메타데이터
| 항목 |
값 |
| Designation |
227P/Catalina-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-03-15T05:19:57.423360Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:26Z |
| Obs used |
1235 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
18.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-03-27.0000000 |
| e |
0.51043355 |
| q (au) |
1.742453 |
| a (au) |
3.559175 |
| i (deg) |
6.512508 |
| Ω (om, deg) |
48.592710 |
| ω (w, deg) |
90.858601 |
| M (ma, deg) |
200.853061 |
밝기
산란 + 전체 선형
$$
M_a = (11.892 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.892 |
| n |
6.000 |
| 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 |
| 2023-10-09 |
2023-12-06 |
+3.9053 |
+0.883 |
| 2023-12-06 |
2024-03-15 |
+40.6801 |
-8.847 |
| 2024-03-15 |
2024-07-23 |
-1.7736 |
-0.021 |
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 |
21:09:12.04 |
-24:37:06.5 |
HIP 104476 |
15.86 |
| 2026-05-12 12:00 |
21:09:17.28 |
-24:37:36.6 |
HIP 104476 |
15.65 |
| 2026-05-13 00:00 |
21:09:22.31 |
-24:38:07.6 |
HIP 104504 |
15.28 |
| 2026-05-13 12:00 |
21:09:27.12 |
-24:38:39.7 |
HIP 104504 |
14.15 |
| 2026-05-14 00:00 |
21:09:31.73 |
-24:39:12.6 |
HIP 104504 |
13.06 |
| 2026-05-14 12:00 |
21:09:36.12 |
-24:39:46.5 |
HIP 104504 |
12.00 |
| 2026-05-15 00:00 |
21:09:40.30 |
-24:40:21.4 |
HIP 104504 |
10.98 |
| 2026-05-15 12:00 |
21:09:44.27 |
-24:40:57.3 |
HIP 104504 |
9.98 |
| 2026-05-16 00:00 |
21:09:48.02 |
-24:41:34.1 |
HIP 104504 |
9.01 |
| 2026-05-16 12:00 |
21:09:51.56 |
-24:42:11.8 |
HIP 104504 |
8.08 |
| 2026-05-17 00:00 |
21:09:54.88 |
-24:42:50.5 |
HIP 104504 |
7.17 |
| 2026-05-17 12:00 |
21:09:57.99 |
-24:43:30.2 |
HIP 104504 |
6.29 |
| 2026-05-18 00:00 |
21:10:00.88 |
-24:44:10.8 |
HIP 104504 |
5.43 |
| 2026-05-18 12:00 |
21:10:03.56 |
-24:44:52.4 |
HIP 104504 |
4.61 |
| 2026-05-19 00:00 |
21:10:06.01 |
-24:45:35.0 |
HIP 104504 |
3.82 |
| 2026-05-19 12:00 |
21:10:08.25 |
-24:46:18.4 |
HIP 104504 |
3.08 |
| 2026-05-20 00:00 |
21:10:10.27 |
-24:47:02.9 |
HIP 104504 |
2.40 |
| 2026-05-20 12:00 |
21:10:12.07 |
-24:47:48.2 |
HIP 104504 |
1.85 |
| 2026-05-21 00:00 |
21:10:13.65 |
-24:48:34.5 |
HIP 104504 |
1.55 |
| 2026-05-21 12:00 |
21:10:15.02 |
-24:49:21.8 |
HIP 104504 |
1.63 |
| 2026-05-22 00:00 |
21:10:16.16 |
-24:50:10.0 |
HIP 104504 |
2.05 |
| 2026-05-22 12:00 |
21:10:17.08 |
-24:50:59.1 |
HIP 104504 |
2.64 |
| 2026-05-23 00:00 |
21:10:17.78 |
-24:51:49.1 |
HIP 104504 |
3.33 |
| 2026-05-23 12:00 |
21:10:18.27 |
-24:52:40.1 |
HIP 104504 |
4.05 |
| 2026-05-24 00:00 |
21:10:18.53 |
-24:53:32.0 |
HIP 104504 |
4.81 |
| 2026-05-24 12:00 |
21:10:18.57 |
-24:54:24.7 |
HIP 104504 |
5.59 |
| 2026-05-25 00:00 |
21:10:18.38 |
-24:55:18.5 |
HIP 104504 |
6.39 |
| 2026-05-25 12:00 |
21:10:17.98 |
-24:56:13.1 |
HIP 104504 |
7.21 |
| 2026-05-26 00:00 |
21:10:17.36 |
-24:57:08.6 |
HIP 104504 |
8.06 |
| 2026-05-26 12:00 |
21:10:16.51 |
-24:58:05.0 |
HIP 104504 |
8.92 |
| 2026-05-27 00:00 |
21:10:15.44 |
-24:59:02.3 |
HIP 104504 |
9.81 |
| 2026-05-27 12:00 |
21:10:14.14 |
-25:00:00.5 |
HIP 104504 |
10.72 |
| 2026-05-28 00:00 |
21:10:12.63 |
-25:00:59.6 |
HIP 104504 |
11.66 |
| 2026-05-28 12:00 |
21:10:10.89 |
-25:01:59.5 |
HIP 104504 |
12.63 |
| 2026-05-29 00:00 |
21:10:08.93 |
-25:03:00.4 |
HIP 104504 |
13.63 |
| 2026-05-29 12:00 |
21:10:06.74 |
-25:04:02.1 |
HIP 104504 |
14.66 |
| 2026-05-30 00:00 |
21:10:04.33 |
-25:05:04.7 |
HIP 104504 |
15.72 |
| 2026-05-30 12:00 |
21:10:01.69 |
-25:06:08.1 |
HIP 104504 |
16.81 |
| 2026-05-31 00:00 |
21:09:58.83 |
-25:07:12.4 |
HIP 104504 |
17.94 |
| 2026-05-31 12:00 |
21:09:55.75 |
-25:08:17.5 |
HIP 104504 |
19.11 |
| 2026-06-01 00:00 |
21:09:52.44 |
-25:09:23.5 |
HIP 104504 |
20.31 |
| 2026-06-01 12:00 |
21:09:48.91 |
-25:10:30.4 |
HIP 104504 |
21.55 |
| 2026-06-02 00:00 |
21:09:45.15 |
-25:11:38.0 |
HIP 104482 |
22.40 |