메타데이터
| 항목 |
값 |
| Designation |
C/1999 XS87 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-08-06T14:30:32.385600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-01-09.0000000 |
| e |
0.84057497 |
| q (au) |
2.771840 |
| a (au) |
17.386476 |
| i (deg) |
14.846408 |
| Ω (om, deg) |
266.729359 |
| ω (w, deg) |
151.354533 |
| M (ma, deg) |
2.112638 |
밝기
산란 + 전체 선형
$$
M_a = (10.066 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.066 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.759 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
14:59:00.83 |
-26:05:22.5 |
HIP 73339 |
3.89 |
| 2026-07-29 12:00 |
14:59:00.37 |
-26:05:10.7 |
HIP 73339 |
4.10 |
| 2026-07-30 00:00 |
14:58:59.94 |
-26:04:59.1 |
HIP 73339 |
4.30 |
| 2026-07-30 12:00 |
14:58:59.55 |
-26:04:47.6 |
HIP 73339 |
4.51 |
| 2026-07-31 00:00 |
14:58:59.19 |
-26:04:36.2 |
HIP 73339 |
4.70 |
| 2026-07-31 12:00 |
14:58:58.86 |
-26:04:24.9 |
HIP 73339 |
4.89 |
| 2026-08-01 00:00 |
14:58:58.57 |
-26:04:13.8 |
HIP 73339 |
5.07 |
| 2026-08-01 12:00 |
14:58:58.32 |
-26:04:02.8 |
HIP 73339 |
5.25 |
| 2026-08-02 00:00 |
14:58:58.10 |
-26:03:52.0 |
HIP 73339 |
5.42 |
| 2026-08-02 12:00 |
14:58:57.91 |
-26:03:41.2 |
HIP 73339 |
5.59 |
| 2026-08-03 00:00 |
14:58:57.76 |
-26:03:30.6 |
HIP 73339 |
5.75 |
| 2026-08-03 12:00 |
14:58:57.64 |
-26:03:20.2 |
HIP 73339 |
5.91 |
| 2026-08-04 00:00 |
14:58:57.56 |
-26:03:09.8 |
HIP 73339 |
6.06 |
| 2026-08-04 12:00 |
14:58:57.51 |
-26:02:59.6 |
HIP 73339 |
6.20 |
| 2026-08-05 00:00 |
14:58:57.50 |
-26:02:49.5 |
HIP 73339 |
6.34 |
| 2026-08-05 12:00 |
14:58:57.52 |
-26:02:39.6 |
HIP 73339 |
6.48 |
| 2026-08-06 00:00 |
14:58:57.58 |
-26:02:29.8 |
HIP 73339 |
6.61 |
| 2026-08-06 12:00 |
14:58:57.67 |
-26:02:20.2 |
HIP 73339 |
6.74 |
| 2026-08-07 00:00 |
14:58:57.80 |
-26:02:10.6 |
HIP 73339 |
6.86 |
| 2026-08-07 12:00 |
14:58:57.96 |
-26:02:01.2 |
HIP 73339 |
6.98 |
| 2026-08-08 00:00 |
14:58:58.16 |
-26:01:52.0 |
HIP 73339 |
7.09 |
| 2026-08-08 12:00 |
14:58:58.39 |
-26:01:42.9 |
HIP 73339 |
7.20 |
| 2026-08-09 00:00 |
14:58:58.65 |
-26:01:33.9 |
HIP 73339 |
7.31 |
| 2026-08-09 12:00 |
14:58:58.96 |
-26:01:25.1 |
HIP 73339 |
7.41 |
| 2026-08-10 00:00 |
14:58:59.29 |
-26:01:16.4 |
HIP 73339 |
7.51 |
| 2026-08-10 12:00 |
14:58:59.66 |
-26:01:07.9 |
HIP 73339 |
7.61 |
| 2026-08-11 00:00 |
14:59:00.07 |
-26:00:59.5 |
HIP 73339 |
7.70 |
| 2026-08-11 12:00 |
14:59:00.51 |
-26:00:51.2 |
HIP 73339 |
7.79 |
| 2026-08-12 00:00 |
14:59:00.98 |
-26:00:43.1 |
HIP 73339 |
7.88 |
| 2026-08-12 12:00 |
14:59:01.49 |
-26:00:35.1 |
HIP 73339 |
7.97 |
| 2026-08-13 00:00 |
14:59:02.04 |
-26:00:27.3 |
HIP 73339 |
8.05 |
| 2026-08-13 12:00 |
14:59:02.62 |
-26:00:19.6 |
HIP 73339 |
8.13 |
| 2026-08-14 00:00 |
14:59:03.23 |
-26:00:12.1 |
HIP 73339 |
8.22 |
| 2026-08-14 12:00 |
14:59:03.88 |
-26:00:04.7 |
HIP 73339 |
8.30 |
| 2026-08-15 00:00 |
14:59:04.56 |
-25:59:57.5 |
HIP 73339 |
8.38 |
| 2026-08-15 12:00 |
14:59:05.28 |
-25:59:50.4 |
HIP 73339 |
8.46 |
| 2026-08-16 00:00 |
14:59:06.03 |
-25:59:43.4 |
HIP 73339 |
8.54 |
| 2026-08-16 12:00 |
14:59:06.82 |
-25:59:36.6 |
HIP 73339 |
8.62 |
| 2026-08-17 00:00 |
14:59:07.64 |
-25:59:30.0 |
HIP 73339 |
8.70 |
| 2026-08-17 12:00 |
14:59:08.49 |
-25:59:23.5 |
HIP 73339 |
8.78 |
| 2026-08-18 00:00 |
14:59:09.38 |
-25:59:17.1 |
HIP 73339 |
8.87 |
| 2026-08-18 12:00 |
14:59:10.31 |
-25:59:10.9 |
HIP 73339 |
8.95 |
| 2026-08-19 00:00 |
14:59:11.26 |
-25:59:04.9 |
HIP 73339 |
9.04 |