메타데이터
| 항목 |
값 |
| Designation |
395P/Catalina-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-30T11:54:17.147520Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:01:13Z |
| Obs used |
810 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-31.0000000 |
| e |
0.38213832 |
| q (au) |
4.064893 |
| a (au) |
6.578970 |
| i (deg) |
3.276962 |
| Ω (om, deg) |
223.549119 |
| ω (w, deg) |
89.966129 |
| M (ma, deg) |
5.286093 |
밝기
산란 + 전체 선형
$$
M_a = (8.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.762 |
| k |
0.800 |
| 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 |
| 2020-04-26 |
2021-11-28 |
+16.3019 |
-9.562 |
| 2022-06-06 |
2023-10-18 |
+22.4213 |
-14.528 |
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 |
06:13:08.36 |
+20:59:45.0 |
HIP 29492 |
16.25 |
| 2026-07-29 12:00 |
06:13:24.46 |
+20:59:32.7 |
HIP 29492 |
17.65 |
| 2026-07-30 00:00 |
06:13:40.50 |
+20:59:20.4 |
HIP 29492 |
19.67 |
| 2026-07-30 12:00 |
06:13:56.49 |
+20:59:07.9 |
HIP 29492 |
22.14 |
| 2026-07-31 00:00 |
06:14:12.42 |
+20:58:55.2 |
HIP 29744 |
24.54 |
| 2026-07-31 12:00 |
06:14:28.30 |
+20:58:42.4 |
HIP 29744 |
21.10 |
| 2026-08-01 00:00 |
06:14:44.12 |
+20:58:29.5 |
HIP 29744 |
17.78 |
| 2026-08-01 12:00 |
06:14:59.89 |
+20:58:16.5 |
HIP 29744 |
14.66 |
| 2026-08-02 00:00 |
06:15:15.60 |
+20:58:03.3 |
HIP 29744 |
11.88 |
| 2026-08-02 12:00 |
06:15:31.26 |
+20:57:50.0 |
HIP 29744 |
9.72 |
| 2026-08-03 00:00 |
06:15:46.85 |
+20:57:36.5 |
HIP 29744 |
8.64 |
| 2026-08-03 12:00 |
06:16:02.39 |
+20:57:22.9 |
HIP 29744 |
9.02 |
| 2026-08-04 00:00 |
06:16:17.87 |
+20:57:09.2 |
HIP 29744 |
10.69 |
| 2026-08-04 12:00 |
06:16:33.29 |
+20:56:55.4 |
HIP 29744 |
13.16 |
| 2026-08-05 00:00 |
06:16:48.64 |
+20:56:41.4 |
HIP 29744 |
16.06 |
| 2026-08-05 12:00 |
06:17:03.94 |
+20:56:27.3 |
HIP 29744 |
19.18 |
| 2026-08-06 00:00 |
06:17:19.17 |
+20:56:13.1 |
HIP 29744 |
22.43 |
| 2026-08-06 12:00 |
06:17:34.35 |
+20:55:58.8 |
HIP 29981 |
21.34 |
| 2026-08-07 00:00 |
06:17:49.46 |
+20:55:44.3 |
HIP 29981 |
19.16 |
| 2026-08-07 12:00 |
06:18:04.50 |
+20:55:29.8 |
HIP 29981 |
17.44 |
| 2026-08-08 00:00 |
06:18:19.48 |
+20:55:15.1 |
HIP 29981 |
16.31 |
| 2026-08-08 12:00 |
06:18:34.40 |
+20:55:00.3 |
HIP 29981 |
15.89 |
| 2026-08-09 00:00 |
06:18:49.25 |
+20:54:45.3 |
HIP 29981 |
16.23 |
| 2026-08-09 12:00 |
06:19:04.03 |
+20:54:30.3 |
HIP 29981 |
17.27 |
| 2026-08-10 00:00 |
06:19:18.75 |
+20:54:15.1 |
HIP 29981 |
18.89 |
| 2026-08-10 12:00 |
06:19:33.40 |
+20:53:59.9 |
HIP 30041 |
19.59 |
| 2026-08-11 00:00 |
06:19:47.98 |
+20:53:44.5 |
HIP 30041 |
20.29 |
| 2026-08-11 12:00 |
06:20:02.49 |
+20:53:29.0 |
HIP 30041 |
21.52 |
| 2026-08-12 00:00 |
06:20:16.93 |
+20:53:13.5 |
HIP 30202 |
19.93 |
| 2026-08-12 12:00 |
06:20:31.30 |
+20:52:57.8 |
HIP 30202 |
18.06 |
| 2026-08-13 00:00 |
06:20:45.60 |
+20:52:42.0 |
HIP 30202 |
16.67 |
| 2026-08-13 12:00 |
06:20:59.82 |
+20:52:26.1 |
HIP 30202 |
15.88 |
| 2026-08-14 00:00 |
06:21:13.98 |
+20:52:10.1 |
HIP 30202 |
15.78 |
| 2026-08-14 12:00 |
06:21:28.06 |
+20:51:54.0 |
HIP 30202 |
16.36 |
| 2026-08-15 00:00 |
06:21:42.06 |
+20:51:37.9 |
HIP 30202 |
17.54 |
| 2026-08-15 12:00 |
06:21:55.99 |
+20:51:21.6 |
HIP 30202 |
19.21 |
| 2026-08-16 00:00 |
06:22:09.85 |
+20:51:05.3 |
HIP 30202 |
21.24 |
| 2026-08-16 12:00 |
06:22:23.63 |
+20:50:48.8 |
HIP 30202 |
23.54 |
| 2026-08-17 00:00 |
06:22:37.33 |
+20:50:32.3 |
HIP 30202 |
26.02 |
| 2026-08-17 12:00 |
06:22:50.95 |
+20:50:15.7 |
HIP 30487 |
24.49 |
| 2026-08-18 00:00 |
06:23:04.50 |
+20:49:59.0 |
HIP 30487 |
21.60 |
| 2026-08-18 12:00 |
06:23:17.97 |
+20:49:42.2 |
HIP 30487 |
18.81 |
| 2026-08-19 00:00 |
06:23:31.36 |
+20:49:25.3 |
HIP 30487 |
16.18 |