메타데이터
| 항목 |
값 |
| Designation |
258P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-06-18T01:33:18.210240Z |
| Orbit solution date (soln_date, UTC) |
2021-10-18T22:42:54Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-06-01.0000000 |
| e |
0.21036720 |
| q (au) |
3.478121 |
| a (au) |
4.404733 |
| i (deg) |
6.745233 |
| Ω (om, deg) |
126.294862 |
| ω (w, deg) |
26.014329 |
| M (ma, deg) |
202.413786 |
밝기
산란 + 전체 선형
$$
M_a = (15.051 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.051 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.606 |
| k |
1.000 |
| 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 |
00:58:23.43 |
+00:41:50.9 |
HIP 4623 |
15.71 |
| 2026-05-12 12:00 |
00:58:46.50 |
+00:43:52.5 |
HIP 4623 |
9.59 |
| 2026-05-13 00:00 |
00:59:09.53 |
+00:45:53.6 |
HIP 4623 |
3.49 |
| 2026-05-13 12:00 |
00:59:32.51 |
+00:47:54.0 |
HIP 4624 |
2.57 |
| 2026-05-14 00:00 |
00:59:55.43 |
+00:49:54.0 |
HIP 4624 |
8.62 |
| 2026-05-14 12:00 |
01:00:18.31 |
+00:51:53.3 |
HIP 4624 |
14.68 |
| 2026-05-15 00:00 |
01:00:41.13 |
+00:53:52.1 |
HIP 4624 |
20.71 |
| 2026-05-15 12:00 |
01:01:03.90 |
+00:55:50.3 |
HIP 4624 |
26.74 |
| 2026-05-16 00:00 |
01:01:26.62 |
+00:57:47.9 |
HIP 4642 |
32.62 |
| 2026-05-16 12:00 |
01:01:49.28 |
+00:59:44.9 |
HIP 4979 |
37.29 |
| 2026-05-17 00:00 |
01:02:11.88 |
+01:01:41.3 |
HIP 4979 |
31.65 |
| 2026-05-17 12:00 |
01:02:34.43 |
+01:03:37.1 |
HIP 4979 |
26.18 |
| 2026-05-18 00:00 |
01:02:56.93 |
+01:05:32.3 |
HIP 4979 |
20.99 |
| 2026-05-18 12:00 |
01:03:19.36 |
+01:07:26.9 |
HIP 4979 |
16.34 |
| 2026-05-19 00:00 |
01:03:41.74 |
+01:09:20.9 |
HIP 4979 |
12.80 |
| 2026-05-19 12:00 |
01:04:04.06 |
+01:11:14.2 |
HIP 4979 |
11.42 |
| 2026-05-20 00:00 |
01:04:26.32 |
+01:13:07.0 |
HIP 4979 |
12.90 |
| 2026-05-20 12:00 |
01:04:48.52 |
+01:14:59.1 |
HIP 5123 |
12.77 |
| 2026-05-21 00:00 |
01:05:10.65 |
+01:16:50.5 |
HIP 5123 |
8.39 |
| 2026-05-21 12:00 |
01:05:32.73 |
+01:18:41.4 |
HIP 5123 |
6.77 |
| 2026-05-22 00:00 |
01:05:54.74 |
+01:20:31.6 |
HIP 5123 |
9.41 |
| 2026-05-22 12:00 |
01:06:16.70 |
+01:22:21.1 |
HIP 5257 |
14.07 |
| 2026-05-23 00:00 |
01:06:38.58 |
+01:24:10.0 |
HIP 5257 |
9.02 |
| 2026-05-23 12:00 |
01:07:00.41 |
+01:25:58.3 |
HIP 5257 |
5.60 |
| 2026-05-24 00:00 |
01:07:22.17 |
+01:27:45.9 |
HIP 5257 |
6.86 |
| 2026-05-24 12:00 |
01:07:43.86 |
+01:29:32.8 |
HIP 5257 |
11.31 |
| 2026-05-25 00:00 |
01:08:05.49 |
+01:31:19.1 |
HIP 5257 |
16.53 |
| 2026-05-25 12:00 |
01:08:27.05 |
+01:33:04.8 |
HIP 5257 |
21.97 |
| 2026-05-26 00:00 |
01:08:48.55 |
+01:34:49.7 |
HIP 5448 |
25.55 |
| 2026-05-26 12:00 |
01:09:09.97 |
+01:36:34.0 |
HIP 5448 |
24.65 |
| 2026-05-27 00:00 |
01:09:31.33 |
+01:38:17.6 |
HIP 5448 |
25.01 |
| 2026-05-27 12:00 |
01:09:52.62 |
+01:40:00.6 |
HIP 5448 |
26.56 |
| 2026-05-28 00:00 |
01:10:13.84 |
+01:41:42.8 |
HIP 5448 |
29.10 |
| 2026-05-28 12:00 |
01:10:34.99 |
+01:43:24.4 |
HIP 5448 |
32.40 |
| 2026-05-29 00:00 |
01:10:56.07 |
+01:45:05.3 |
HIP 5448 |
36.23 |
| 2026-05-29 12:00 |
01:11:17.08 |
+01:46:45.5 |
HIP 5448 |
40.43 |
| 2026-05-30 00:00 |
01:11:38.02 |
+01:48:25.0 |
HIP 5510 |
41.57 |
| 2026-05-30 12:00 |
01:11:58.88 |
+01:50:03.8 |
HIP 5783 |
38.59 |
| 2026-05-31 00:00 |
01:12:19.67 |
+01:51:41.9 |
HIP 5783 |
35.26 |
| 2026-05-31 12:00 |
01:12:40.39 |
+01:53:19.3 |
HIP 5783 |
32.51 |
| 2026-06-01 00:00 |
01:13:01.03 |
+01:54:56.0 |
HIP 5783 |
30.48 |
| 2026-06-01 12:00 |
01:13:21.60 |
+01:56:31.9 |
HIP 5818 |
29.09 |
| 2026-06-02 00:00 |
01:13:42.09 |
+01:58:07.2 |
HIP 5818 |
24.61 |