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) |
| 2026-03-26 00:00 |
23:36:39.88 |
+22:17:51.3 |
HIP 116564 |
9.63 |
| 2026-03-26 12:00 |
23:37:25.99 |
+22:22:08.7 |
HIP 116565 |
7.31 |
| 2026-03-27 00:00 |
23:38:12.15 |
+22:26:26.8 |
HIP 116565 |
12.17 |
| 2026-03-27 12:00 |
23:38:58.37 |
+22:30:45.6 |
HIP 116701 |
2.39 |
| 2026-03-28 00:00 |
23:39:44.64 |
+22:35:05.1 |
HIP 116701 |
11.04 |
| 2026-03-28 12:00 |
23:40:30.97 |
+22:39:25.3 |
HIP 116701 |
22.46 |
| 2026-03-29 00:00 |
23:41:17.35 |
+22:43:46.1 |
HIP 116701 |
33.96 |
| 2026-03-29 12:00 |
23:42:03.79 |
+22:48:07.7 |
HIP 117023 |
25.66 |
| 2026-03-30 00:00 |
23:42:50.29 |
+22:52:29.8 |
HIP 117023 |
15.60 |
| 2026-03-30 12:00 |
23:43:36.84 |
+22:56:52.7 |
HIP 117023 |
9.77 |
| 2026-03-31 00:00 |
23:44:23.44 |
+23:01:16.2 |
HIP 117023 |
14.69 |
| 2026-03-31 12:00 |
23:45:10.11 |
+23:05:40.3 |
HIP 117023 |
24.59 |
| 2026-04-01 00:00 |
23:45:56.82 |
+23:10:05.1 |
HIP 117244 |
17.99 |
| 2026-04-01 12:00 |
23:46:43.60 |
+23:14:30.5 |
HIP 117244 |
13.32 |
| 2026-04-02 00:00 |
23:47:30.43 |
+23:18:56.5 |
HIP 117244 |
17.35 |
| 2026-04-02 12:00 |
23:48:17.32 |
+23:23:23.1 |
HIP 117244 |
26.37 |
| 2026-04-03 00:00 |
23:49:04.26 |
+23:27:50.4 |
HIP 117484 |
24.94 |
| 2026-04-03 12:00 |
23:49:51.26 |
+23:32:18.2 |
HIP 117534 |
16.11 |
| 2026-04-04 00:00 |
23:50:38.32 |
+23:36:46.7 |
HIP 117534 |
12.76 |
| 2026-04-04 12:00 |
23:51:25.43 |
+23:41:15.7 |
HIP 117534 |
18.40 |
| 2026-04-05 00:00 |
23:52:12.60 |
+23:45:45.3 |
HIP 117534 |
28.05 |
| 2026-04-05 12:00 |
23:52:59.82 |
+23:50:15.5 |
HIP 117848 |
25.12 |
| 2026-04-06 00:00 |
23:53:47.11 |
+23:54:46.2 |
HIP 117848 |
25.02 |
| 2026-04-06 12:00 |
23:54:34.45 |
+23:59:17.5 |
HIP 117848 |
29.94 |
| 2026-04-07 00:00 |
23:55:21.84 |
+24:03:49.4 |
HIP 117993 |
27.20 |
| 2026-04-07 12:00 |
23:56:09.29 |
+24:08:21.8 |
HIP 117993 |
21.24 |
| 2026-04-08 00:00 |
23:56:56.80 |
+24:12:54.8 |
HIP 117993 |
20.90 |
| 2026-04-08 12:00 |
23:57:44.37 |
+24:17:28.2 |
HIP 118193 |
11.75 |
| 2026-04-09 00:00 |
23:58:31.99 |
+24:22:02.3 |
HIP 118193 |
1.92 |
| 2026-04-09 12:00 |
23:59:19.67 |
+24:26:36.8 |
HIP 118193 |
12.10 |
| 2026-04-10 00:00 |
00:00:07.41 |
+24:31:11.8 |
HIP 118193 |
23.81 |
| 2026-04-10 12:00 |
00:00:55.20 |
+24:35:47.4 |
HIP 136 |
23.28 |
| 2026-04-11 00:00 |
00:01:43.05 |
+24:40:23.4 |
HIP 136 |
25.20 |
| 2026-04-11 12:00 |
00:02:30.96 |
+24:45:00.0 |
HIP 136 |
31.75 |
| 2026-04-12 00:00 |
00:03:18.92 |
+24:49:36.9 |
HIP 504 |
37.65 |
| 2026-04-12 12:00 |
00:04:06.94 |
+24:54:14.4 |
HIP 504 |
26.37 |
| 2026-04-13 00:00 |
00:04:55.01 |
+24:58:52.4 |
HIP 504 |
15.94 |
| 2026-04-13 12:00 |
00:05:43.14 |
+25:03:30.8 |
HIP 504 |
9.65 |
| 2026-04-14 00:00 |
00:06:31.33 |
+25:08:09.6 |
HIP 504 |
14.62 |
| 2026-04-14 12:00 |
00:07:19.57 |
+25:12:48.9 |
HIP 504 |
24.83 |
| 2026-04-15 00:00 |
00:08:07.87 |
+25:17:28.7 |
HIP 716 |
14.34 |
| 2026-04-15 12:00 |
00:08:56.23 |
+25:22:08.8 |
HIP 716 |
5.70 |
| 2026-04-16 00:00 |
00:09:44.64 |
+25:26:49.4 |
HIP 835 |
8.00 |