메타데이터
| 항목 |
값 |
| Designation |
P/2014 W4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-29T12:04:50.476800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:02Z |
| Obs used |
91 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
15.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-09-14.0000000 |
| e |
0.35307752 |
| q (au) |
4.261090 |
| a (au) |
6.586710 |
| i (deg) |
15.274347 |
| Ω (om, deg) |
33.352591 |
| ω (w, deg) |
67.411788 |
| M (ma, deg) |
353.790386 |
밝기
산란 + 전체 선형
$$
M_a = (6.548 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.548 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
20:48:05.44 |
-35:49:38.9 |
HIP 102496 |
27.85 |
| 2026-07-29 12:00 |
20:47:52.35 |
-35:50:23.2 |
HIP 102496 |
25.35 |
| 2026-07-30 00:00 |
20:47:39.25 |
-35:51:06.9 |
HIP 102496 |
22.91 |
| 2026-07-30 12:00 |
20:47:26.13 |
-35:51:50.0 |
HIP 102496 |
20.57 |
| 2026-07-31 00:00 |
20:47:13.01 |
-35:52:32.3 |
HIP 102496 |
18.34 |
| 2026-07-31 12:00 |
20:46:59.87 |
-35:53:14.0 |
HIP 102496 |
16.27 |
| 2026-08-01 00:00 |
20:46:46.73 |
-35:53:55.0 |
HIP 102496 |
14.45 |
| 2026-08-01 12:00 |
20:46:33.58 |
-35:54:35.4 |
HIP 102496 |
12.97 |
| 2026-08-02 00:00 |
20:46:20.43 |
-35:55:15.0 |
HIP 102496 |
11.96 |
| 2026-08-02 12:00 |
20:46:07.27 |
-35:55:53.9 |
HIP 102496 |
11.53 |
| 2026-08-03 00:00 |
20:45:54.12 |
-35:56:32.2 |
HIP 102496 |
11.76 |
| 2026-08-03 12:00 |
20:45:40.96 |
-35:57:09.7 |
HIP 102496 |
12.59 |
| 2026-08-04 00:00 |
20:45:27.80 |
-35:57:46.6 |
HIP 102381 |
12.49 |
| 2026-08-04 12:00 |
20:45:14.65 |
-35:58:22.7 |
HIP 102381 |
11.08 |
| 2026-08-05 00:00 |
20:45:01.51 |
-35:58:58.1 |
HIP 102381 |
10.20 |
| 2026-08-05 12:00 |
20:44:48.37 |
-35:59:32.8 |
HIP 102381 |
10.01 |
| 2026-08-06 00:00 |
20:44:35.25 |
-36:00:06.7 |
HIP 102381 |
10.52 |
| 2026-08-06 12:00 |
20:44:22.13 |
-36:00:40.0 |
HIP 102381 |
11.65 |
| 2026-08-07 00:00 |
20:44:09.02 |
-36:01:12.4 |
HIP 102381 |
13.24 |
| 2026-08-07 12:00 |
20:43:55.94 |
-36:01:44.2 |
HIP 102381 |
15.13 |
| 2026-08-08 00:00 |
20:43:42.86 |
-36:02:15.2 |
HIP 102381 |
17.23 |
| 2026-08-08 12:00 |
20:43:29.81 |
-36:02:45.4 |
HIP 102381 |
19.47 |
| 2026-08-09 00:00 |
20:43:16.77 |
-36:03:14.9 |
HIP 102381 |
21.79 |
| 2026-08-09 12:00 |
20:43:03.76 |
-36:03:43.7 |
HIP 102381 |
24.18 |
| 2026-08-10 00:00 |
20:42:50.77 |
-36:04:11.6 |
HIP 102381 |
26.62 |
| 2026-08-10 12:00 |
20:42:37.81 |
-36:04:38.8 |
HIP 102381 |
29.08 |
| 2026-08-11 00:00 |
20:42:24.87 |
-36:05:05.3 |
HIP 102013 |
30.71 |
| 2026-08-11 12:00 |
20:42:11.96 |
-36:05:30.9 |
HIP 101968 |
28.42 |
| 2026-08-12 00:00 |
20:41:59.09 |
-36:05:55.8 |
HIP 101968 |
25.89 |
| 2026-08-12 12:00 |
20:41:46.24 |
-36:06:19.9 |
HIP 101968 |
23.40 |
| 2026-08-13 00:00 |
20:41:33.43 |
-36:06:43.2 |
HIP 101968 |
20.95 |
| 2026-08-13 12:00 |
20:41:20.66 |
-36:07:05.7 |
HIP 101968 |
18.54 |
| 2026-08-14 00:00 |
20:41:07.93 |
-36:07:27.5 |
HIP 101968 |
16.20 |
| 2026-08-14 12:00 |
20:40:55.24 |
-36:07:48.4 |
HIP 101968 |
13.95 |
| 2026-08-15 00:00 |
20:40:42.58 |
-36:08:08.6 |
HIP 101968 |
11.85 |
| 2026-08-15 12:00 |
20:40:29.98 |
-36:08:27.9 |
HIP 101968 |
9.96 |
| 2026-08-16 00:00 |
20:40:17.42 |
-36:08:46.5 |
HIP 101968 |
8.44 |
| 2026-08-16 12:00 |
20:40:04.90 |
-36:09:04.2 |
HIP 101968 |
7.50 |
| 2026-08-17 00:00 |
20:39:52.44 |
-36:09:21.2 |
HIP 101968 |
7.35 |
| 2026-08-17 12:00 |
20:39:40.02 |
-36:09:37.3 |
HIP 101968 |
8.02 |
| 2026-08-18 00:00 |
20:39:27.66 |
-36:09:52.7 |
HIP 101968 |
9.33 |
| 2026-08-18 12:00 |
20:39:15.35 |
-36:10:07.2 |
HIP 101968 |
11.04 |
| 2026-08-19 00:00 |
20:39:03.10 |
-36:10:20.9 |
HIP 101908 |
11.01 |