메타데이터
| 항목 |
값 |
| Designation |
C/1999 J2 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-04-05T23:39:38.044800Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:22Z |
| Obs used |
978 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
7.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-04-28.0000000 |
| e |
1.00112158 |
| q (au) |
7.109764 |
| a (au) |
-6339.047335 |
| i (deg) |
86.412859 |
| Ω (om, deg) |
50.042373 |
| ω (w, deg) |
127.138683 |
| M (ma, deg) |
0.000043 |
밝기
산란 + 전체 선형
$$
M_a = (-2.294 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-2.294 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2000-04-06 |
2002-03-22 |
+20.3121 |
-17.666 |
| 2002-03-22 |
2003-05-29 |
+4.9690 |
-3.057 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:48:53.08 |
-76:42:01.8 |
HIP 32548 |
10.26 |
| 2026-03-26 12:00 |
06:48:50.90 |
-76:41:19.4 |
HIP 32548 |
10.83 |
| 2026-03-27 00:00 |
06:48:48.82 |
-76:40:37.0 |
HIP 32548 |
11.43 |
| 2026-03-27 12:00 |
06:48:46.84 |
-76:39:54.6 |
HIP 32548 |
12.04 |
| 2026-03-28 00:00 |
06:48:44.97 |
-76:39:12.1 |
HIP 32548 |
12.66 |
| 2026-03-28 12:00 |
06:48:43.21 |
-76:38:29.6 |
HIP 32548 |
13.30 |
| 2026-03-29 00:00 |
06:48:41.55 |
-76:37:47.0 |
HIP 32548 |
13.94 |
| 2026-03-29 12:00 |
06:48:39.99 |
-76:37:04.5 |
HIP 32548 |
14.60 |
| 2026-03-30 00:00 |
06:48:38.54 |
-76:36:21.9 |
HIP 32548 |
15.26 |
| 2026-03-30 12:00 |
06:48:37.19 |
-76:35:39.3 |
HIP 32548 |
15.92 |
| 2026-03-31 00:00 |
06:48:35.94 |
-76:34:56.7 |
HIP 32548 |
16.60 |
| 2026-03-31 12:00 |
06:48:34.80 |
-76:34:14.0 |
HIP 32548 |
17.28 |
| 2026-04-01 00:00 |
06:48:33.75 |
-76:33:31.4 |
HIP 32548 |
17.96 |
| 2026-04-01 12:00 |
06:48:32.81 |
-76:32:48.8 |
HIP 32548 |
18.64 |
| 2026-04-02 00:00 |
06:48:31.98 |
-76:32:06.1 |
HIP 32548 |
19.33 |
| 2026-04-02 12:00 |
06:48:31.24 |
-76:31:23.5 |
HIP 32548 |
20.02 |
| 2026-04-03 00:00 |
06:48:30.61 |
-76:30:40.8 |
HIP 32548 |
20.72 |
| 2026-04-03 12:00 |
06:48:30.07 |
-76:29:58.2 |
HIP 32548 |
21.41 |
| 2026-04-04 00:00 |
06:48:29.64 |
-76:29:15.6 |
HIP 32548 |
22.11 |
| 2026-04-04 12:00 |
06:48:29.30 |
-76:28:32.9 |
HIP 32548 |
22.81 |
| 2026-04-05 00:00 |
06:48:29.07 |
-76:27:50.3 |
HIP 32548 |
23.51 |
| 2026-04-05 12:00 |
06:48:28.94 |
-76:27:07.8 |
HIP 32548 |
24.21 |
| 2026-04-06 00:00 |
06:48:28.90 |
-76:26:25.2 |
HIP 32548 |
24.91 |
| 2026-04-06 12:00 |
06:48:28.97 |
-76:25:42.6 |
HIP 32548 |
25.61 |
| 2026-04-07 00:00 |
06:48:29.13 |
-76:25:00.1 |
HIP 32548 |
26.32 |
| 2026-04-07 12:00 |
06:48:29.40 |
-76:24:17.6 |
HIP 32548 |
27.02 |
| 2026-04-08 00:00 |
06:48:29.76 |
-76:23:35.2 |
HIP 32548 |
27.73 |
| 2026-04-08 12:00 |
06:48:30.22 |
-76:22:52.8 |
HIP 32548 |
28.43 |
| 2026-04-09 00:00 |
06:48:30.77 |
-76:22:10.4 |
HIP 32548 |
29.14 |
| 2026-04-09 12:00 |
06:48:31.43 |
-76:21:28.0 |
HIP 32548 |
29.84 |
| 2026-04-10 00:00 |
06:48:32.18 |
-76:20:45.7 |
HIP 32548 |
30.55 |
| 2026-04-10 12:00 |
06:48:33.02 |
-76:20:03.5 |
HIP 32548 |
31.25 |
| 2026-04-11 00:00 |
06:48:33.96 |
-76:19:21.3 |
HIP 32548 |
31.96 |
| 2026-04-11 12:00 |
06:48:35.00 |
-76:18:39.1 |
HIP 32548 |
32.66 |
| 2026-04-12 00:00 |
06:48:36.14 |
-76:17:57.0 |
HIP 32548 |
33.37 |
| 2026-04-12 12:00 |
06:48:37.36 |
-76:17:15.0 |
HIP 32548 |
34.07 |
| 2026-04-13 00:00 |
06:48:38.69 |
-76:16:33.0 |
HIP 32828 |
34.08 |
| 2026-04-13 12:00 |
06:48:40.11 |
-76:15:51.1 |
HIP 32828 |
33.38 |
| 2026-04-14 00:00 |
06:48:41.62 |
-76:15:09.3 |
HIP 32828 |
32.68 |
| 2026-04-14 12:00 |
06:48:43.22 |
-76:14:27.5 |
HIP 32828 |
31.98 |
| 2026-04-15 00:00 |
06:48:44.92 |
-76:13:45.8 |
HIP 32828 |
31.28 |
| 2026-04-15 12:00 |
06:48:46.71 |
-76:13:04.1 |
HIP 32828 |
30.58 |
| 2026-04-16 00:00 |
06:48:48.59 |
-76:12:22.6 |
HIP 32828 |
29.88 |