C/1998 P1 (Williams)
메타데이터
| 항목 |
값 |
| Designation |
C/1998 P1 (Williams) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-17T20:04:26.601600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
403 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1998-12-15.0000000 |
| e |
0.99935941 |
| q (au) |
1.146154 |
| a (au) |
1789.224617 |
| i (deg) |
145.728519 |
| Ω (om, deg) |
156.373092 |
| ω (w, deg) |
294.452932 |
| M (ma, deg) |
0.000757 |
밝기
산란 + 전체 선형
$$
M_a = (6.727 + 4.174\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.727 |
| n |
4.174 |
| gf |
0.891 |
| gb |
-0.729 |
| k |
0.993 |
| δ90 |
1.273 |
| 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 |
| 1998-08-10 |
1998-08-29 |
+48.4077 |
-7.973 |
| 1998-08-29 |
1998-10-04 |
-9.7164 |
+0.414 |
| 1998-11-14 |
1998-12-30 |
-0.7986 |
+0.004 |
| 1998-12-30 |
1999-01-17 |
-4.5488 |
+1.146 |
| 1999-01-17 |
1999-02-09 |
+3.1416 |
-0.885 |
| 1999-02-09 |
1999-03-04 |
+15.9071 |
-5.048 |
| 1999-03-04 |
1999-04-13 |
-6.4456 |
+2.729 |
| 1999-04-13 |
1999-05-18 |
-16.8421 |
+7.088 |
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 |
02:47:00.64 |
+52:02:50.3 |
HIP 12994 |
6.13 |
| 2026-02-03 12:00 |
02:47:00.51 |
+52:02:28.4 |
HIP 12994 |
6.49 |
| 2026-02-04 00:00 |
02:47:00.41 |
+52:02:06.5 |
HIP 12994 |
6.86 |
| 2026-02-04 12:00 |
02:47:00.34 |
+52:01:44.7 |
HIP 12994 |
7.22 |
| 2026-02-05 00:00 |
02:47:00.30 |
+52:01:23.0 |
HIP 12994 |
7.58 |
| 2026-02-05 12:00 |
02:47:00.30 |
+52:01:01.4 |
HIP 12994 |
7.94 |
| 2026-02-06 00:00 |
02:47:00.33 |
+52:00:39.9 |
HIP 12994 |
8.29 |
| 2026-02-06 12:00 |
02:47:00.39 |
+52:00:18.5 |
HIP 12994 |
8.65 |
| 2026-02-07 00:00 |
02:47:00.48 |
+51:59:57.2 |
HIP 12994 |
9.00 |
| 2026-02-07 12:00 |
02:47:00.61 |
+51:59:36.0 |
HIP 12994 |
9.35 |
| 2026-02-08 00:00 |
02:47:00.77 |
+51:59:14.8 |
HIP 12994 |
9.70 |
| 2026-02-08 12:00 |
02:47:00.96 |
+51:58:53.8 |
HIP 12994 |
10.05 |
| 2026-02-09 00:00 |
02:47:01.19 |
+51:58:32.8 |
HIP 12994 |
10.39 |
| 2026-02-09 12:00 |
02:47:01.45 |
+51:58:12.0 |
HIP 12994 |
10.74 |
| 2026-02-10 00:00 |
02:47:01.74 |
+51:57:51.3 |
HIP 12994 |
11.08 |
| 2026-02-10 12:00 |
02:47:02.06 |
+51:57:30.6 |
HIP 12994 |
11.42 |
| 2026-02-11 00:00 |
02:47:02.41 |
+51:57:10.1 |
HIP 12994 |
11.76 |
| 2026-02-11 12:00 |
02:47:02.80 |
+51:56:49.7 |
HIP 12994 |
12.10 |
| 2026-02-12 00:00 |
02:47:03.22 |
+51:56:29.4 |
HIP 12994 |
12.44 |
| 2026-02-12 12:00 |
02:47:03.67 |
+51:56:09.2 |
HIP 12994 |
12.77 |
| 2026-02-13 00:00 |
02:47:04.15 |
+51:55:49.1 |
HIP 12994 |
13.10 |
| 2026-02-13 12:00 |
02:47:04.67 |
+51:55:29.1 |
HIP 12994 |
13.44 |
| 2026-02-14 00:00 |
02:47:05.22 |
+51:55:09.3 |
HIP 12994 |
13.77 |
| 2026-02-14 12:00 |
02:47:05.79 |
+51:54:49.5 |
HIP 12994 |
14.10 |
| 2026-02-15 00:00 |
02:47:06.40 |
+51:54:29.9 |
HIP 12994 |
14.42 |
| 2026-02-15 12:00 |
02:47:07.05 |
+51:54:10.4 |
HIP 12994 |
14.75 |
| 2026-02-16 00:00 |
02:47:07.72 |
+51:53:51.0 |
HIP 12994 |
15.07 |
| 2026-02-16 12:00 |
02:47:08.43 |
+51:53:31.7 |
HIP 12994 |
15.40 |
| 2026-02-17 00:00 |
02:47:09.16 |
+51:53:12.6 |
HIP 12994 |
15.72 |
| 2026-02-17 12:00 |
02:47:09.93 |
+51:52:53.6 |
HIP 12994 |
16.04 |
| 2026-02-18 00:00 |
02:47:10.73 |
+51:52:34.7 |
HIP 12994 |
16.36 |
| 2026-02-18 12:00 |
02:47:11.56 |
+51:52:15.9 |
HIP 12994 |
16.68 |
| 2026-02-19 00:00 |
02:47:12.42 |
+51:51:57.3 |
HIP 12994 |
17.00 |
| 2026-02-19 12:00 |
02:47:13.31 |
+51:51:38.8 |
HIP 12994 |
17.32 |
| 2026-02-20 00:00 |
02:47:14.24 |
+51:51:20.4 |
HIP 12994 |
17.63 |
| 2026-02-20 12:00 |
02:47:15.19 |
+51:51:02.1 |
HIP 12994 |
17.95 |
| 2026-02-21 00:00 |
02:47:16.17 |
+51:50:44.0 |
HIP 12994 |
18.26 |
| 2026-02-21 12:00 |
02:47:17.19 |
+51:50:26.1 |
HIP 12994 |
18.57 |
| 2026-02-22 00:00 |
02:47:18.23 |
+51:50:08.2 |
HIP 13076 |
18.40 |
| 2026-02-22 12:00 |
02:47:19.31 |
+51:49:50.5 |
HIP 13076 |
18.06 |
| 2026-02-23 00:00 |
02:47:20.41 |
+51:49:32.9 |
HIP 13076 |
17.73 |
| 2026-02-23 12:00 |
02:47:21.54 |
+51:49:15.5 |
HIP 13076 |
17.39 |
| 2026-02-24 00:00 |
02:47:22.71 |
+51:48:58.2 |
HIP 13076 |
17.06 |