C/2018 W1 (Catalina)
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) |
| 2026-02-03 00:00 |
16:42:41.97 |
+22:26:09.4 |
HIP 81925 |
18.54 |
| 2026-02-03 12:00 |
16:42:45.77 |
+22:27:19.7 |
HIP 81925 |
17.92 |
| 2026-02-04 00:00 |
16:42:49.51 |
+22:28:30.3 |
HIP 81925 |
17.41 |
| 2026-02-04 12:00 |
16:42:53.20 |
+22:29:41.4 |
HIP 81925 |
17.02 |
| 2026-02-05 00:00 |
16:42:56.84 |
+22:30:52.9 |
HIP 81925 |
16.77 |
| 2026-02-05 12:00 |
16:43:00.42 |
+22:32:04.7 |
HIP 81925 |
16.66 |
| 2026-02-06 00:00 |
16:43:03.94 |
+22:33:17.0 |
HIP 81925 |
16.69 |
| 2026-02-06 12:00 |
16:43:07.40 |
+22:34:29.6 |
HIP 81925 |
16.86 |
| 2026-02-07 00:00 |
16:43:10.81 |
+22:35:42.6 |
HIP 81925 |
17.17 |
| 2026-02-07 12:00 |
16:43:14.16 |
+22:36:56.0 |
HIP 81925 |
17.60 |
| 2026-02-08 00:00 |
16:43:17.46 |
+22:38:09.8 |
HIP 81925 |
18.15 |
| 2026-02-08 12:00 |
16:43:20.69 |
+22:39:23.9 |
HIP 81925 |
18.81 |
| 2026-02-09 00:00 |
16:43:23.87 |
+22:40:38.4 |
HIP 81925 |
19.57 |
| 2026-02-09 12:00 |
16:43:26.99 |
+22:41:53.3 |
HIP 81925 |
20.41 |
| 2026-02-10 00:00 |
16:43:30.05 |
+22:43:08.5 |
HIP 81925 |
21.32 |
| 2026-02-10 12:00 |
16:43:33.05 |
+22:44:24.1 |
HIP 81925 |
22.30 |
| 2026-02-11 00:00 |
16:43:35.99 |
+22:45:40.0 |
HIP 81925 |
23.34 |
| 2026-02-11 12:00 |
16:43:38.87 |
+22:46:56.2 |
HIP 81925 |
24.42 |
| 2026-02-12 00:00 |
16:43:41.69 |
+22:48:12.8 |
HIP 81875 |
23.82 |
| 2026-02-12 12:00 |
16:43:44.45 |
+22:49:29.8 |
HIP 81875 |
22.65 |
| 2026-02-13 00:00 |
16:43:47.16 |
+22:50:47.0 |
HIP 81875 |
21.52 |
| 2026-02-13 12:00 |
16:43:49.80 |
+22:52:04.6 |
HIP 81875 |
20.40 |
| 2026-02-14 00:00 |
16:43:52.38 |
+22:53:22.5 |
HIP 81875 |
19.33 |
| 2026-02-14 12:00 |
16:43:54.89 |
+22:54:40.7 |
HIP 81875 |
18.28 |
| 2026-02-15 00:00 |
16:43:57.35 |
+22:55:59.2 |
HIP 81875 |
17.29 |
| 2026-02-15 12:00 |
16:43:59.74 |
+22:57:18.0 |
HIP 81875 |
16.34 |
| 2026-02-16 00:00 |
16:44:02.08 |
+22:58:37.2 |
HIP 81875 |
15.46 |
| 2026-02-16 12:00 |
16:44:04.35 |
+22:59:56.6 |
HIP 81875 |
14.65 |
| 2026-02-17 00:00 |
16:44:06.56 |
+23:01:16.3 |
HIP 81875 |
13.93 |
| 2026-02-17 12:00 |
16:44:08.70 |
+23:02:36.3 |
HIP 81875 |
13.30 |
| 2026-02-18 00:00 |
16:44:10.78 |
+23:03:56.5 |
HIP 81875 |
12.79 |
| 2026-02-18 12:00 |
16:44:12.80 |
+23:05:17.1 |
HIP 81875 |
12.41 |
| 2026-02-19 00:00 |
16:44:14.76 |
+23:06:37.9 |
HIP 81875 |
12.16 |
| 2026-02-19 12:00 |
16:44:16.65 |
+23:07:58.9 |
HIP 81875 |
12.07 |
| 2026-02-20 00:00 |
16:44:18.48 |
+23:09:20.3 |
HIP 81875 |
12.12 |
| 2026-02-20 12:00 |
16:44:20.24 |
+23:10:41.8 |
HIP 81875 |
12.32 |
| 2026-02-21 00:00 |
16:44:21.94 |
+23:12:03.7 |
HIP 81875 |
12.67 |
| 2026-02-21 12:00 |
16:44:23.58 |
+23:13:25.7 |
HIP 81875 |
13.14 |
| 2026-02-22 00:00 |
16:44:25.15 |
+23:14:48.0 |
HIP 81875 |
13.73 |
| 2026-02-22 12:00 |
16:44:26.66 |
+23:16:10.5 |
HIP 81875 |
14.43 |
| 2026-02-23 00:00 |
16:44:28.10 |
+23:17:33.2 |
HIP 81933 |
14.08 |
| 2026-02-23 12:00 |
16:44:29.48 |
+23:18:56.2 |
HIP 81933 |
12.86 |
| 2026-02-24 00:00 |
16:44:30.79 |
+23:20:19.3 |
HIP 81933 |
11.69 |