C/1991 Y1 (Zanotta-Brewington)
메타데이터
| 항목 |
값 |
| Designation |
C/1991 Y1 (Zanotta-Brewington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-01-31T23:47:40.372800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
266 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1992-01-10.0000000 |
| e |
1.00005670 |
| q (au) |
0.643969 |
| a (au) |
-11357.972781 |
| i (deg) |
50.028225 |
| Ω (om, deg) |
254.908258 |
| ω (w, deg) |
197.872524 |
| M (ma, deg) |
-0.000018 |
밝기
산란 + 전체 선형
$$
M_a = (9.204 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.204 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
| 1991-12-23 |
1992-01-31 |
+0.0509 |
+0.039 |
| 1992-02-01 |
1992-05-02 |
+12.8239 |
+2.103 |
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 |
17:15:26.86 |
-18:33:25.7 |
HIP 84467 |
11.71 |
| 2026-02-03 12:00 |
17:15:28.15 |
-18:33:24.8 |
HIP 84467 |
11.46 |
| 2026-02-04 00:00 |
17:15:29.43 |
-18:33:23.7 |
HIP 84467 |
11.23 |
| 2026-02-04 12:00 |
17:15:30.70 |
-18:33:22.7 |
HIP 84467 |
11.00 |
| 2026-02-05 00:00 |
17:15:31.95 |
-18:33:21.6 |
HIP 84467 |
10.78 |
| 2026-02-05 12:00 |
17:15:33.18 |
-18:33:20.5 |
HIP 84467 |
10.56 |
| 2026-02-06 00:00 |
17:15:34.40 |
-18:33:19.4 |
HIP 84467 |
10.35 |
| 2026-02-06 12:00 |
17:15:35.61 |
-18:33:18.3 |
HIP 84467 |
10.15 |
| 2026-02-07 00:00 |
17:15:36.79 |
-18:33:17.1 |
HIP 84467 |
9.96 |
| 2026-02-07 12:00 |
17:15:37.97 |
-18:33:15.9 |
HIP 84467 |
9.77 |
| 2026-02-08 00:00 |
17:15:39.12 |
-18:33:14.6 |
HIP 84467 |
9.59 |
| 2026-02-08 12:00 |
17:15:40.26 |
-18:33:13.3 |
HIP 84467 |
9.42 |
| 2026-02-09 00:00 |
17:15:41.39 |
-18:33:12.0 |
HIP 84467 |
9.25 |
| 2026-02-09 12:00 |
17:15:42.50 |
-18:33:10.7 |
HIP 84467 |
9.10 |
| 2026-02-10 00:00 |
17:15:43.59 |
-18:33:09.3 |
HIP 84467 |
8.95 |
| 2026-02-10 12:00 |
17:15:44.67 |
-18:33:07.9 |
HIP 84467 |
8.80 |
| 2026-02-11 00:00 |
17:15:45.73 |
-18:33:06.5 |
HIP 84467 |
8.67 |
| 2026-02-11 12:00 |
17:15:46.77 |
-18:33:05.1 |
HIP 84467 |
8.55 |
| 2026-02-12 00:00 |
17:15:47.80 |
-18:33:03.6 |
HIP 84467 |
8.43 |
| 2026-02-12 12:00 |
17:15:48.81 |
-18:33:02.1 |
HIP 84467 |
8.32 |
| 2026-02-13 00:00 |
17:15:49.81 |
-18:33:00.6 |
HIP 84467 |
8.22 |
| 2026-02-13 12:00 |
17:15:50.79 |
-18:32:59.0 |
HIP 84467 |
8.12 |
| 2026-02-14 00:00 |
17:15:51.75 |
-18:32:57.4 |
HIP 84467 |
8.04 |
| 2026-02-14 12:00 |
17:15:52.69 |
-18:32:55.8 |
HIP 84467 |
7.96 |
| 2026-02-15 00:00 |
17:15:53.62 |
-18:32:54.2 |
HIP 84467 |
7.89 |
| 2026-02-15 12:00 |
17:15:54.53 |
-18:32:52.5 |
HIP 84467 |
7.83 |
| 2026-02-16 00:00 |
17:15:55.42 |
-18:32:50.8 |
HIP 84467 |
7.78 |
| 2026-02-16 12:00 |
17:15:56.30 |
-18:32:49.1 |
HIP 84467 |
7.73 |
| 2026-02-17 00:00 |
17:15:57.16 |
-18:32:47.3 |
HIP 84467 |
7.69 |
| 2026-02-17 12:00 |
17:15:58.00 |
-18:32:45.5 |
HIP 84467 |
7.66 |
| 2026-02-18 00:00 |
17:15:58.83 |
-18:32:43.7 |
HIP 84467 |
7.63 |
| 2026-02-18 12:00 |
17:15:59.63 |
-18:32:41.9 |
HIP 84467 |
7.61 |
| 2026-02-19 00:00 |
17:16:00.42 |
-18:32:40.0 |
HIP 84467 |
7.60 |
| 2026-02-19 12:00 |
17:16:01.19 |
-18:32:38.1 |
HIP 84467 |
7.59 |
| 2026-02-20 00:00 |
17:16:01.95 |
-18:32:36.2 |
HIP 84467 |
7.59 |
| 2026-02-20 12:00 |
17:16:02.68 |
-18:32:34.2 |
HIP 84467 |
7.59 |
| 2026-02-21 00:00 |
17:16:03.40 |
-18:32:32.3 |
HIP 84467 |
7.60 |
| 2026-02-21 12:00 |
17:16:04.10 |
-18:32:30.3 |
HIP 84467 |
7.61 |
| 2026-02-22 00:00 |
17:16:04.79 |
-18:32:28.3 |
HIP 84467 |
7.63 |
| 2026-02-22 12:00 |
17:16:05.45 |
-18:32:26.2 |
HIP 84467 |
7.65 |
| 2026-02-23 00:00 |
17:16:06.10 |
-18:32:24.1 |
HIP 84467 |
7.68 |
| 2026-02-23 12:00 |
17:16:06.73 |
-18:32:22.0 |
HIP 84467 |
7.71 |
| 2026-02-24 00:00 |
17:16:07.34 |
-18:32:19.9 |
HIP 84467 |
7.74 |