메타데이터
| 항목 |
값 |
| Designation |
C/2025 A4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-01-13T02:45:57.608640Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:11Z |
| Obs used |
100 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-01-03T15:06:00.892800Z |
| Discovery magnitude (MPC) |
21.05 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2025-03-05.0000000 |
| e |
0.65381554 |
| q (au) |
3.824179 |
| a (au) |
11.046652 |
| i (deg) |
32.025692 |
| Ω (om, deg) |
69.912504 |
| ω (w, deg) |
102.791064 |
| M (ma, deg) |
1.365984 |
밝기
산란 + 전체 선형
$$
M_a = (14.631 + 3.439\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.631 |
| n |
3.439 |
| gf |
1.000 |
| gb |
-0.628 |
| k |
0.800 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
16:13:25.49 |
-14:33:18.2 |
HIP 79405 |
22.46 |
| 2026-05-12 12:00 |
16:13:07.91 |
-14:34:19.0 |
HIP 79405 |
18.84 |
| 2026-05-13 00:00 |
16:12:50.28 |
-14:35:19.9 |
HIP 79405 |
15.59 |
| 2026-05-13 12:00 |
16:12:32.58 |
-14:36:21.0 |
HIP 79405 |
13.02 |
| 2026-05-14 00:00 |
16:12:14.83 |
-14:37:22.2 |
HIP 79405 |
11.60 |
| 2026-05-14 12:00 |
16:11:57.03 |
-14:38:23.6 |
HIP 79405 |
11.78 |
| 2026-05-15 00:00 |
16:11:39.17 |
-14:39:25.2 |
HIP 79405 |
13.50 |
| 2026-05-15 12:00 |
16:11:21.27 |
-14:40:27.0 |
HIP 79405 |
16.29 |
| 2026-05-16 00:00 |
16:11:03.33 |
-14:41:28.9 |
HIP 79296 |
18.48 |
| 2026-05-16 12:00 |
16:10:45.35 |
-14:42:31.1 |
HIP 79296 |
19.75 |
| 2026-05-17 00:00 |
16:10:27.34 |
-14:43:33.4 |
HIP 79296 |
21.88 |
| 2026-05-17 12:00 |
16:10:09.29 |
-14:44:35.9 |
HIP 79296 |
24.65 |
| 2026-05-18 00:00 |
16:09:51.21 |
-14:45:38.5 |
HIP 79296 |
27.89 |
| 2026-05-18 12:00 |
16:09:33.10 |
-14:46:41.4 |
HIP 79296 |
31.44 |
| 2026-05-19 00:00 |
16:09:14.97 |
-14:47:44.5 |
HIP 79296 |
35.21 |
| 2026-05-19 12:00 |
16:08:56.82 |
-14:48:47.7 |
HIP 78969 |
35.21 |
| 2026-05-20 00:00 |
16:08:38.66 |
-14:49:51.1 |
HIP 78969 |
33.13 |
| 2026-05-20 12:00 |
16:08:20.48 |
-14:50:54.8 |
HIP 78969 |
31.56 |
| 2026-05-21 00:00 |
16:08:02.29 |
-14:51:58.6 |
HIP 78969 |
30.60 |
| 2026-05-21 12:00 |
16:07:44.09 |
-14:53:02.7 |
HIP 78969 |
30.29 |
| 2026-05-22 00:00 |
16:07:25.89 |
-14:54:06.9 |
HIP 78969 |
30.65 |
| 2026-05-22 12:00 |
16:07:07.69 |
-14:55:11.3 |
HIP 78969 |
31.68 |
| 2026-05-23 00:00 |
16:06:49.49 |
-14:56:16.0 |
HIP 78753 |
30.79 |
| 2026-05-23 12:00 |
16:06:31.29 |
-14:57:20.9 |
HIP 78753 |
26.49 |
| 2026-05-24 00:00 |
16:06:13.11 |
-14:58:25.9 |
HIP 78753 |
22.29 |
| 2026-05-24 12:00 |
16:05:54.93 |
-14:59:31.2 |
HIP 78753 |
18.24 |
| 2026-05-25 00:00 |
16:05:36.77 |
-15:00:36.7 |
HIP 78753 |
14.48 |
| 2026-05-25 12:00 |
16:05:18.62 |
-15:01:42.4 |
HIP 78753 |
11.30 |
| 2026-05-26 00:00 |
16:05:00.50 |
-15:02:48.3 |
HIP 78753 |
9.31 |
| 2026-05-26 12:00 |
16:04:42.40 |
-15:03:54.4 |
HIP 78753 |
9.30 |
| 2026-05-27 00:00 |
16:04:24.32 |
-15:05:00.7 |
HIP 78687 |
8.73 |
| 2026-05-27 12:00 |
16:04:06.27 |
-15:06:07.3 |
HIP 78687 |
4.23 |
| 2026-05-28 00:00 |
16:03:48.26 |
-15:07:14.0 |
HIP 78687 |
0.31 |
| 2026-05-28 12:00 |
16:03:30.27 |
-15:08:21.0 |
HIP 78687 |
4.74 |
| 2026-05-29 00:00 |
16:03:12.33 |
-15:09:28.2 |
HIP 78687 |
9.21 |
| 2026-05-29 12:00 |
16:02:54.42 |
-15:10:35.7 |
HIP 78687 |
13.68 |
| 2026-05-30 00:00 |
16:02:36.56 |
-15:11:43.3 |
HIP 78503 |
14.66 |
| 2026-05-30 12:00 |
16:02:18.74 |
-15:12:51.2 |
HIP 78503 |
10.28 |
| 2026-05-31 00:00 |
16:02:00.97 |
-15:13:59.3 |
HIP 78503 |
6.02 |
| 2026-05-31 12:00 |
16:01:43.25 |
-15:15:07.6 |
HIP 78503 |
2.49 |
| 2026-06-01 00:00 |
16:01:25.59 |
-15:16:16.2 |
HIP 78503 |
3.90 |
| 2026-06-01 12:00 |
16:01:07.98 |
-15:17:25.0 |
HIP 78503 |
7.94 |
| 2026-06-02 00:00 |
16:00:50.42 |
-15:18:34.0 |
HIP 78430 |
6.44 |