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 |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
18:32:36.47 |
-16:58:48.8 |
HIP 90939 |
25.93 |
| 2026-09-20 12:00 |
18:32:40.01 |
-16:59:34.1 |
HIP 90939 |
26.49 |
| 2026-09-21 00:00 |
18:32:43.84 |
-17:00:19.1 |
HIP 90939 |
27.06 |
| 2026-09-21 12:00 |
18:32:47.95 |
-17:01:03.7 |
HIP 90939 |
27.66 |
| 2026-09-22 00:00 |
18:32:52.36 |
-17:01:48.1 |
HIP 90939 |
28.29 |
| 2026-09-22 12:00 |
18:32:57.05 |
-17:02:32.2 |
HIP 90939 |
28.95 |
| 2026-09-23 00:00 |
18:33:02.02 |
-17:03:16.0 |
HIP 90939 |
29.65 |
| 2026-09-23 12:00 |
18:33:07.28 |
-17:03:59.4 |
HIP 91112 |
29.24 |
| 2026-09-24 00:00 |
18:33:12.82 |
-17:04:42.5 |
HIP 91112 |
28.06 |
| 2026-09-24 12:00 |
18:33:18.65 |
-17:05:25.3 |
HIP 91112 |
26.86 |
| 2026-09-25 00:00 |
18:33:24.76 |
-17:06:07.8 |
HIP 91112 |
25.62 |
| 2026-09-25 12:00 |
18:33:31.14 |
-17:06:49.9 |
HIP 91112 |
24.37 |
| 2026-09-26 00:00 |
18:33:37.81 |
-17:07:31.7 |
HIP 91112 |
23.11 |
| 2026-09-26 12:00 |
18:33:44.76 |
-17:08:13.2 |
HIP 91112 |
21.85 |
| 2026-09-27 00:00 |
18:33:51.98 |
-17:08:54.3 |
HIP 91112 |
20.60 |
| 2026-09-27 12:00 |
18:33:59.49 |
-17:09:35.0 |
HIP 91112 |
19.40 |
| 2026-09-28 00:00 |
18:34:07.26 |
-17:10:15.4 |
HIP 91112 |
18.27 |
| 2026-09-28 12:00 |
18:34:15.32 |
-17:10:55.5 |
HIP 91112 |
17.23 |
| 2026-09-29 00:00 |
18:34:23.64 |
-17:11:35.2 |
HIP 91112 |
16.34 |
| 2026-09-29 12:00 |
18:34:32.24 |
-17:12:14.5 |
HIP 91112 |
15.63 |
| 2026-09-30 00:00 |
18:34:41.12 |
-17:12:53.4 |
HIP 91112 |
15.17 |
| 2026-09-30 12:00 |
18:34:50.26 |
-17:13:32.0 |
HIP 91112 |
15.00 |
| 2026-10-01 00:00 |
18:34:59.67 |
-17:14:10.2 |
HIP 91112 |
15.17 |
| 2026-10-01 12:00 |
18:35:09.36 |
-17:14:48.0 |
HIP 91112 |
15.67 |
| 2026-10-02 00:00 |
18:35:19.31 |
-17:15:25.4 |
HIP 91112 |
16.52 |
| 2026-10-02 12:00 |
18:35:29.53 |
-17:16:02.4 |
HIP 91246 |
17.65 |
| 2026-10-03 00:00 |
18:35:40.02 |
-17:16:39.1 |
HIP 91246 |
15.36 |
| 2026-10-03 12:00 |
18:35:50.78 |
-17:17:15.3 |
HIP 91246 |
13.12 |
| 2026-10-04 00:00 |
18:36:01.80 |
-17:17:51.1 |
HIP 91246 |
11.00 |
| 2026-10-04 12:00 |
18:36:13.09 |
-17:18:26.5 |
HIP 91246 |
9.14 |
| 2026-10-05 00:00 |
18:36:24.64 |
-17:19:01.5 |
HIP 91246 |
7.79 |
| 2026-10-05 12:00 |
18:36:36.45 |
-17:19:36.0 |
HIP 91246 |
7.31 |
| 2026-10-06 00:00 |
18:36:48.52 |
-17:20:10.2 |
HIP 91246 |
7.92 |
| 2026-10-06 12:00 |
18:37:00.86 |
-17:20:43.8 |
HIP 91246 |
9.48 |
| 2026-10-07 00:00 |
18:37:13.46 |
-17:21:17.1 |
HIP 91246 |
11.65 |
| 2026-10-07 12:00 |
18:37:26.31 |
-17:21:49.9 |
HIP 91343 |
9.98 |
| 2026-10-08 00:00 |
18:37:39.42 |
-17:22:22.2 |
HIP 91343 |
8.97 |
| 2026-10-08 12:00 |
18:37:52.80 |
-17:22:54.1 |
HIP 91343 |
9.03 |
| 2026-10-09 00:00 |
18:38:06.42 |
-17:23:25.6 |
HIP 91343 |
10.19 |
| 2026-10-09 12:00 |
18:38:20.30 |
-17:23:56.5 |
HIP 91343 |
12.18 |
| 2026-10-10 00:00 |
18:38:34.44 |
-17:24:27.0 |
HIP 91343 |
14.71 |
| 2026-10-10 12:00 |
18:38:48.83 |
-17:24:57.0 |
HIP 91343 |
17.59 |
| 2026-10-11 00:00 |
18:39:03.47 |
-17:25:26.5 |
HIP 91343 |
20.69 |