메타데이터
| 항목 |
값 |
| Designation |
C/2014 W2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-03-10T11:35:51.728640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
3410 |
| NEO |
- |
| M1 |
8.100 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-02-17.0000000 |
| e |
0.99831735 |
| q (au) |
2.670189 |
| a (au) |
1586.896022 |
| i (deg) |
81.998562 |
| Ω (om, deg) |
69.962778 |
| ω (w, deg) |
85.009454 |
| M (ma, deg) |
359.999649 |
밝기
산란 + 전체 선형
$$
M_a = (8.719 + 2.968\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.719 |
| n |
2.968 |
| gf |
1.000 |
| gb |
-0.730 |
| k |
0.994 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2014-10-24 |
2015-09-28 |
+2.5743 |
-1.749 |
| 2015-09-28 |
2016-03-10 |
+6.8475 |
-3.627 |
| 2016-03-10 |
2016-10-09 |
+7.6354 |
-3.819 |
| 2016-10-09 |
2017-09-11 |
-0.5717 |
+0.375 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
16:37:56.00 |
-69:56:12.6 |
HIP 81658 |
15.34 |
| 2026-05-12 12:00 |
16:37:42.36 |
-69:56:32.4 |
HIP 81554 |
15.97 |
| 2026-05-13 00:00 |
16:37:28.67 |
-69:56:51.6 |
HIP 81554 |
16.36 |
| 2026-05-13 12:00 |
16:37:14.93 |
-69:57:10.4 |
HIP 81554 |
16.83 |
| 2026-05-14 00:00 |
16:37:01.14 |
-69:57:28.5 |
HIP 81554 |
17.38 |
| 2026-05-14 12:00 |
16:36:47.31 |
-69:57:46.2 |
HIP 81554 |
18.00 |
| 2026-05-15 00:00 |
16:36:33.43 |
-69:58:03.3 |
HIP 81554 |
18.70 |
| 2026-05-15 12:00 |
16:36:19.51 |
-69:58:19.8 |
HIP 81554 |
19.45 |
| 2026-05-16 00:00 |
16:36:05.55 |
-69:58:35.9 |
HIP 81554 |
20.25 |
| 2026-05-16 12:00 |
16:35:51.54 |
-69:58:51.3 |
HIP 81554 |
21.10 |
| 2026-05-17 00:00 |
16:35:37.50 |
-69:59:06.3 |
HIP 81554 |
22.00 |
| 2026-05-17 12:00 |
16:35:23.42 |
-69:59:20.6 |
HIP 80978 |
21.25 |
| 2026-05-18 00:00 |
16:35:09.31 |
-69:59:34.5 |
HIP 80978 |
20.48 |
| 2026-05-18 12:00 |
16:34:55.16 |
-69:59:47.7 |
HIP 80978 |
19.74 |
| 2026-05-19 00:00 |
16:34:40.98 |
-70:00:00.5 |
HIP 80978 |
19.05 |
| 2026-05-19 12:00 |
16:34:26.77 |
-70:00:12.6 |
HIP 80978 |
18.40 |
| 2026-05-20 00:00 |
16:34:12.53 |
-70:00:24.2 |
HIP 80978 |
17.81 |
| 2026-05-20 12:00 |
16:33:58.26 |
-70:00:35.3 |
HIP 80978 |
17.28 |
| 2026-05-21 00:00 |
16:33:43.96 |
-70:00:45.8 |
HIP 80978 |
16.82 |
| 2026-05-21 12:00 |
16:33:29.64 |
-70:00:55.8 |
HIP 80978 |
16.42 |
| 2026-05-22 00:00 |
16:33:15.29 |
-70:01:05.2 |
HIP 80978 |
16.11 |
| 2026-05-22 12:00 |
16:33:00.92 |
-70:01:14.0 |
HIP 80978 |
15.87 |
| 2026-05-23 00:00 |
16:32:46.53 |
-70:01:22.3 |
HIP 80978 |
15.73 |
| 2026-05-23 12:00 |
16:32:32.13 |
-70:01:30.1 |
HIP 80978 |
15.67 |
| 2026-05-24 00:00 |
16:32:17.70 |
-70:01:37.3 |
HIP 80978 |
15.70 |
| 2026-05-24 12:00 |
16:32:03.25 |
-70:01:43.9 |
HIP 80978 |
15.82 |
| 2026-05-25 00:00 |
16:31:48.80 |
-70:01:50.0 |
HIP 80978 |
16.02 |
| 2026-05-25 12:00 |
16:31:34.32 |
-70:01:55.5 |
HIP 80686 |
16.21 |
| 2026-05-26 00:00 |
16:31:19.84 |
-70:02:00.5 |
HIP 80686 |
14.99 |
| 2026-05-26 12:00 |
16:31:05.34 |
-70:02:04.9 |
HIP 80686 |
13.76 |
| 2026-05-27 00:00 |
16:30:50.83 |
-70:02:08.8 |
HIP 80686 |
12.54 |
| 2026-05-27 12:00 |
16:30:36.32 |
-70:02:12.1 |
HIP 80686 |
11.33 |
| 2026-05-28 00:00 |
16:30:21.80 |
-70:02:14.9 |
HIP 80686 |
10.12 |
| 2026-05-28 12:00 |
16:30:07.27 |
-70:02:17.1 |
HIP 80686 |
8.93 |
| 2026-05-29 00:00 |
16:29:52.74 |
-70:02:18.8 |
HIP 80686 |
7.75 |
| 2026-05-29 12:00 |
16:29:38.20 |
-70:02:19.9 |
HIP 80686 |
6.60 |
| 2026-05-30 00:00 |
16:29:23.67 |
-70:02:20.5 |
HIP 80686 |
5.49 |
| 2026-05-30 12:00 |
16:29:09.13 |
-70:02:20.5 |
HIP 80686 |
4.46 |
| 2026-05-31 00:00 |
16:28:54.60 |
-70:02:20.0 |
HIP 80686 |
3.57 |
| 2026-05-31 12:00 |
16:28:40.07 |
-70:02:18.9 |
HIP 80686 |
2.96 |
| 2026-06-01 00:00 |
16:28:25.54 |
-70:02:17.3 |
HIP 80686 |
2.80 |
| 2026-06-01 12:00 |
16:28:11.02 |
-70:02:15.1 |
HIP 80686 |
3.17 |
| 2026-06-02 00:00 |
16:27:56.50 |
-70:02:12.4 |
HIP 80686 |
3.92 |