메타데이터
| 항목 |
값 |
| Designation |
C/2014 W9 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-15T16:56:21.163200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
13.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-01-29.0000000 |
| e |
0.85784434 |
| q (au) |
1.587455 |
| a (au) |
11.167021 |
| i (deg) |
10.630531 |
| Ω (om, deg) |
21.288616 |
| ω (w, deg) |
167.769440 |
| M (ma, deg) |
359.532358 |
밝기
산란 + 전체 선형
$$
M_a = (14.130 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.130 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.833 |
| k |
0.986 |
| δ90 |
1.000 |
| 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 |
23:59:38.91 |
-04:28:50.4 |
HIP 18 |
26.97 |
| 2026-03-26 12:00 |
23:59:44.99 |
-04:28:10.1 |
HIP 18 |
25.89 |
| 2026-03-27 00:00 |
23:59:51.06 |
-04:27:29.9 |
HIP 18 |
24.87 |
| 2026-03-27 12:00 |
23:59:57.13 |
-04:26:49.8 |
HIP 18 |
23.92 |
| 2026-03-28 00:00 |
00:00:03.20 |
-04:26:09.7 |
HIP 18 |
23.06 |
| 2026-03-28 12:00 |
00:00:09.25 |
-04:25:29.8 |
HIP 18 |
22.29 |
| 2026-03-29 00:00 |
00:00:15.30 |
-04:24:50.0 |
HIP 18 |
21.62 |
| 2026-03-29 12:00 |
00:00:21.35 |
-04:24:10.2 |
HIP 18 |
21.06 |
| 2026-03-30 00:00 |
00:00:27.39 |
-04:23:30.6 |
HIP 18 |
20.61 |
| 2026-03-30 12:00 |
00:00:33.42 |
-04:22:51.1 |
HIP 18 |
20.29 |
| 2026-03-31 00:00 |
00:00:39.44 |
-04:22:11.6 |
HIP 18 |
20.10 |
| 2026-03-31 12:00 |
00:00:45.45 |
-04:21:32.3 |
HIP 18 |
20.05 |
| 2026-04-01 00:00 |
00:00:51.46 |
-04:20:53.1 |
HIP 18 |
20.13 |
| 2026-04-01 12:00 |
00:00:57.46 |
-04:20:14.0 |
HIP 18 |
20.34 |
| 2026-04-02 00:00 |
00:01:03.45 |
-04:19:35.0 |
HIP 18 |
20.67 |
| 2026-04-02 12:00 |
00:01:09.42 |
-04:18:56.2 |
HIP 18 |
21.13 |
| 2026-04-03 00:00 |
00:01:15.39 |
-04:18:17.4 |
HIP 18 |
21.70 |
| 2026-04-03 12:00 |
00:01:21.35 |
-04:17:38.8 |
HIP 18 |
22.37 |
| 2026-04-04 00:00 |
00:01:27.30 |
-04:17:00.3 |
HIP 18 |
23.14 |
| 2026-04-04 12:00 |
00:01:33.24 |
-04:16:21.9 |
HIP 18 |
23.99 |
| 2026-04-05 00:00 |
00:01:39.17 |
-04:15:43.6 |
HIP 18 |
24.91 |
| 2026-04-05 12:00 |
00:01:45.09 |
-04:15:05.5 |
HIP 267 |
24.62 |
| 2026-04-06 00:00 |
00:01:50.99 |
-04:14:27.4 |
HIP 267 |
23.04 |
| 2026-04-06 12:00 |
00:01:56.89 |
-04:13:49.6 |
HIP 267 |
21.46 |
| 2026-04-07 00:00 |
00:02:02.77 |
-04:13:11.8 |
HIP 267 |
19.89 |
| 2026-04-07 12:00 |
00:02:08.64 |
-04:12:34.2 |
HIP 267 |
18.32 |
| 2026-04-08 00:00 |
00:02:14.50 |
-04:11:56.7 |
HIP 267 |
16.77 |
| 2026-04-08 12:00 |
00:02:20.34 |
-04:11:19.4 |
HIP 267 |
15.22 |
| 2026-04-09 00:00 |
00:02:26.17 |
-04:10:42.2 |
HIP 267 |
13.69 |
| 2026-04-09 12:00 |
00:02:31.98 |
-04:10:05.1 |
HIP 267 |
12.17 |
| 2026-04-10 00:00 |
00:02:37.79 |
-04:09:28.2 |
HIP 267 |
10.67 |
| 2026-04-10 12:00 |
00:02:43.57 |
-04:08:51.5 |
HIP 267 |
9.21 |
| 2026-04-11 00:00 |
00:02:49.35 |
-04:08:14.8 |
HIP 267 |
7.78 |
| 2026-04-11 12:00 |
00:02:55.11 |
-04:07:38.4 |
HIP 267 |
6.43 |
| 2026-04-12 00:00 |
00:03:00.85 |
-04:07:02.1 |
HIP 267 |
5.19 |
| 2026-04-12 12:00 |
00:03:06.57 |
-04:06:25.9 |
HIP 267 |
4.17 |
| 2026-04-13 00:00 |
00:03:12.28 |
-04:05:49.9 |
HIP 267 |
3.56 |
| 2026-04-13 12:00 |
00:03:17.98 |
-04:05:14.1 |
HIP 267 |
3.56 |
| 2026-04-14 00:00 |
00:03:23.66 |
-04:04:38.4 |
HIP 267 |
4.18 |
| 2026-04-14 12:00 |
00:03:29.32 |
-04:04:02.9 |
HIP 267 |
5.18 |
| 2026-04-15 00:00 |
00:03:34.96 |
-04:03:27.6 |
HIP 267 |
6.40 |
| 2026-04-15 12:00 |
00:03:40.58 |
-04:02:52.4 |
HIP 267 |
7.72 |
| 2026-04-16 00:00 |
00:03:46.19 |
-04:02:17.4 |
HIP 267 |
9.09 |