메타데이터
| 항목 |
값 |
| Designation |
C/2018 W1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-05-11T20:28:13.800000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-11-16T04:47:27.168000Z |
| Discovery magnitude (MPC) |
19.80 G |
| Discovery observatory (MPC) |
703 · Catalina Sky Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-01-26.0000000 |
| e |
0.93766329 |
| q (au) |
1.360177 |
| a (au) |
21.819838 |
| i (deg) |
83.278879 |
| Ω (om, deg) |
233.589579 |
| ω (w, deg) |
251.248066 |
| M (ma, deg) |
358.976401 |
밝기
산란 + 전체 선형
$$
M_a = (11.588 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.588 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.941 |
| k |
0.999 |
| 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 |
| 2018-11-16 |
2019-03-08 |
-1.4661 |
+0.573 |
| 2019-05-26 |
2020-05-21 |
+6.2919 |
-4.653 |
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 |
16:35:39.57 |
+26:34:25.7 |
HIP 81243 |
6.11 |
| 2026-05-12 12:00 |
16:35:32.47 |
+26:35:10.7 |
HIP 81243 |
6.72 |
| 2026-05-13 00:00 |
16:35:25.34 |
+26:35:55.1 |
HIP 81243 |
7.69 |
| 2026-05-13 12:00 |
16:35:18.20 |
+26:36:38.8 |
HIP 81243 |
8.89 |
| 2026-05-14 00:00 |
16:35:11.03 |
+26:37:21.9 |
HIP 81243 |
10.25 |
| 2026-05-14 12:00 |
16:35:03.84 |
+26:38:04.3 |
HIP 81243 |
11.70 |
| 2026-05-15 00:00 |
16:34:56.64 |
+26:38:46.1 |
HIP 81243 |
13.23 |
| 2026-05-15 12:00 |
16:34:49.41 |
+26:39:27.2 |
HIP 81243 |
14.80 |
| 2026-05-16 00:00 |
16:34:42.16 |
+26:40:07.7 |
HIP 81243 |
16.40 |
| 2026-05-16 12:00 |
16:34:34.90 |
+26:40:47.4 |
HIP 81243 |
18.02 |
| 2026-05-17 00:00 |
16:34:27.62 |
+26:41:26.6 |
HIP 81243 |
19.67 |
| 2026-05-17 12:00 |
16:34:20.32 |
+26:42:05.0 |
HIP 81243 |
21.32 |
| 2026-05-18 00:00 |
16:34:13.00 |
+26:42:42.8 |
HIP 81019 |
21.96 |
| 2026-05-18 12:00 |
16:34:05.67 |
+26:43:19.9 |
HIP 81019 |
20.23 |
| 2026-05-19 00:00 |
16:33:58.33 |
+26:43:56.4 |
HIP 81019 |
18.50 |
| 2026-05-19 12:00 |
16:33:50.97 |
+26:44:32.1 |
HIP 81019 |
16.78 |
| 2026-05-20 00:00 |
16:33:43.60 |
+26:45:07.2 |
HIP 81019 |
15.07 |
| 2026-05-20 12:00 |
16:33:36.22 |
+26:45:41.6 |
HIP 81019 |
13.37 |
| 2026-05-21 00:00 |
16:33:28.82 |
+26:46:15.3 |
HIP 81019 |
11.68 |
| 2026-05-21 12:00 |
16:33:21.42 |
+26:46:48.4 |
HIP 81019 |
10.03 |
| 2026-05-22 00:00 |
16:33:14.00 |
+26:47:20.7 |
HIP 81019 |
8.41 |
| 2026-05-22 12:00 |
16:33:06.57 |
+26:47:52.4 |
HIP 81019 |
6.87 |
| 2026-05-23 00:00 |
16:32:59.14 |
+26:48:23.4 |
HIP 81019 |
5.44 |
| 2026-05-23 12:00 |
16:32:51.69 |
+26:48:53.7 |
HIP 81019 |
4.27 |
| 2026-05-24 00:00 |
16:32:44.24 |
+26:49:23.3 |
HIP 81019 |
3.61 |
| 2026-05-24 12:00 |
16:32:36.78 |
+26:49:52.2 |
HIP 81019 |
3.72 |
| 2026-05-25 00:00 |
16:32:29.32 |
+26:50:20.4 |
HIP 81019 |
4.56 |
| 2026-05-25 12:00 |
16:32:21.84 |
+26:50:47.9 |
HIP 81019 |
5.81 |
| 2026-05-26 00:00 |
16:32:14.37 |
+26:51:14.8 |
HIP 81019 |
7.26 |
| 2026-05-26 12:00 |
16:32:06.89 |
+26:51:40.9 |
HIP 81019 |
8.81 |
| 2026-05-27 00:00 |
16:31:59.40 |
+26:52:06.3 |
HIP 81019 |
10.42 |
| 2026-05-27 12:00 |
16:31:51.92 |
+26:52:31.1 |
HIP 81019 |
12.06 |
| 2026-05-28 00:00 |
16:31:44.43 |
+26:52:55.2 |
HIP 81019 |
13.73 |
| 2026-05-28 12:00 |
16:31:36.93 |
+26:53:18.5 |
HIP 81019 |
15.40 |
| 2026-05-29 00:00 |
16:31:29.44 |
+26:53:41.2 |
HIP 81019 |
17.08 |
| 2026-05-29 12:00 |
16:31:21.95 |
+26:54:03.1 |
HIP 81019 |
18.77 |
| 2026-05-30 00:00 |
16:31:14.45 |
+26:54:24.4 |
HIP 81019 |
20.46 |
| 2026-05-30 12:00 |
16:31:06.96 |
+26:54:45.0 |
HIP 81019 |
22.15 |
| 2026-05-31 00:00 |
16:30:59.46 |
+26:55:04.9 |
HIP 81019 |
23.84 |
| 2026-05-31 12:00 |
16:30:51.97 |
+26:55:24.0 |
HIP 80876 |
23.47 |
| 2026-06-01 00:00 |
16:30:44.49 |
+26:55:42.5 |
HIP 80876 |
23.18 |
| 2026-06-01 12:00 |
16:30:37.00 |
+26:56:00.3 |
HIP 80876 |
23.03 |
| 2026-06-02 00:00 |
16:30:29.52 |
+26:56:17.3 |
HIP 80876 |
23.01 |