메타데이터
| 항목 |
값 |
| Designation |
73P/Schwassmann-Wachmann 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-25T14:11:28.976640Z |
| Orbit solution date (soln_date, UTC) |
2025-08-20T11:15:26Z |
| Obs used |
515 |
| NEO |
Yes |
| M1 |
14.300 |
| K1 |
8.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-10-05.0000000 |
| e |
0.68565940 |
| q (au) |
0.972305 |
| a (au) |
3.093157 |
| i (deg) |
11.232390 |
| Ω (om, deg) |
69.644230 |
| ω (w, deg) |
199.450713 |
| M (ma, deg) |
235.062452 |
밝기
산란 + 전체 선형
$$
M_a = (13.529 + 3.580\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.529 |
| n |
3.580 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2021-01-13 |
2022-07-21 |
+1.3941 |
-0.399 |
| 2022-07-21 |
2022-08-23 |
-39.7191 |
+1.616 |
| 2022-08-25 |
2022-10-19 |
-39.2655 |
+0.068 |
| 2022-10-19 |
2023-08-15 |
+7.1396 |
-4.477 |
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 |
06:04:47.97 |
+28:17:53.8 |
HIP 28748 |
6.99 |
| 2026-03-26 12:00 |
06:04:55.87 |
+28:17:29.6 |
HIP 28748 |
8.74 |
| 2026-03-27 00:00 |
06:05:03.98 |
+28:17:05.4 |
HIP 28748 |
10.56 |
| 2026-03-27 12:00 |
06:05:12.32 |
+28:16:41.2 |
HIP 28748 |
12.42 |
| 2026-03-28 00:00 |
06:05:20.87 |
+28:16:17.0 |
HIP 28748 |
14.34 |
| 2026-03-28 12:00 |
06:05:29.64 |
+28:15:52.9 |
HIP 28748 |
16.31 |
| 2026-03-29 00:00 |
06:05:38.62 |
+28:15:28.8 |
HIP 28748 |
18.32 |
| 2026-03-29 12:00 |
06:05:47.81 |
+28:15:04.7 |
HIP 28920 |
19.96 |
| 2026-03-30 00:00 |
06:05:57.21 |
+28:14:40.7 |
HIP 28920 |
19.03 |
| 2026-03-30 12:00 |
06:06:06.83 |
+28:14:16.6 |
HIP 28920 |
18.30 |
| 2026-03-31 00:00 |
06:06:16.65 |
+28:13:52.7 |
HIP 28920 |
17.80 |
| 2026-03-31 12:00 |
06:06:26.68 |
+28:13:28.7 |
HIP 28920 |
17.57 |
| 2026-04-01 00:00 |
06:06:36.91 |
+28:13:04.8 |
HIP 29051 |
15.92 |
| 2026-04-01 12:00 |
06:06:47.35 |
+28:12:40.9 |
HIP 29051 |
13.66 |
| 2026-04-02 00:00 |
06:06:57.99 |
+28:12:17.0 |
HIP 29051 |
11.39 |
| 2026-04-02 12:00 |
06:07:08.83 |
+28:11:53.1 |
HIP 29051 |
9.13 |
| 2026-04-03 00:00 |
06:07:19.88 |
+28:11:29.3 |
HIP 29051 |
6.96 |
| 2026-04-03 12:00 |
06:07:31.12 |
+28:11:05.5 |
HIP 29051 |
5.03 |
| 2026-04-04 00:00 |
06:07:42.57 |
+28:10:41.7 |
HIP 29051 |
3.85 |
| 2026-04-04 12:00 |
06:07:54.21 |
+28:10:17.9 |
HIP 29051 |
4.20 |
| 2026-04-05 00:00 |
06:08:06.04 |
+28:09:54.2 |
HIP 29051 |
5.86 |
| 2026-04-05 12:00 |
06:08:18.08 |
+28:09:30.4 |
HIP 29051 |
8.10 |
| 2026-04-06 00:00 |
06:08:30.30 |
+28:09:06.7 |
HIP 29051 |
10.59 |
| 2026-04-06 12:00 |
06:08:42.72 |
+28:08:43.0 |
HIP 29051 |
13.21 |
| 2026-04-07 00:00 |
06:08:55.34 |
+28:08:19.3 |
HIP 29051 |
15.93 |
| 2026-04-07 12:00 |
06:09:08.14 |
+28:07:55.6 |
HIP 29051 |
18.72 |
| 2026-04-08 00:00 |
06:09:21.13 |
+28:07:31.9 |
HIP 29051 |
21.56 |
| 2026-04-08 12:00 |
06:09:34.31 |
+28:07:08.2 |
HIP 29051 |
24.46 |
| 2026-04-09 00:00 |
06:09:47.68 |
+28:06:44.5 |
HIP 29051 |
27.41 |
| 2026-04-09 12:00 |
06:10:01.23 |
+28:06:20.8 |
HIP 29051 |
30.40 |
| 2026-04-10 00:00 |
06:10:14.97 |
+28:05:57.1 |
HIP 29051 |
33.44 |
| 2026-04-10 12:00 |
06:10:28.90 |
+28:05:33.4 |
HIP 29051 |
36.52 |
| 2026-04-11 00:00 |
06:10:43.00 |
+28:05:09.7 |
HIP 29198 |
38.07 |
| 2026-04-11 12:00 |
06:10:57.29 |
+28:04:46.0 |
HIP 29554 |
39.35 |
| 2026-04-12 00:00 |
06:11:11.76 |
+28:04:22.3 |
HIP 29554 |
36.67 |
| 2026-04-12 12:00 |
06:11:26.41 |
+28:03:58.6 |
HIP 29554 |
34.04 |
| 2026-04-13 00:00 |
06:11:41.24 |
+28:03:34.8 |
HIP 29554 |
31.50 |
| 2026-04-13 12:00 |
06:11:56.24 |
+28:03:11.1 |
HIP 29554 |
29.08 |
| 2026-04-14 00:00 |
06:12:11.42 |
+28:02:47.3 |
HIP 29554 |
26.82 |
| 2026-04-14 12:00 |
06:12:26.78 |
+28:02:23.5 |
HIP 29554 |
24.79 |
| 2026-04-15 00:00 |
06:12:42.31 |
+28:01:59.7 |
HIP 29554 |
23.07 |
| 2026-04-15 12:00 |
06:12:58.02 |
+28:01:35.9 |
HIP 29554 |
21.75 |
| 2026-04-16 00:00 |
06:13:13.89 |
+28:01:12.0 |
HIP 29554 |
20.92 |