메타데이터
| 항목 |
값 |
| Designation |
299P/Catalina-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-04-30T19:01:29.798400Z |
| Orbit solution date (soln_date, UTC) |
2025-09-22T13:42:25Z |
| Obs used |
880 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
16.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-03-20.0000000 |
| e |
0.28157926 |
| q (au) |
3.150195 |
| a (au) |
4.384889 |
| i (deg) |
10.475280 |
| Ω (om, deg) |
271.625782 |
| ω (w, deg) |
323.895115 |
| M (ma, deg) |
237.868045 |
밝기
산란 + 전체 선형
$$
M_a = (7.310 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.310 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
| 2022-02-05 |
2024-04-22 |
+4.3053 |
-1.815 |
| 2024-05-02 |
2025-09-19 |
+24.4776 |
-13.053 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
23:58:49.20 |
+12:51:18.4 |
HIP 118152 |
23.13 |
| 2026-07-29 12:00 |
23:58:44.19 |
+12:52:04.0 |
HIP 118152 |
21.85 |
| 2026-07-30 00:00 |
23:58:38.99 |
+12:52:48.0 |
HIP 118152 |
20.59 |
| 2026-07-30 12:00 |
23:58:33.60 |
+12:53:30.6 |
HIP 118152 |
19.37 |
| 2026-07-31 00:00 |
23:58:28.01 |
+12:54:11.7 |
HIP 118152 |
18.18 |
| 2026-07-31 12:00 |
23:58:22.23 |
+12:54:51.3 |
HIP 118152 |
17.07 |
| 2026-08-01 00:00 |
23:58:16.25 |
+12:55:29.4 |
HIP 118152 |
16.03 |
| 2026-08-01 12:00 |
23:58:10.09 |
+12:56:05.9 |
HIP 118152 |
15.11 |
| 2026-08-02 00:00 |
23:58:03.73 |
+12:56:41.0 |
HIP 118152 |
14.34 |
| 2026-08-02 12:00 |
23:57:57.18 |
+12:57:14.5 |
HIP 118152 |
13.75 |
| 2026-08-03 00:00 |
23:57:50.44 |
+12:57:46.5 |
HIP 118152 |
13.38 |
| 2026-08-03 12:00 |
23:57:43.51 |
+12:58:17.0 |
HIP 118152 |
13.27 |
| 2026-08-04 00:00 |
23:57:36.40 |
+12:58:45.9 |
HIP 118152 |
13.43 |
| 2026-08-04 12:00 |
23:57:29.09 |
+12:59:13.3 |
HIP 118089 |
13.86 |
| 2026-08-05 00:00 |
23:57:21.59 |
+12:59:39.1 |
HIP 118089 |
13.15 |
| 2026-08-05 12:00 |
23:57:13.91 |
+13:00:03.4 |
HIP 118089 |
12.71 |
| 2026-08-06 00:00 |
23:57:06.04 |
+13:00:26.0 |
HIP 118089 |
12.58 |
| 2026-08-06 12:00 |
23:56:57.99 |
+13:00:47.2 |
HIP 118047 |
12.28 |
| 2026-08-07 00:00 |
23:56:49.75 |
+13:01:06.7 |
HIP 118047 |
12.07 |
| 2026-08-07 12:00 |
23:56:41.33 |
+13:01:24.6 |
HIP 118047 |
12.18 |
| 2026-08-08 00:00 |
23:56:32.72 |
+13:01:41.0 |
HIP 118047 |
12.61 |
| 2026-08-08 12:00 |
23:56:23.93 |
+13:01:55.8 |
HIP 118047 |
13.35 |
| 2026-08-09 00:00 |
23:56:14.96 |
+13:02:08.9 |
HIP 118047 |
14.37 |
| 2026-08-09 12:00 |
23:56:05.81 |
+13:02:20.5 |
HIP 118047 |
15.64 |
| 2026-08-10 00:00 |
23:55:56.48 |
+13:02:30.4 |
HIP 118047 |
17.12 |
| 2026-08-10 12:00 |
23:55:46.97 |
+13:02:38.8 |
HIP 117899 |
16.92 |
| 2026-08-11 00:00 |
23:55:37.29 |
+13:02:45.5 |
HIP 117899 |
15.03 |
| 2026-08-11 12:00 |
23:55:27.43 |
+13:02:50.6 |
HIP 117899 |
13.29 |
| 2026-08-12 00:00 |
23:55:17.40 |
+13:02:54.1 |
HIP 117899 |
11.79 |
| 2026-08-12 12:00 |
23:55:07.19 |
+13:02:56.0 |
HIP 117899 |
10.64 |
| 2026-08-13 00:00 |
23:54:56.82 |
+13:02:56.2 |
HIP 117899 |
10.02 |
| 2026-08-13 12:00 |
23:54:46.27 |
+13:02:54.9 |
HIP 117899 |
10.05 |
| 2026-08-14 00:00 |
23:54:35.56 |
+13:02:51.9 |
HIP 117899 |
10.75 |
| 2026-08-14 12:00 |
23:54:24.68 |
+13:02:47.2 |
HIP 117899 |
12.04 |
| 2026-08-15 00:00 |
23:54:13.63 |
+13:02:41.0 |
HIP 117899 |
13.77 |
| 2026-08-15 12:00 |
23:54:02.43 |
+13:02:33.1 |
HIP 117899 |
15.82 |
| 2026-08-16 00:00 |
23:53:51.06 |
+13:02:23.6 |
HIP 117899 |
18.09 |
| 2026-08-16 12:00 |
23:53:39.54 |
+13:02:12.5 |
HIP 117717 |
19.75 |
| 2026-08-17 00:00 |
23:53:27.85 |
+13:01:59.8 |
HIP 117717 |
17.22 |
| 2026-08-17 12:00 |
23:53:16.01 |
+13:01:45.4 |
HIP 117717 |
14.76 |
| 2026-08-18 00:00 |
23:53:04.02 |
+13:01:29.4 |
HIP 117717 |
12.45 |
| 2026-08-18 12:00 |
23:52:51.88 |
+13:01:11.8 |
HIP 117717 |
10.41 |
| 2026-08-19 00:00 |
23:52:39.58 |
+13:00:52.6 |
HIP 117717 |
8.87 |