메타데이터
| 항목 |
값 |
| Designation |
P/2013 G4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-09T16:30:18.377280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:32Z |
| Obs used |
41 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-04-25.0000000 |
| e |
0.41041543 |
| q (au) |
2.613194 |
| a (au) |
4.432263 |
| i (deg) |
5.925606 |
| Ω (om, deg) |
339.772839 |
| ω (w, deg) |
214.390935 |
| M (ma, deg) |
7.849220 |
밝기
산란 + 전체 선형
$$
M_a = (19.266 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
19.266 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.647 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:52:30.48 |
+00:54:23.7 |
HIP 117832 |
27.63 |
| 2026-03-26 12:00 |
23:52:50.38 |
+00:56:42.3 |
HIP 117832 |
26.01 |
| 2026-03-27 00:00 |
23:53:10.26 |
+00:59:00.9 |
HIP 117832 |
25.49 |
| 2026-03-27 12:00 |
23:53:30.13 |
+01:01:19.3 |
HIP 117832 |
26.14 |
| 2026-03-28 00:00 |
23:53:49.98 |
+01:03:37.8 |
HIP 117832 |
27.86 |
| 2026-03-28 12:00 |
23:54:09.81 |
+01:05:56.1 |
HIP 117832 |
30.49 |
| 2026-03-29 00:00 |
23:54:29.62 |
+01:08:14.4 |
HIP 117960 |
31.24 |
| 2026-03-29 12:00 |
23:54:49.42 |
+01:10:32.7 |
HIP 118035 |
26.23 |
| 2026-03-30 00:00 |
23:55:09.19 |
+01:12:50.8 |
HIP 118035 |
21.01 |
| 2026-03-30 12:00 |
23:55:28.95 |
+01:15:08.9 |
HIP 118035 |
15.96 |
| 2026-03-31 00:00 |
23:55:48.69 |
+01:17:27.0 |
HIP 118035 |
11.28 |
| 2026-03-31 12:00 |
23:56:08.40 |
+01:19:44.9 |
HIP 118035 |
7.69 |
| 2026-04-01 00:00 |
23:56:28.10 |
+01:22:02.8 |
HIP 118035 |
7.08 |
| 2026-04-01 12:00 |
23:56:47.78 |
+01:24:20.6 |
HIP 118035 |
10.01 |
| 2026-04-02 00:00 |
23:57:07.43 |
+01:26:38.2 |
HIP 118035 |
14.46 |
| 2026-04-02 12:00 |
23:57:27.06 |
+01:28:55.8 |
HIP 118035 |
19.40 |
| 2026-04-03 00:00 |
23:57:46.67 |
+01:31:13.3 |
HIP 118035 |
24.54 |
| 2026-04-03 12:00 |
23:58:06.25 |
+01:33:30.7 |
HIP 118035 |
29.77 |
| 2026-04-04 00:00 |
23:58:25.81 |
+01:35:48.0 |
HIP 118030 |
34.66 |
| 2026-04-04 12:00 |
23:58:45.35 |
+01:38:05.2 |
HIP 1 |
37.72 |
| 2026-04-05 00:00 |
23:59:04.86 |
+01:40:22.3 |
HIP 1 |
37.66 |
| 2026-04-05 12:00 |
23:59:24.35 |
+01:42:39.3 |
HIP 1 |
38.38 |
| 2026-04-06 00:00 |
23:59:43.81 |
+01:44:56.2 |
HIP 1 |
39.81 |
| 2026-04-06 12:00 |
00:00:03.24 |
+01:47:12.9 |
HIP 1 |
41.88 |
| 2026-04-07 00:00 |
00:00:22.65 |
+01:49:29.5 |
HIP 223 |
40.49 |
| 2026-04-07 12:00 |
00:00:42.03 |
+01:51:46.0 |
HIP 223 |
35.14 |
| 2026-04-08 00:00 |
00:01:01.38 |
+01:54:02.3 |
HIP 223 |
29.80 |
| 2026-04-08 12:00 |
00:01:20.70 |
+01:56:18.5 |
HIP 223 |
24.47 |
| 2026-04-09 00:00 |
00:01:39.99 |
+01:58:34.6 |
HIP 223 |
19.15 |
| 2026-04-09 12:00 |
00:01:59.26 |
+02:00:50.6 |
HIP 223 |
13.85 |
| 2026-04-10 00:00 |
00:02:18.49 |
+02:03:06.3 |
HIP 223 |
8.57 |
| 2026-04-10 12:00 |
00:02:37.69 |
+02:05:22.0 |
HIP 223 |
3.41 |
| 2026-04-11 00:00 |
00:02:56.86 |
+02:07:37.5 |
HIP 223 |
2.44 |
| 2026-04-11 12:00 |
00:03:16.00 |
+02:09:52.8 |
HIP 223 |
7.50 |
| 2026-04-12 00:00 |
00:03:35.11 |
+02:12:07.9 |
HIP 223 |
12.73 |
| 2026-04-12 12:00 |
00:03:54.18 |
+02:14:22.9 |
HIP 223 |
17.99 |
| 2026-04-13 00:00 |
00:04:13.21 |
+02:16:37.7 |
HIP 429 |
15.95 |
| 2026-04-13 12:00 |
00:04:32.22 |
+02:18:52.4 |
HIP 429 |
10.70 |
| 2026-04-14 00:00 |
00:04:51.18 |
+02:21:06.9 |
HIP 429 |
5.47 |
| 2026-04-14 12:00 |
00:05:10.12 |
+02:23:21.1 |
HIP 429 |
0.49 |
| 2026-04-15 00:00 |
00:05:29.01 |
+02:25:35.2 |
HIP 429 |
5.02 |
| 2026-04-15 12:00 |
00:05:47.87 |
+02:27:49.1 |
HIP 429 |
10.23 |
| 2026-04-16 00:00 |
00:06:06.69 |
+02:30:02.8 |
HIP 429 |
15.42 |