00 |
18:36:12.27 |
-17:28:08.2 |
HIP 91246 |
17.24 |
| 2026-08-06 12:00 |
18:35:58.82 |
-17:29:26.3 |
HIP 91246 |
19.89 |
| 2026-08-07 00:00 |
18:35:45.57 |
-17:30:44.4 |
HIP 91246 |
22.72 |
| 2026-08-07 12:00 |
18:35:32.52 |
-17:32:02.3 |
HIP 91032 |
21.39 |
| 2026-08-08 00:00 |
18:35:19.68 |
-17:33:20.1 |
HIP 91032 |
18.07 |
| 2026-08-08 12:00 |
18:35:07.04 |
-17:34:37.8 |
HIP 91032 |
14.80 |
| 2026-08-09 00:00 |
18:34:54.60 |
-17:35:55.4 |
HIP 91032 |
11.59 |
| 2026-08-09 12:00 |
18:34:42.38 |
-17:37:12.9 |
HIP 91032 |
8.42 |
| 2026-08-10 00:00 |
18:34:30.36 |
-17:38:30.3 |
HIP 91032 |
5.33 |
| 2026-08-10 12:00 |
18:34:18.56 |
-17:39:47.5 |
HIP 91032 |
2.39 |
| 2026-08-11 00:00 |
18:34:06.97 |
-17:41:04.5 |
HIP 91032 |
1.43 |
| 2026-08-11 12:00 |
18:33:55.59 |
-17:42:21.5 |
HIP 91032 |
4.06 |
| 2026-08-12 00:00 |
18:33:44.43 |
-17:43:38.3 |
HIP 91032 |
6.94 |
| 2026-08-12 12:00 |
18:33:33.49 |
-17:44:54.9 |
HIP 91032 |
9.81 |
| 2026-08-13 00:00 |
18:33:22.77 |
-17:46:11.3 |
HIP 91032 |
12.65 |
| 2026-08-13 12:00 |
18:33:12.27 |
-17:47:27.7 |
HIP 91032 |
15.44 |
| 2026-08-14 00:00 |
18:33:01.99 |
-17:48:43.8 |
HIP 91032 |
18.19 |
| 2026-08-14 12:00 |
18:32:51.94 |
-17:49:59.8 |
HIP 91032 |
20.88 |
| 2026-08-15 00:00 |
18:32:42.11 |
-17:51:15.6 |
HIP 90788 |
20.31 |
| 2026-08-15 12:00 |
18:32:32.50 |
-17:52:31.2 |
HIP 90788 |
18.42 |
| 2026-08-16 00:00 |
18:32:23.12 |
-17:53:46.6 |
HIP 90788 |
16.78 |
| 2026-08-16 12:00 |
18:32:13.97 |
-17:55:01.8 |
HIP 90788 |
15.44 |
| 2026-08-17 00:00 |
18:32:05.05 |
-17:56:16.9 |
HIP 90788 |
14.46 |
| 2026-08-17 12:00 |
18:31:56.36 |
-17:57:31.7 |
HIP 90788 |
13.88 |
| 2026-08-18 00:00 |
18:31:47.90 |
-17:58:46.4 |
HIP 90788 |
13.73 |
| 2026-08-18 12:00 |
18:31:39.67 |
-18:00:00.8 |
HIP 90788 |
14.01 |
| 2026-08-19 00:00 |
18:31:31.67 |
-18:01:15.1 |
HIP 90799 |
14.64 |