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) |
| 2026-03-26 00:00 |
16:30:45.39 |
-13:04:48.4 |
HIP 80857 |
2.37 |
| 2026-03-26 12:00 |
16:30:43.16 |
-13:05:44.8 |
HIP 80857 |
1.29 |
| 2026-03-27 00:00 |
16:30:40.72 |
-13:06:41.1 |
HIP 80857 |
0.33 |
| 2026-03-27 12:00 |
16:30:38.06 |
-13:07:37.3 |
HIP 80857 |
1.04 |
| 2026-03-28 00:00 |
16:30:35.18 |
-13:08:33.4 |
HIP 80857 |
2.20 |
| 2026-03-28 12:00 |
16:30:32.09 |
-13:09:29.4 |
HIP 80857 |
3.39 |
| 2026-03-29 00:00 |
16:30:28.78 |
-13:10:25.3 |
HIP 80857 |
4.62 |
| 2026-03-29 12:00 |
16:30:25.25 |
-13:11:21.2 |
HIP 80857 |
5.89 |
| 2026-03-30 00:00 |
16:30:21.50 |
-13:12:16.9 |
HIP 80857 |
7.19 |
| 2026-03-30 12:00 |
16:30:17.54 |
-13:13:12.6 |
HIP 80857 |
8.53 |
| 2026-03-31 00:00 |
16:30:13.36 |
-13:14:08.2 |
HIP 80857 |
9.90 |
| 2026-03-31 12:00 |
16:30:08.97 |
-13:15:03.8 |
HIP 80857 |
11.31 |
| 2026-04-01 00:00 |
16:30:04.37 |
-13:15:59.3 |
HIP 80857 |
12.75 |
| 2026-04-01 12:00 |
16:29:59.55 |
-13:16:54.7 |
HIP 80857 |
14.24 |
| 2026-04-02 00:00 |
16:29:54.51 |
-13:17:50.1 |
HIP 80857 |
15.76 |
| 2026-04-02 12:00 |
16:29:49.27 |
-13:18:45.4 |
HIP 80768 |
16.49 |
| 2026-04-03 00:00 |
16:29:43.81 |
-13:19:40.7 |
HIP 80768 |
15.19 |
| 2026-04-03 12:00 |
16:29:38.14 |
-13:20:35.9 |
HIP 80768 |
13.95 |
| 2026-04-04 00:00 |
16:29:32.26 |
-13:21:31.1 |
HIP 80768 |
12.80 |
| 2026-04-04 12:00 |
16:29:26.17 |
-13:22:26.2 |
HIP 80768 |
11.79 |
| 2026-04-05 00:00 |
16:29:19.86 |
-13:23:21.3 |
HIP 80768 |
10.96 |
| 2026-04-05 12:00 |
16:29:13.35 |
-13:24:16.4 |
HIP 80768 |
10.39 |
| 2026-04-06 00:00 |
16:29:06.63 |
-13:25:11.4 |
HIP 80687 |
9.43 |
| 2026-04-06 12:00 |
16:28:59.70 |
-13:26:06.4 |
HIP 80687 |
7.96 |
| 2026-04-07 00:00 |
16:28:52.56 |
-13:27:01.4 |
HIP 80687 |
6.67 |
| 2026-04-07 12:00 |
16:28:45.22 |
-13:27:56.4 |
HIP 80687 |
5.73 |
| 2026-04-08 00:00 |
16:28:37.67 |
-13:28:51.3 |
HIP 80687 |
5.40 |
| 2026-04-08 12:00 |
16:28:29.92 |
-13:29:46.3 |
HIP 80687 |
5.81 |
| 2026-04-09 00:00 |
16:28:21.96 |
-13:30:41.2 |
HIP 80687 |
6.88 |
| 2026-04-09 12:00 |
16:28:13.80 |
-13:31:36.1 |
HIP 80687 |
8.39 |
| 2026-04-10 00:00 |
16:28:05.44 |
-13:32:31.0 |
HIP 80687 |
10.17 |
| 2026-04-10 12:00 |
16:27:56.87 |
-13:33:25.9 |
HIP 80687 |
12.14 |
| 2026-04-11 00:00 |
16:27:48.11 |
-13:34:20.8 |
HIP 80687 |
14.23 |
| 2026-04-11 12:00 |
16:27:39.15 |
-13:35:15.7 |
HIP 80687 |
16.41 |
| 2026-04-12 00:00 |
16:27:29.98 |
-13:36:10.7 |
HIP 80560 |
17.56 |
| 2026-04-12 12:00 |
16:27:20.63 |
-13:37:05.6 |
HIP 80560 |
15.62 |
| 2026-04-13 00:00 |
16:27:11.07 |
-13:38:00.6 |
HIP 80560 |
13.82 |
| 2026-04-13 12:00 |
16:27:01.32 |
-13:38:55.5 |
HIP 80560 |
12.26 |
| 2026-04-14 00:00 |
16:26:51.38 |
-13:39:50.5 |
HIP 80560 |
11.07 |
| 2026-04-14 12:00 |
16:26:41.25 |
-13:40:45.6 |
HIP 80560 |
10.40 |
| 2026-04-15 00:00 |
16:26:30.92 |
-13:41:40.6 |
HIP 80560 |
10.40 |
| 2026-04-15 12:00 |
16:26:20.41 |
-13:42:35.7 |
HIP 80560 |
11.09 |
| 2026-04-16 00:00 |
16:26:09.71 |
-13:43:30.8 |
HIP 80560 |
12.39 |