메타데이터
| 항목 |
값 |
| Designation |
P/2009 Y2 (Kowalski) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-03-30T16:39:00.302400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:38Z |
| Obs used |
178 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
28.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-01-11.0000000 |
| e |
0.64052556 |
| q (au) |
2.339193 |
| a (au) |
6.507258 |
| i (deg) |
29.929609 |
| Ω (om, deg) |
262.126517 |
| ω (w, deg) |
171.961934 |
| M (ma, deg) |
355.327521 |
밝기
산란 + 전체 선형
$$
M_a = (10.523 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.523 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
00:52:57.57 |
+29:35:46.6 |
HIP 4197 |
10.70 |
| 2026-05-12 12:00 |
00:53:48.92 |
+29:40:36.7 |
HIP 4197 |
11.54 |
| 2026-05-13 00:00 |
00:54:40.31 |
+29:45:26.7 |
HIP 4378 |
18.43 |
| 2026-05-13 12:00 |
00:55:31.77 |
+29:50:16.6 |
HIP 4378 |
8.00 |
| 2026-05-14 00:00 |
00:56:23.28 |
+29:55:06.5 |
HIP 4378 |
9.20 |
| 2026-05-14 12:00 |
00:57:14.84 |
+29:59:56.3 |
HIP 4402 |
19.02 |
| 2026-05-15 00:00 |
00:58:06.46 |
+30:04:46.1 |
HIP 4531 |
14.13 |
| 2026-05-15 12:00 |
00:58:58.14 |
+30:09:35.7 |
HIP 4531 |
15.36 |
| 2026-05-16 00:00 |
00:59:49.86 |
+30:14:25.3 |
HIP 4531 |
23.84 |
| 2026-05-16 12:00 |
01:00:41.65 |
+30:19:14.7 |
HIP 4779 |
21.07 |
| 2026-05-17 00:00 |
01:01:33.48 |
+30:24:04.0 |
HIP 4779 |
14.40 |
| 2026-05-17 12:00 |
01:02:25.37 |
+30:28:53.2 |
HIP 4779 |
16.32 |
| 2026-05-18 00:00 |
01:03:17.32 |
+30:33:42.2 |
HIP 4779 |
24.94 |
| 2026-05-18 12:00 |
01:04:09.31 |
+30:38:31.1 |
HIP 4975 |
32.67 |
| 2026-05-19 00:00 |
01:05:01.36 |
+30:43:19.8 |
HIP 4975 |
32.04 |
| 2026-05-19 12:00 |
01:05:53.46 |
+30:48:08.3 |
HIP 4975 |
35.79 |
| 2026-05-20 00:00 |
01:06:45.62 |
+30:52:56.7 |
HIP 5343 |
33.76 |
| 2026-05-20 12:00 |
01:07:37.83 |
+30:57:44.8 |
HIP 5470 |
31.04 |
| 2026-05-21 00:00 |
01:08:30.08 |
+31:02:32.8 |
HIP 5470 |
20.27 |
| 2026-05-21 12:00 |
01:09:22.40 |
+31:07:20.5 |
HIP 5470 |
12.48 |
| 2026-05-22 00:00 |
01:10:14.76 |
+31:12:08.0 |
HIP 5470 |
14.06 |
| 2026-05-22 12:00 |
01:11:07.18 |
+31:16:55.3 |
HIP 5544 |
8.56 |
| 2026-05-23 00:00 |
01:11:59.64 |
+31:21:42.3 |
HIP 5544 |
11.90 |
| 2026-05-23 12:00 |
01:12:52.16 |
+31:26:29.1 |
HIP 5544 |
22.50 |
| 2026-05-24 00:00 |
01:13:44.74 |
+31:31:15.6 |
HIP 5883 |
22.96 |
| 2026-05-24 12:00 |
01:14:37.36 |
+31:36:01.8 |
HIP 5883 |
12.60 |
| 2026-05-25 00:00 |
01:15:30.04 |
+31:40:47.8 |
HIP 5883 |
9.37 |
| 2026-05-25 12:00 |
01:16:22.77 |
+31:45:33.5 |
HIP 5989 |
8.22 |
| 2026-05-26 00:00 |
01:17:15.55 |
+31:50:18.9 |
HIP 6025 |
5.93 |
| 2026-05-26 12:00 |
01:18:08.38 |
+31:55:03.9 |
HIP 6025 |
14.01 |
| 2026-05-27 00:00 |
01:19:01.27 |
+31:59:48.7 |
HIP 6209 |
19.33 |
| 2026-05-27 12:00 |
01:19:54.21 |
+32:04:33.1 |
HIP 6209 |
13.70 |
| 2026-05-28 00:00 |
01:20:47.20 |
+32:09:17.2 |
HIP 6209 |
17.26 |
| 2026-05-28 12:00 |
01:21:40.24 |
+32:14:01.0 |
HIP 6362 |
24.37 |
| 2026-05-29 00:00 |
01:22:33.34 |
+32:18:44.4 |
HIP 6362 |
22.24 |
| 2026-05-29 12:00 |
01:23:26.48 |
+32:23:27.5 |
HIP 6362 |
26.28 |
| 2026-05-30 00:00 |
01:24:19.68 |
+32:28:10.2 |
HIP 6594 |
33.69 |
| 2026-05-30 12:00 |
01:25:12.94 |
+32:32:52.5 |
HIP 6594 |
29.43 |
| 2026-05-31 00:00 |
01:26:06.24 |
+32:37:34.4 |
HIP 6594 |
29.86 |
| 2026-05-31 12:00 |
01:26:59.59 |
+32:42:16.0 |
HIP 6594 |
34.83 |
| 2026-06-01 00:00 |
01:27:53.00 |
+32:46:57.2 |
HIP 7012 |
36.71 |
| 2026-06-01 12:00 |
01:28:46.46 |
+32:51:37.9 |
HIP 7012 |
24.94 |
| 2026-06-02 00:00 |
01:29:39.97 |
+32:56:18.3 |
HIP 7012 |
13.85 |