메타데이터
| 항목 |
값 |
| Designation |
81P/Wild 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-12-15T18:49:47.694720Z |
| Orbit solution date (soln_date, UTC) |
2024-09-12T12:06:16Z |
| Obs used |
2795 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-11-21.0000000 |
| e |
0.53739891 |
| q (au) |
1.595856 |
| a (au) |
3.449746 |
| i (deg) |
3.237004 |
| Ω (om, deg) |
136.110221 |
| ω (w, deg) |
41.725231 |
| M (ma, deg) |
187.596681 |
밝기
산란 + 전체 선형
$$
M_a = (9.658 + 5.323\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.658 |
| n |
5.323 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.894 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2020-09-17 |
2022-12-15 |
+5.7911 |
-3.099 |
| 2022-12-15 |
2023-03-16 |
+32.4001 |
-7.929 |
| 2023-03-16 |
2024-09-07 |
-2.8049 |
+1.007 |
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 |
00:35:57.11 |
+01:39:31.3 |
HIP 2834 |
18.41 |
| 2026-05-12 12:00 |
00:36:16.21 |
+01:41:23.0 |
HIP 2834 |
20.82 |
| 2026-05-13 00:00 |
00:36:35.25 |
+01:43:14.1 |
HIP 2834 |
24.07 |
| 2026-05-13 12:00 |
00:36:54.23 |
+01:45:04.7 |
HIP 2834 |
27.87 |
| 2026-05-14 00:00 |
00:37:13.13 |
+01:46:54.8 |
HIP 2834 |
32.02 |
| 2026-05-14 12:00 |
00:37:31.98 |
+01:48:44.4 |
HIP 3019 |
34.72 |
| 2026-05-15 00:00 |
00:37:50.75 |
+01:50:33.4 |
HIP 2970 |
33.11 |
| 2026-05-15 12:00 |
00:38:09.46 |
+01:52:21.8 |
HIP 2970 |
31.66 |
| 2026-05-16 00:00 |
00:38:28.09 |
+01:54:09.7 |
HIP 2970 |
30.95 |
| 2026-05-16 12:00 |
00:38:46.66 |
+01:55:57.1 |
HIP 2970 |
31.05 |
| 2026-05-17 00:00 |
00:39:05.15 |
+01:57:43.8 |
HIP 2970 |
31.92 |
| 2026-05-17 12:00 |
00:39:23.58 |
+01:59:30.0 |
HIP 2970 |
33.51 |
| 2026-05-18 00:00 |
00:39:41.93 |
+02:01:15.7 |
HIP 3265 |
32.45 |
| 2026-05-18 12:00 |
00:40:00.20 |
+02:03:00.7 |
HIP 3265 |
29.64 |
| 2026-05-19 00:00 |
00:40:18.41 |
+02:04:45.2 |
HIP 3265 |
27.42 |
| 2026-05-19 12:00 |
00:40:36.53 |
+02:06:29.1 |
HIP 3265 |
25.95 |
| 2026-05-20 00:00 |
00:40:54.59 |
+02:08:12.4 |
HIP 3265 |
25.33 |
| 2026-05-20 12:00 |
00:41:12.56 |
+02:09:55.1 |
HIP 3265 |
25.61 |
| 2026-05-21 00:00 |
00:41:30.46 |
+02:11:37.2 |
HIP 3265 |
26.76 |
| 2026-05-21 12:00 |
00:41:48.28 |
+02:13:18.7 |
HIP 3399 |
24.46 |
| 2026-05-22 00:00 |
00:42:06.03 |
+02:14:59.6 |
HIP 3416 |
20.97 |
| 2026-05-22 12:00 |
00:42:23.69 |
+02:16:39.8 |
HIP 3416 |
16.37 |
| 2026-05-23 00:00 |
00:42:41.28 |
+02:18:19.5 |
HIP 3416 |
11.88 |
| 2026-05-23 12:00 |
00:42:58.78 |
+02:19:58.5 |
HIP 3416 |
7.66 |
| 2026-05-24 00:00 |
00:43:16.21 |
+02:21:37.0 |
HIP 3416 |
4.46 |
| 2026-05-24 12:00 |
00:43:33.55 |
+02:23:14.8 |
HIP 3416 |
4.92 |
| 2026-05-25 00:00 |
00:43:50.81 |
+02:24:51.9 |
HIP 3416 |
8.43 |
| 2026-05-25 12:00 |
00:44:07.98 |
+02:26:28.4 |
HIP 3416 |
12.64 |
| 2026-05-26 00:00 |
00:44:25.08 |
+02:28:04.3 |
HIP 3407 |
16.85 |
| 2026-05-26 12:00 |
00:44:42.09 |
+02:29:39.6 |
HIP 3407 |
20.32 |
| 2026-05-27 00:00 |
00:44:59.01 |
+02:31:14.2 |
HIP 3407 |
24.12 |
| 2026-05-27 12:00 |
00:45:15.85 |
+02:32:48.1 |
HIP 3652 |
25.30 |
| 2026-05-28 00:00 |
00:45:32.61 |
+02:34:21.4 |
HIP 3652 |
22.50 |
| 2026-05-28 12:00 |
00:45:49.27 |
+02:35:54.1 |
HIP 3652 |
20.31 |
| 2026-05-29 00:00 |
00:46:05.85 |
+02:37:26.1 |
HIP 3652 |
18.94 |
| 2026-05-29 12:00 |
00:46:22.34 |
+02:38:57.4 |
HIP 3652 |
18.53 |
| 2026-05-30 00:00 |
00:46:38.75 |
+02:40:28.0 |
HIP 3652 |
19.15 |
| 2026-05-30 12:00 |
00:46:55.06 |
+02:41:58.0 |
HIP 3722 |
17.89 |
| 2026-05-31 00:00 |
00:47:11.28 |
+02:43:27.3 |
HIP 3722 |
14.03 |
| 2026-05-31 12:00 |
00:47:27.42 |
+02:44:55.9 |
HIP 3722 |
10.54 |
| 2026-06-01 00:00 |
00:47:43.46 |
+02:46:23.9 |
HIP 3722 |
7.90 |
| 2026-06-01 12:00 |
00:47:59.40 |
+02:47:51.1 |
HIP 3758 |
5.40 |
| 2026-06-02 00:00 |
00:48:15.26 |
+02:49:17.7 |
HIP 3758 |
5.54 |