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) |
| 2026-03-26 00:00 |
00:02:42.06 |
-01:43:54.3 |
HIP 134 |
38.55 |
| 2026-03-26 12:00 |
00:03:04.49 |
-01:41:32.9 |
HIP 438 |
34.03 |
| 2026-03-27 00:00 |
00:03:26.91 |
-01:39:11.6 |
HIP 438 |
29.13 |
| 2026-03-27 12:00 |
00:03:49.32 |
-01:36:50.5 |
HIP 438 |
24.76 |
| 2026-03-28 00:00 |
00:04:11.71 |
-01:34:29.5 |
HIP 438 |
21.24 |
| 2026-03-28 12:00 |
00:04:34.10 |
-01:32:08.6 |
HIP 438 |
19.06 |
| 2026-03-29 00:00 |
00:04:56.48 |
-01:29:47.8 |
HIP 438 |
18.68 |
| 2026-03-29 12:00 |
00:05:18.85 |
-01:27:27.2 |
HIP 521 |
19.92 |
| 2026-03-30 00:00 |
00:05:41.20 |
-01:25:06.7 |
HIP 521 |
14.32 |
| 2026-03-30 12:00 |
00:06:03.55 |
-01:22:46.4 |
HIP 521 |
9.30 |
| 2026-03-31 00:00 |
00:06:25.88 |
-01:20:26.3 |
HIP 521 |
6.42 |
| 2026-03-31 12:00 |
00:06:48.19 |
-01:18:06.2 |
HIP 521 |
8.31 |
| 2026-04-01 00:00 |
00:07:10.50 |
-01:15:46.4 |
HIP 521 |
13.04 |
| 2026-04-01 12:00 |
00:07:32.78 |
-01:13:26.7 |
HIP 521 |
18.54 |
| 2026-04-02 00:00 |
00:07:55.06 |
-01:11:07.2 |
HIP 521 |
24.30 |
| 2026-04-02 12:00 |
00:08:17.32 |
-01:08:47.8 |
HIP 752 |
27.45 |
| 2026-04-03 00:00 |
00:08:39.56 |
-01:06:28.7 |
HIP 752 |
22.92 |
| 2026-04-03 12:00 |
00:09:01.78 |
-01:04:09.7 |
HIP 752 |
19.23 |
| 2026-04-04 00:00 |
00:09:23.99 |
-01:01:50.8 |
HIP 752 |
16.94 |
| 2026-04-04 12:00 |
00:09:46.18 |
-00:59:32.2 |
HIP 752 |
16.63 |
| 2026-04-05 00:00 |
00:10:08.36 |
-00:57:13.8 |
HIP 752 |
18.38 |
| 2026-04-05 12:00 |
00:10:30.51 |
-00:54:55.5 |
HIP 925 |
19.60 |
| 2026-04-06 00:00 |
00:10:52.65 |
-00:52:37.5 |
HIP 925 |
17.61 |
| 2026-04-06 12:00 |
00:11:14.77 |
-00:50:19.6 |
HIP 925 |
17.55 |
| 2026-04-07 00:00 |
00:11:36.86 |
-00:48:02.0 |
HIP 925 |
19.42 |
| 2026-04-07 12:00 |
00:11:58.94 |
-00:45:44.6 |
HIP 925 |
22.76 |
| 2026-04-08 00:00 |
00:12:20.99 |
-00:43:27.3 |
HIP 925 |
27.01 |
| 2026-04-08 12:00 |
00:12:43.03 |
-00:41:10.3 |
HIP 968 |
29.49 |
| 2026-04-09 00:00 |
00:13:05.04 |
-00:38:53.6 |
HIP 968 |
30.01 |
| 2026-04-09 12:00 |
00:13:27.03 |
-00:36:37.0 |
HIP 1082 |
27.76 |
| 2026-04-10 00:00 |
00:13:48.99 |
-00:34:20.7 |
HIP 1189 |
22.25 |
| 2026-04-10 12:00 |
00:14:10.93 |
-00:32:04.6 |
HIP 1189 |
17.01 |
| 2026-04-11 00:00 |
00:14:32.85 |
-00:29:48.8 |
HIP 1189 |
12.41 |
| 2026-04-11 12:00 |
00:14:54.74 |
-00:27:33.2 |
HIP 1189 |
9.45 |
| 2026-04-12 00:00 |
00:15:16.60 |
-00:25:17.8 |
HIP 1189 |
9.72 |
| 2026-04-12 12:00 |
00:15:38.44 |
-00:23:02.8 |
HIP 1189 |
13.02 |
| 2026-04-13 00:00 |
00:16:00.25 |
-00:20:47.9 |
HIP 1189 |
17.72 |
| 2026-04-13 12:00 |
00:16:22.04 |
-00:18:33.4 |
HIP 1189 |
22.98 |
| 2026-04-14 00:00 |
00:16:43.79 |
-00:16:19.1 |
HIP 1189 |
28.47 |
| 2026-04-14 12:00 |
00:17:05.52 |
-00:14:05.0 |
HIP 1397 |
33.85 |
| 2026-04-15 00:00 |
00:17:27.21 |
-00:11:51.3 |
HIP 1397 |
31.12 |
| 2026-04-15 12:00 |
00:17:48.88 |
-00:09:37.8 |
HIP 1397 |
29.32 |
| 2026-04-16 00:00 |
00:18:10.52 |
-00:07:24.7 |
HIP 1397 |
28.64 |