메타데이터
| 항목 |
값 |
| Designation |
C/2017 S6 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-26T22:22:53.693760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
247 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-11-15.0000000 |
| e |
1.00140730 |
| q (au) |
1.542930 |
| a (au) |
-1096.375698 |
| i (deg) |
152.826812 |
| Ω (om, deg) |
130.873122 |
| ω (w, deg) |
134.685410 |
| M (ma, deg) |
-0.002822 |
밝기
산란 + 전체 선형
$$
M_a = (17.010 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.010 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.676 |
| 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 |
| 2017-02-16 |
2017-10-28 |
+4.8973 |
-2.493 |
| 2017-10-28 |
2018-02-05 |
+7.2164 |
-2.343 |
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 |
12:38:51.75 |
-32:40:03.5 |
HIP 61743 |
6.15 |
| 2026-07-29 12:00 |
12:38:53.90 |
-32:39:38.1 |
HIP 61743 |
6.05 |
| 2026-07-30 00:00 |
12:38:56.08 |
-32:39:13.1 |
HIP 61743 |
6.00 |
| 2026-07-30 12:00 |
12:38:58.31 |
-32:38:48.5 |
HIP 61743 |
6.01 |
| 2026-07-31 00:00 |
12:39:00.58 |
-32:38:24.3 |
HIP 61743 |
6.07 |
| 2026-07-31 12:00 |
12:39:02.88 |
-32:38:00.4 |
HIP 61743 |
6.18 |
| 2026-08-01 00:00 |
12:39:05.23 |
-32:37:36.8 |
HIP 61743 |
6.34 |
| 2026-08-01 12:00 |
12:39:07.62 |
-32:37:13.7 |
HIP 61743 |
6.56 |
| 2026-08-02 00:00 |
12:39:10.05 |
-32:36:50.9 |
HIP 61743 |
6.81 |
| 2026-08-02 12:00 |
12:39:12.52 |
-32:36:28.5 |
HIP 61743 |
7.11 |
| 2026-08-03 00:00 |
12:39:15.03 |
-32:36:06.5 |
HIP 61743 |
7.45 |
| 2026-08-03 12:00 |
12:39:17.58 |
-32:35:44.8 |
HIP 61743 |
7.82 |
| 2026-08-04 00:00 |
12:39:20.17 |
-32:35:23.5 |
HIP 61743 |
8.22 |
| 2026-08-04 12:00 |
12:39:22.80 |
-32:35:02.6 |
HIP 61743 |
8.64 |
| 2026-08-05 00:00 |
12:39:25.47 |
-32:34:42.0 |
HIP 61743 |
9.09 |
| 2026-08-05 12:00 |
12:39:28.18 |
-32:34:21.9 |
HIP 61743 |
9.55 |
| 2026-08-06 00:00 |
12:39:30.92 |
-32:34:02.1 |
HIP 61743 |
10.04 |
| 2026-08-06 12:00 |
12:39:33.71 |
-32:33:42.6 |
HIP 61743 |
10.54 |
| 2026-08-07 00:00 |
12:39:36.53 |
-32:33:23.6 |
HIP 61743 |
11.06 |
| 2026-08-07 12:00 |
12:39:39.39 |
-32:33:04.9 |
HIP 61743 |
11.59 |
| 2026-08-08 00:00 |
12:39:42.28 |
-32:32:46.7 |
HIP 61743 |
12.13 |
| 2026-08-08 12:00 |
12:39:45.22 |
-32:32:28.8 |
HIP 61743 |
12.69 |
| 2026-08-09 00:00 |
12:39:48.19 |
-32:32:11.2 |
HIP 61743 |
13.26 |
| 2026-08-09 12:00 |
12:39:51.20 |
-32:31:54.1 |
HIP 61743 |
13.83 |
| 2026-08-10 00:00 |
12:39:54.25 |
-32:31:37.3 |
HIP 61743 |
14.42 |
| 2026-08-10 12:00 |
12:39:57.33 |
-32:31:21.0 |
HIP 61743 |
15.02 |
| 2026-08-11 00:00 |
12:40:00.45 |
-32:31:05.0 |
HIP 61743 |
15.62 |
| 2026-08-11 12:00 |
12:40:03.60 |
-32:30:49.4 |
HIP 61743 |
16.23 |
| 2026-08-12 00:00 |
12:40:06.79 |
-32:30:34.2 |
HIP 61743 |
16.85 |
| 2026-08-12 12:00 |
12:40:10.02 |
-32:30:19.3 |
HIP 61743 |
17.48 |
| 2026-08-13 00:00 |
12:40:13.28 |
-32:30:04.9 |
HIP 61743 |
18.11 |
| 2026-08-13 12:00 |
12:40:16.58 |
-32:29:50.8 |
HIP 61743 |
18.76 |
| 2026-08-14 00:00 |
12:40:19.91 |
-32:29:37.1 |
HIP 61743 |
19.40 |
| 2026-08-14 12:00 |
12:40:23.27 |
-32:29:23.8 |
HIP 61964 |
19.48 |
| 2026-08-15 00:00 |
12:40:26.67 |
-32:29:10.9 |
HIP 61964 |
18.75 |
| 2026-08-15 12:00 |
12:40:30.10 |
-32:28:58.4 |
HIP 61964 |
18.00 |
| 2026-08-16 00:00 |
12:40:33.57 |
-32:28:46.2 |
HIP 61964 |
17.26 |
| 2026-08-16 12:00 |
12:40:37.07 |
-32:28:34.5 |
HIP 61964 |
16.51 |
| 2026-08-17 00:00 |
12:40:40.60 |
-32:28:23.1 |
HIP 61964 |
15.75 |
| 2026-08-17 12:00 |
12:40:44.16 |
-32:28:12.1 |
HIP 61964 |
14.99 |
| 2026-08-18 00:00 |
12:40:47.76 |
-32:28:01.5 |
HIP 61964 |
14.22 |
| 2026-08-18 12:00 |
12:40:51.38 |
-32:27:51.3 |
HIP 61964 |
13.45 |
| 2026-08-19 00:00 |
12:40:55.04 |
-32:27:41.5 |
HIP 61964 |
12.67 |