메타데이터
| 항목 |
값 |
| Designation |
104P/Kowal 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-01-11T14:49:09.753600Z |
| Orbit solution date (soln_date, UTC) |
2023-04-05T03:16:58Z |
| Obs used |
1551 |
| NEO |
Yes |
| M1 |
14.600 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-09-29.0000000 |
| e |
0.66545272 |
| q (au) |
1.073098 |
| a (au) |
3.207614 |
| i (deg) |
5.701090 |
| Ω (om, deg) |
207.213526 |
| ω (w, deg) |
227.245888 |
| M (ma, deg) |
342.051208 |
밝기
산란 + 전체 선형
$$
M_a = (13.882 + 3.137\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.882 |
| n |
3.137 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2021-08-11 |
2021-11-29 |
+3.2064 |
+1.741 |
| 2021-11-29 |
2022-01-11 |
+71.5132 |
-3.914 |
| 2022-01-11 |
2022-07-20 |
-2.8823 |
-1.387 |
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 |
19:42:04.48 |
-14:58:02.1 |
HIP 96738 |
32.30 |
| 2026-05-12 12:00 |
19:42:01.46 |
-14:57:21.4 |
HIP 96738 |
31.45 |
| 2026-05-13 00:00 |
19:41:58.19 |
-14:56:41.4 |
HIP 96738 |
30.54 |
| 2026-05-13 12:00 |
19:41:54.67 |
-14:56:01.9 |
HIP 96738 |
29.59 |
| 2026-05-14 00:00 |
19:41:50.89 |
-14:55:23.1 |
HIP 96738 |
28.58 |
| 2026-05-14 12:00 |
19:41:46.86 |
-14:54:44.8 |
HIP 96738 |
27.53 |
| 2026-05-15 00:00 |
19:41:42.57 |
-14:54:07.2 |
HIP 96738 |
26.42 |
| 2026-05-15 12:00 |
19:41:38.04 |
-14:53:30.3 |
HIP 96738 |
25.26 |
| 2026-05-16 00:00 |
19:41:33.24 |
-14:52:53.9 |
HIP 96738 |
24.06 |
| 2026-05-16 12:00 |
19:41:28.19 |
-14:52:18.2 |
HIP 96738 |
22.80 |
| 2026-05-17 00:00 |
19:41:22.89 |
-14:51:43.1 |
HIP 96738 |
21.49 |
| 2026-05-17 12:00 |
19:41:17.33 |
-14:51:08.7 |
HIP 96738 |
20.13 |
| 2026-05-18 00:00 |
19:41:11.52 |
-14:50:35.0 |
HIP 96738 |
18.73 |
| 2026-05-18 12:00 |
19:41:05.44 |
-14:50:01.9 |
HIP 96738 |
17.29 |
| 2026-05-19 00:00 |
19:40:59.12 |
-14:49:29.4 |
HIP 96738 |
15.80 |
| 2026-05-19 12:00 |
19:40:52.53 |
-14:48:57.6 |
HIP 96738 |
14.28 |
| 2026-05-20 00:00 |
19:40:45.69 |
-14:48:26.5 |
HIP 96738 |
12.74 |
| 2026-05-20 12:00 |
19:40:38.59 |
-14:47:56.1 |
HIP 96738 |
11.19 |
| 2026-05-21 00:00 |
19:40:31.24 |
-14:47:26.3 |
HIP 96738 |
9.66 |
| 2026-05-21 12:00 |
19:40:23.63 |
-14:46:57.2 |
HIP 96738 |
8.20 |
| 2026-05-22 00:00 |
19:40:15.76 |
-14:46:28.8 |
HIP 96738 |
6.91 |
| 2026-05-22 12:00 |
19:40:07.64 |
-14:46:01.0 |
HIP 96738 |
5.94 |
| 2026-05-23 00:00 |
19:39:59.26 |
-14:45:34.0 |
HIP 96738 |
5.54 |
| 2026-05-23 12:00 |
19:39:50.63 |
-14:45:07.6 |
HIP 96738 |
5.89 |
| 2026-05-24 00:00 |
19:39:41.74 |
-14:44:42.0 |
HIP 96738 |
6.93 |
| 2026-05-24 12:00 |
19:39:32.60 |
-14:44:17.0 |
HIP 96738 |
8.45 |
| 2026-05-25 00:00 |
19:39:23.20 |
-14:43:52.7 |
HIP 96738 |
10.28 |
| 2026-05-25 12:00 |
19:39:13.54 |
-14:43:29.1 |
HIP 96738 |
12.31 |
| 2026-05-26 00:00 |
19:39:03.63 |
-14:43:06.2 |
HIP 96738 |
14.49 |
| 2026-05-26 12:00 |
19:38:53.47 |
-14:42:44.1 |
HIP 96557 |
16.06 |
| 2026-05-27 00:00 |
19:38:43.05 |
-14:42:22.6 |
HIP 96557 |
13.69 |
| 2026-05-27 12:00 |
19:38:32.38 |
-14:42:01.8 |
HIP 96557 |
11.34 |
| 2026-05-28 00:00 |
19:38:21.45 |
-14:41:41.8 |
HIP 96557 |
9.06 |
| 2026-05-28 12:00 |
19:38:10.27 |
-14:41:22.5 |
HIP 96557 |
6.99 |
| 2026-05-29 00:00 |
19:37:58.84 |
-14:41:03.8 |
HIP 96557 |
5.49 |
| 2026-05-29 12:00 |
19:37:47.16 |
-14:40:45.9 |
HIP 96557 |
5.18 |
| 2026-05-30 00:00 |
19:37:35.22 |
-14:40:28.7 |
HIP 96557 |
6.32 |
| 2026-05-30 12:00 |
19:37:23.04 |
-14:40:12.3 |
HIP 96557 |
8.39 |
| 2026-05-31 00:00 |
19:37:10.60 |
-14:39:56.5 |
HIP 96557 |
10.92 |
| 2026-05-31 12:00 |
19:36:57.91 |
-14:39:41.5 |
HIP 96557 |
13.70 |
| 2026-06-01 00:00 |
19:36:44.97 |
-14:39:27.2 |
HIP 96506 |
14.97 |
| 2026-06-01 12:00 |
19:36:31.79 |
-14:39:13.6 |
HIP 96506 |
16.39 |
| 2026-06-02 00:00 |
19:36:18.35 |
-14:39:00.8 |
HIP 96506 |
18.31 |